Order Catalogs Research Articles

ZTF SN Ia DR2: Impact of the galaxy cluster environment on the stretch distribution of Type Ia supernovae

Understanding the impact of the astrophysical environment on Type Ia supernova (SN Ia) properties is crucial to minimize systematic uncertainties in cosmological analyses based on this probe. We investigate the dependence of the SN Ia SALT2.4 light-curve stretch on the distance from their nearest galaxy cluster to study the potential effect of the intracluster medium (ICM) environment on the intrinsic properties of SN Ia. We used the largest SN Ia sample to date and cross-matched it with existing X-ray, Sunyaev-Zel'dovich, and optical cluster catalogs in order to study the relation between the stretch and the distance to the nearest detected cluster from each SN Ia. We modeled the underlying stretch distribution with a Gaussian mixture with relative amplitudes that depended on redshift and clustercentric distance. We find that the fit quality of the stretch distribution improves significantly when we included the distance-dependant term in the model with a variation of the Akaike information criterion $ AIC = -10.2$. Because of the known correlation between galaxy age and distance from the cluster center, this supports previous evidence that the age of the stellar population is the underlying driver of the bimodal shape of the SN Ia stretch distribution. We further computed the evolution of the fraction of quenched galaxies as a function of distance with respect to cluster center from our best-fit model of the SNe Ia stretch distribution and compared it to previous results obtained from $H line measurements, optical broadband photometry, and simulations. We find our estimate to be compatible with these results. The results of this work indicate that SNe Ia searches at high redshift targeted toward clusters to maximize detection probability should be considered with caution as the stretch distribution of the detected sample would be strongly biased toward the old subpopulation of SNe Ia. Furthermore, the effect of the ICM environment on the SN Ia properties appears to be significant from the center of the clusters up to their splashback radius. This is compatible with previous works based on observations and simulations of a galaxy age gradient with respect to clustercentric distance in massive cluster halos. The next generation of large-area surveys will provide an increase of an order of magnitude in the size of SN Ia and cluster catalogs. This will enable us to analyze the impact of cluster mass on the intrinsic properties of SNe Ia and of the fraction of quenched galaxies in the outskirts of clusters in more detail, where direct measurements are challenging.

Aphids of Iran: their host plants and distribution

A reviewed checklist of aphids (Hemiptera: Sternorrhyncha: Aphidomorpha) species recorded in Iran is presented as a catalogue in alphabetical order considering recent taxonomic changes. In total, 572 species along with 29 subspecies within 148 genera, belonging to 13 subfamilies, 3 families and 3 superfamilies of Aphidomorpha are presented. In addition, the list of host plants and distribution of the aphid species in Iran and the related references are provided.

Electronic medical record redesign to improve patient safety and use of non-medication orders by clinicians

Background: Electronic medical records (EMRs) have become highly customizable. Although customization allows changes for workflow optimization, such changes can result in a less standardized system and create barriers due to individual preferences. Aim: This was a documentation of the efforts of a greenfield academic medical centre in Qatar to improve patient safety, physician operational efficiency and revenue capture by standardizing the design of the non-medication orders and associated revenue of the EMR . Methods: A multi-disciplinary group reviewed and revamped the design and workflow for non-medication orders, including redistributing orders into order catalogues, standardizing their naming, assigning them billing codes, and reviewing other order details. Measurement of project performance followed cross-sectional and prospective cohort designs. Results: The redesign improved clinicians’ satisfaction with the EMR and reduced patient safety incidents and other technical issues. Improvements in the organization’s operations and staff performance were noticeable across multiple areas. The proportion of clinicians finding it difficult to navigate and select orders reduced from 31% to 21%. The proportion of clinicians who believed the orders to be clear and accurate increased from about 16% to 31%. The estimated percentage of clinicians reporting a technical issue with an order during the last month reduced from 52% to 41.94%, and physicians’ dissatisfaction with the overall organization of non-medication orders in the EMR reduced from about 32% to 23%. The average number of technical issues and change requests sent monthly to the technology team for non-medication orders reduced from 30 to 1.4 technical issues and 3.2 change requests. Conclusion: EMR performance improvement projects that consider and address staff input, patient safety and performance metrics can uplift an organization’s clinical and financial performance.

