Abstract
Abstract We have constructed a catalog of active galactic nuclei (AGNs) with z < 0.13, based on optical spectroscopy, from the parent sample of galaxies in the Six-Degree Field (6dF) galaxy survey (Final Release of 6dFGS), a census of the Southern Hemisphere. This work is an extension of our all-sky AGN catalog in Zaw et al. (ZCF, hereafter). The ZCF is based on 43,533 galaxies with K s ≤ 11.75 (z ≤ 0.09) in the Two Micron All-Sky Survey (2MASS) Redshift Survey (2MRS). The parent catalog of this work, the 6dF catalog, consists of 136,304 publicly available digital spectra for 125,071 galaxies with decl. ≤ 0° and K s ≤ 12.65 (median z = 0.053). Our AGN catalog consists of 3109 broadline AGNs and 12,156 narrowline AGNs which satisfy the 2003 criteria, of which 3865 also satisfy the 2001 criteria. We also provide emission-line widths, fluxes, flux errors, and signal-to-noise ratios of all the galaxies in our spectroscopic sample, allowing users to customize the selection criteria. In addition, we provide the AGN likelihood for the rest of galaxies based on the availability and quality of their spectra. These likelihood values can be used for rigorous statistical analyses.
Highlights
A complete census of active galactic nuclei (AGNs) is important for understanding the growth of supermassive black holes (SMBHs) and the co-evolution of SMBHs and their host galaxies via AGN feedback
This work is an extension of the (Zaw et al 2019, ZCF, here after) all-sky, optical AGN catalog identified from the parent sample of 2MASS Redishift Survey (Huchra et al 2012, 2MASS Redshift Survey (2MRS), here after) galaxy catalog, which contained 6dF galaxies with Ks ≤ 11.75
In the online version of our catalog, we provide extended information for the identified AGNs, namely the full wavelength at half maximum (FWHM) and flux of the broad Hα line, fluxes, and flux errors of the narrow lines used in AGN identification, and the (S/N)line for each line
Summary
A complete census of active galactic nuclei (AGNs) is important for understanding the growth of supermassive black holes (SMBHs) and the co-evolution of SMBHs and their host galaxies via AGN feedback. While deep surveys have the highest number of AGNs, nearby, all-sky catalogs are important for understanding the low redshift universe. Our catalog can contribute to these studies, especially when compared with AGN catalogs from future X-ray telescopes, such as eROSITA1, Athena, Lynx, and XARM4, and Far-IR-radio surveys such as ALMA5 and OST6. We have identified AGNs, using optical line ratios, from the Final Release of the 6dF Galaxy Survey (6dFGS, Jones et al 2004, 2009), a census of nearby galaxies in the Southern hemisphere with Dec ≤ 0◦ and Ks ≤ 12.65. This work is an extension of the (Zaw et al 2019, ZCF, here after) all-sky, optical AGN catalog identified from the parent sample of 2MASS Redishift Survey (Huchra et al 2012, 2MRS, here after) galaxy catalog, which contained 6dF galaxies with Ks ≤ 11.75.
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