A morphological segmentation approach to determining bar lengths

ABSTRACT Bars are important drivers of galaxy evolution, influencing many physical processes and properties. Characterizing bars is a difficult task, especially in large-scale surveys. In this work, we propose a novel morphological segmentation technique for determining bar lengths based on deep learning. We develop U-Nets capable of decomposing galaxy images into pixel masks highlighting the regions corresponding to bars and spiral arms. We demonstrate the versatility of this technique through applying our models to galaxy images from two different observational data sets with different source imagery, and to RGB colour and monochromatic galaxy imaging. We apply our models to analyse SDSS and Subaru HyperSuprime Cam imaging of barred galaxies from the NA10 and Sydney AAO Multi-object IFS catalogues in order to determine the dependence of bar length on stellar mass, morphology, redshift and the spin parameter proxy $\lambda _{R_e}$. Based on the predicted bar masks, we show that the relative bar scale length varies with morphology, with early type galaxies hosting longer bars. While bars are longer in more massive galaxies in absolute terms, relative to the galaxy disc they are actually shorter. We also find that the normalized bar length decreases with increasing redshift, with bars in early type galaxies exhibiting the strongest rate of decline. We show that it is possible to distinguish spiral arms and bars in monochrome imaging, although for a given galaxy the estimated length in monochrome tends to be longer than in colour imaging. Our morphological segmentation technique can be efficiently applied to study bars in large-scale surveys and even in cosmological simulations.

Parasitoid flies (Diptera, Tachinidae) in true crickets (Orthoptera, Grylloidea): New host records from Brazil, identification key to parasitoids, and revision of host-parasitoid interactions

True crickets (Orthoptera, Grylloidea) are often parasitized by tachinid flies (Diptera, Tachinidae). However, the diversity of these parasitoids and their oviposition strategies remain unclear. Although some flies are specialized in locating crickets by their calling songs, such as the phonotactic fly Ormia ochracea (Bigot, 1889), a large portion of the tachinids that attack true crickets show different host search strategies and are adapted to parasitize other orthopteroid insects as well. However, these parasitoids have a complex and challenging taxonomy that precludes further improvement in the understanding of Tachinidae-Orthoptera interactions. Here, we described and illustrated seven new host records in Gryllidae and Phalangopsidae species from Brazil, including notes on the diagnostic characters of each parasitoid and host. An illustrated identification key to Tachinidae genera recorded in Grylloidea is also provided. Finally, all published records of Tachinidae parasitism in true crickets were revised and are presented in an annotated catalog in order to understand the host range and different oviposition strategies of each parasitoid lineage.

In “the Finest Australian Wool”: Foy & Gibson’s Healthy, Comfortable, Wool-Clad Bodies, 1900–1939

ABSTRACT From the late 19th century, when the Melbourne manufacturer and department store Foy & Gibson began to produce mail order catalogues for country customers, it recognised the potential to sell clothing made of Australian wool. This article explores how Foy & Gibson influenced consumer attitudes towards the natural fibre by encouraging them to feel wool as a next-to-the-skin experience. By focusing on underwear and swimsuits in the catalogues across the first three decades of the 20th century, it offers a historical counterpoint to promotional activities that continue into the present urging consumers to understand the benefits of wearing wool.

GaiaData Release 3

Context.In current astronomical surveys with ever-increasing data volumes, automated methods are essential. Objects of known classes from the literature are necessary to train supervised machine-learning algorithms and to verify and validate their results.Aims.The primary goal of this work is to provide a comprehensive data set of known variable objects from the literature that we cross-match withGaiaDR3 sources, including a large number of variability types and representatives, in order to cover sky regions and magnitude ranges relevant to each class in the best way. In addition, non-variable objects from selected surveys are targeted to probe their variability inGaiaand possible use as standards. This data set can be the base for a training set that can be applied to variability detection, classification, and validation.Methods.A statistical method that employed astrometry (position and proper motion) and photometry (mean magnitude) was applied to selected literature catalogues in order to identify the correct counterparts of known objects in theGaiadata. The cross-match strategy was adapted to the properties of each catalogue, and the verification of results excluded dubious matches.Results.Our catalogue gathers 7 841 723Gaiasources, 1.2 million of which are non-variable objects and 1.7 million are galaxies, in addition to 4.9 million variable sources. This represents over 100 variability (sub)types.Conclusions.This data set served the requirements of theGaiavariability pipeline for its third data release (DR3) from classifier training to result validation, and it is expected to be a useful resource for the scientific community that is interested in the analysis of variability in theGaiadata and other surveys.

The Hi in Ring Galaxies Survey (Hi-RINGS)—Effects of the bar on the Hi gas in ring galaxies

Abstract We present a new high-resolution neutral atomic hydrogen (Hi) survey of ring galaxies using the Australia Telescope Compact Array (ATCA). We target a sample of 24 ring galaxies from the Buta (1995) Southern Ring Galaxy Survey Catalogue in order to study the origin of resonance-, collisional- and interaction-driven ring galaxies. In this work, we present an overview of the sample and study their global and resolved Hi properties. In addition, we also probe their star formation properties by measuring their star formation rates (SFR) and their resolved SFR surface density profiles. We find that a majority of the barred galaxies in our sample are Hi-deficient, alluding to the effects of the bar in driving their Hi deficiency. Furthermore, for the secularly evolving barred ring galaxies in our sample, we apply Lindblad’s resonance theory to predict the location of the resonance rings and find very good agreement between predictions and observations. We identify rings of Hi gas and/or star formation co-located at one or the other major resonances. Lastly, we measure the bar pattern speed ( $\Omega_{\textrm{bar}}$ ) for a sub-sample of our galaxies and find that the values range from 10–90 $\textrm{km s}^{-1}$ kpc $^{-1}$ , in good agreement with previous studies.

Early Results from GLASS-JWST. II. NIRCam Extragalactic Imaging and Photometric Catalog

We present the reduced images and multiwavelength catalog of the first JWST NIRCam extragalactic observations from the GLASS Early Release Science Program, obtained as coordinated parallels of the NIRISS observations of the Abell 2744 cluster. Images in seven bands (F090W, F115W, F150W, F200W, F277W, F356W, and F444W) have been reduced using an augmented version of the official JWST pipeline; we discuss the procedures adopted to remove or mitigate defects in the raw images. We obtain a multiband catalog by means of forced aperture photometry on point-spread function (PSF)-matched images at the position of F444W-detected sources. The catalog is intended to enable early scientific investigations, and it is optimized for faint galaxies; it contains 6368 sources, with limiting magnitude 29.7 at 5σ in F444W. We release both images and catalog in order to allow the community to become familiar with the JWST NIRCam data and evaluate their merit and limitations given the current level of knowledge of the instrument.

Properties of intra-cluster low-mass X-ray binaries in Fornax globular clusters

Aims. We present a study of the intra-cluster population of low-mass X-ray binaries (LMXB) residing in globular clusters (GC) in the central 1 deg2 of the Fornax galaxy cluster. Differently from previous studies, which were restricted to the innermost regions of individual galaxies, this work is aimed at comparing the properties of the intra-cluster population of GC-LMXBs with those of the host galaxy. Methods. The data used in this work are a combination of the VLT Survey Telescope (VST) and Chandra observations. We performed a cross-match between the optical and the X-ray catalogue in order to identify the LMXBs residing in GCs. We divided the GC-LMXBs into host-galaxy and intra-cluster objects based on their distance from the nearest galaxy in terms of effective radius (Reff). We found 82 intra-cluster GC-LMXBs and 86 objects that are hosted in galaxies. As the formation of LMXBs also depends on the host GC colour, we performed a Gaussian mixture model to divide the population into red and blue GCs. Results. As has been found for the innermost regions of galaxies, LMXBs tend to form in red and bright GCs in intra-cluster space as well. We find, however, that the likelihood of a red GC to host an LMXB decreases with galactocentric distance, but it remains approximately constant for the blue GC population. Investigating the X-ray properties of the LMXBs residing in GCs, we find a difference in the X-ray luminosity function between the intra-cluster and host-galaxy sample: both follow a power-law down to ∼8.5 × 1037 erg s−1, which is consistent with field LMXBs for the intra-cluster sample, while the latter agree with previous estimates for LMXBs in GCs. We observe a deficiency of bright LMXBs in blue intra-cluster GCs, however. This might indicate a lack of black hole binaries in metal-poor systems. We further investigated the spectral properties of the GC-LMXBs through their hardness-ratio. We detect a tentative difference in the hardness ratio of two populations, where the intra-cluster GC-LMXBs appear to have harder spectra than the host-galaxy objects. We find the same trend when we compare red and blue GC-LMXBs: the spectra of the blue sample are harder spectra than those of the red sample. This result could suggest a relation between the spectral properties of LMXBs and the host GC colour and therefore its metallicity. We discuss the possibilities of spatial biases due to uncertainties in the X-ray spectral response correction and due to contamination by background active galactic nuclei.

Spatio-temporal clustering of successive earthquakes as inferred from analyses of global CMT and NIED F-net catalogs

Investigation of the characteristic behavior of successive earthquakes that closely occur in space and time is important to understand the generation mechanism of earthquakes and useful to assess a triggered earthquake, especially around the area, where a first large earthquake took place. Here, we analyzed the Global Centroid Moment Tensor catalog from 1976 to 2016 for shallow earthquakes with a moment magnitude, {M}_{w}, of at least 5.5, and the F-net catalog, Japan, for 4le {M}_{w}<5.5, to clarify the spatio-temporal characteristics of the successive earthquakes. We first sorted all of the earthquakes in time and removed the aftershocks that occurred in and around the faults of earthquakes with {M}_{w} larger than the target magnitude range we investigated. Then, we selected source events from the beginning and searched for earthquakes that occurred within a horizontal distance (D) and a lapsed time ({T}_{a}) from the source event to group them in clusters. Then, the source event was selected from the catalog in order, and the same procedure was repeated. We counted the number of clusters, each of which consisted of successive earthquakes, for different D and {T}_{a}. To examine whether successive earthquakes were explained by random occurrences, we compared the results with simulations in which earthquakes occurred randomly in time but at the same locations matching the centroids in the real data. The comparison showed that the number of clusters for the simulation rapidly increased with D and merged with that for real data at a short distance, which is defined here as the triggering distance. We find that triggering distance is proportional to about 1/5 to 1/4 of the seismic moment {(M}_{0}) of the source event, and exponentially decreases with increasing {T}_{a}. Relating the derived empirical scaling relations between {M}_{0} and triggering distance from the equations in the ETAS model, we show that the observed exponents of 1/5 to 1/4 were well predicted from the estimated ETAS parameters in various regions around the world. These consistencies first show that successive occurrence of earthquakes is well explained by the ETAS model.Graphical abstract

Introducing the World Arachnida Catalog: the new research environment for (almost all) arachnid orders

The World Arachnida Catalog (WAC, online at https://wac.nmbe.ch) is introduced as an amalgamation of the highly successful World Spider Catalog (WSC), the Pseudoscorpions of the World Catalog, and the Smaller Arachnid Order Catalogs. The new catalogs present all available taxonomic information on eight arachnid orders (Amblypygi, Araneae, Pseudoscorpiones, Ricinulei, Palpigradi, Schizomida, Solifugae and Uropygi) in a single location and a standardized format, continuously updated by specialists, to members of the World Spider Catalog Association (WSCA). For the first time, the majority of taxonomic literature for Pseudoscorpiones and the smaller arachnid orders will be available in downloadable PDF format for members according to the Swiss copyright laws. Up-to-date counts of families, genera and species are given alongside the current taxonomy for each taxon. Now in a common place and presented in an almost unified format, the new catalog aims to become the primary repository of taxonomic information for the Arachnida and will hopefully stimulate arachnological research across all arachnid orders by removing boundaries imposed by literature accessibility, incompatibility of formats, or taxonomic jargon.

The Impact of Baryonic Physics on the Abundance, Clustering, and Concentration of Halos

Abstract We examine the impact of baryonic physics on the halo distribution in hydrodynamic simulations compared to that in dark matter–only (DMO) simulations. We find that, in general, DMO simulations produce halo mass functions (HMFs) that are shifted to higher halo masses than their hydrodynamic counterparts due to the lack of baryonic physics. However, the exact nature of this mass shift is a complex function of mass, halo definition, redshift, and larger-scale environment, and it depends on the specifics of the baryonic physics implemented in the simulation. We present fitting formulae for the corrections one would need to apply to each DMO halo catalog in order to reproduce the HMF found in its hydrodynamic counterpart. Additionally, we explore the dependence on environment of this HMF discrepancy and find that, in most cases, halos in low-density environments are slightly more impacted by baryonic physics than halos in high-density environments. We thus also provide environment-dependent mass correction formulae that can reproduce the conditional, as well as global, HMF. We show that our mass corrections also repair the large-scale clustering of halos, though the environment-dependent corrections are required to achieve an accuracy better than 2%. Finally, we examine the impact of baryonic physics on the halo mass–concentration relation and find that its slope in hydrodynamic simulations is consistent with that in DMO simulations. Ultimately, we recommend that any future work relying on DMO halo catalogs incorporate our mass corrections to test the robustness of their results to baryonic effects.

Overdensity of VVV galaxies behind the Galactic bulge

Context. The extragalactic vision we have through the Milky Way is very unclear. There is significant extinction of the optical emission from objects located in the region called the zone of avoidance (ZOA). NIR wavelengths are less affected by extinction, and therefore the infrared surveys in this zone are a potential source of astronomical discoveries. Nevertheless, these observations need to be compared with cosmological simulations in order to carry out high−accuracy studies. Aims. Our aim is to identify extragalactic sources in the ZOA, using infrared images of the VVV survey. We consider mock galaxy catalogues in order to interpret observational results. Methods. We studied a region of 1.636 square degrees corresponding to the VVV tile b204. Using SExtractor, we analysed photometric data generating a catalogue of extended sources in this area. In order to confirm these sources as galaxy candidates we visually inspected RGB images looking for typical galaxy features. Using 2MASX and GCMW catalogued sources we tested completeness and contamination of our catalogue and define suitable colour cuts to select galaxies. We also compared the observational results with those obtained from two semi-analytical models on Dark Matter simulations. One galaxy catalogue was constructed with the SAG semi-analytic model of galaxy formation, and the other one was constructed with the L-Galaxies semi-analytic model. Results. By adopting CLASS_STAR &lt; 0.5, r1/2 &gt; 0.7 arcsec and specific colour cuts (J − Ks &gt; 0.97, J − H &gt; 0 and H − Ks &gt; 0) we generated an automatic catalogue of extended sources. After visual inspection we identified 624 sources with 10 &lt; Ks &lt; 17 as galaxy candidates. The contamination of the automatic catalogue is 28% when considering visually confirmed galaxies as reliable objects. The estimated completeness is 87% up to magnitude Ks = 13.5. We analysed the spatial distribution of galaxy candidates, finding a high concentration of galaxies in a small region of 15 arcmin radius. This region has three times higher density than similar areas in the tile. We compared the number of galaxies in this small area with the mean density values obtained from a suitable sample of galaxies from semi-analytic models finding that our results are consistent with an overdensity region. Conclusions. Using VVV near-infrared data and mock catalogues we detect new extragalactic sources that have not been identified by other catalogues. We demonstrate the potentiality of the VVV survey in finding and studying a large number of galaxy candidates and extragalactic structures obscured by the Milky Way.

Bounds on WIMP dark matter from galaxy clusters at low redshift

Abstract In this work we study the cross-correlation between Fermi-LAT diffuse γ-ray maps and galaxy cluster catalogues in order to search for a diffuse dark matter signal. We employ an accurate estimation of the error covariance matrix and we select 4 galaxy cluster catalogues at low-redshift 0 &amp;lt; z &amp;lt; 0.2 with large-halo mass M500 &amp;gt; 1013M⊙ including infrared, optical and X-rays wavebands. We consider weakly interacting massive particle (WIMP) dark matter with 100% branching ratios into τ+τ−, $b\bar{b}$, W+W− and μ+μ−. No evidence for a WIMP dark matter signal is identified, and we derive competitive bounds. The WIMP thermally averaged cross section is excluded at 95% C.L. for dark matter masses below 20 GeV and annihilation in the τ+τ− channel.

Permittivity estimation of a shallow-layered medium using high-resolution ground-penetrating radar

ABSTRACTThis paper proposes a method of permittivity estimation using ground penetrating radar (GPR). The proposed method can estimate the permittivity of a shallow-layered medium. In the proposed method, antenna calibration is introduced to improve the vertical resolution of the GPR. The conventional surface reflection method is slightly modified to be suitable for operation at a shallow depth since the antenna calibration impacts the signal amplitude being exploited to estimate the permittivity. Simulation and experimentation examples are illustrated to confirm that the proposed method can estimate the permittivity of each layer of dielectric ground medium. Simulations were divided into two main catalogues in order to investigate the resolution improvement and estimation accuracy of the GPR. The experimentation of the GPR along with the proposed method were conducted. The experimental results showed good agreement with those obtained from the commercial dielectric prob kit.

Planimetry of the Monumental of Jaén Kingdom’s “Caudillos” Located in Santisteban del Puerto.

The Ducal Archive of Medinaceli hosts an interesting collection of maps and plans which has recently been catalogued by a team of specialists during the completion of an I+D research project. In the collection, there is a set of plans associated with the Casa de Santisteban del Puerto, the so-called Caudillos mayores (main chieftains) of the Kingdom of Jaen. In this paper, we will be focusing on the most relevant properties in this city: the famous Castle of San Esteban, the Ducal Palace and the Convent of San Francisco. Our research is based on a descriptive methodology on the main urban-planimetric typological characteristics of historical cities, as is the case of Santisteban del Puerto. And its result not only provides the opportunity to make a reflection about the importance of drawing in the world or architecture, but also rectifies some imprecisions concerning this catalogue in order to reach a better understanding of the maps. The importance of the planimetry covered here lies in the fact that the monuments no longer exist.

Fashion, product innovation, and consumer culture in the late 19th century: Alle Città d’Italia department store in Milan

Unlike product invention, product innovation has been overlooked as an issue relevant to the study of the economic, social, and cultural change. It is only in recent times that historians started to explore product innovation in order to understand the origins of consumer society. This article deals with fashion as a kind of product innovation and aims to explain how 19th-century fashion transformed clothing into a product designed and desired primarily for its ever-changing expressive and decorative qualities. The research is based on the mail order catalogs delivered by the Italian department store Alle Città d’Italia in the 1880s. Analysis of this valuable and largely unexplored historical source allowed us to conclude that (1) the innovative nature of 19th-century fashion had mainly to do with the services – ready-to-wear dress and novelty – provided to consumers rather than with the product’s physical components; (2) department stores and haute couture – the sole internationally acknowledged agency of fashioning at the time – both contributed to transform novelty and continuous change into distinctive characteristics of fashion; (3) fashion played a major role in modernizing consumer culture, shifting the focus from material elements to the services inherent in consumer goods.

Optically variable AGN in the three-year VST survey of the COSMOS field

Context. The analysis of the variability of active galactic nuclei (AGN) at different wavelengths and the study of possible correlations of different spectral windows are a current main field of inquiry. Optical variability has been largely used to identify AGN in multivisit surveys. The strength of a selection based on optical variability lies in the opportunity of analyzing data from surveys of large sky areas by ground-based telescopes. However, the effectiveness of optical variability selection with respect to other multiwavelength techniques has been poorly studied down to the depth that is expected from next-generation surveys. Aims. Here we present the results of our r-band analysis of a sample of 299 optically variable AGN candidates in the VST survey of the COSMOS field, counting 54 visits spread over three observing seasons spanning more than three years. This dataset is more than three times larger than the dataset presented in our previous analysis, and the observing baseline is about eight times longer. Methods. We push toward deeper magnitudes (r(AB) ∼ 23.5 mag) than were reached in past studies. We made wide use of ancillary multiwavelength catalogs in order to confirm the nature of our AGN candidates, and constrained the accuracy of the method based on spectroscopic and photometric diagnostics. We also performed tests aimed at assessing the relevance of dense sampling in view of future wide-field surveys. Results. We demonstrate that the method allows the selection of high-purity (&gt; 86%) samples. We take advantage of the longer observing baseline to achieve great improvement in the completeness of our sample with respect to X-ray and spectroscopically confirmed samples of AGN (59% vs. ∼15% in our previous work), as well as in the completeness of unobscured and obscured AGN. The effectiveness of the method confirms the importance of developing future more refined techniques for the automated analysis of larger datasets.

A catalog of spectroscopic binary candidate stars derived from a comparison of Gaia DR2 with other radial velocity catalogs

AbstractUsing the recently published Gaia second data release that includes measurements of the mean radial velocity of about 7.2 million stars, we performed a systematic comparison with other existing radial velocity catalogs to search for variations in the radial velocity measurements, with the goal that detected differences may indicate that these stars are possibly spectroscopic binary stars with only one visible component (SB1). We present a catalog of spectroscopic binary candidate stars containing 35,246 stars, compiled to encourage follow‐up observations obtaining spectra at different epochs of orbits of these stars to verify their binarity and to study these systems using radial velocity curves. Comparing the Gaia DR2 database with the K‐M dwarf catalog, we found 16 stars that show radial velocity variations. In a comparison with the Pulkovo radial velocity catalog of Hipparcos stars, we identified a total of 539 SB1 candidate stars. In the largest radial velocity catalog available, the radial velocity experiment (RAVE) catalog, we found a total of 34,691 stars that show radial velocity variations when compared to the Gaia DR2 data.