Abstract
Abstract This paper documents the 16th data release (DR16) from the Sloan Digital Sky Surveys (SDSS), the fourth and penultimate from the fourth phase (SDSS-IV). This is the first release of data from the Southern Hemisphere survey of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new data from APOGEE-2 North are also included. DR16 is also notable as the final data release for the main cosmological program of the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), and all raw and reduced spectra from that project are released here. DR16 also includes all the data from the Time Domain Spectroscopic Survey and new data from the SPectroscopic IDentification of ERosita Survey programs, both of which were co-observed on eBOSS plates. DR16 has no new data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey (or the MaNGA Stellar Library “MaStar”). We also preview future SDSS-V operations (due to start in 2020), and summarize plans for the final SDSS-IV data release (DR17).
Highlights
The Sloan Digital Sky Surveys (SDSS) have been observing the skies from Apache Point Observatory (APO) since 1998(using the 2.5 m Sloan Foundation Telescope; Gunn et al.2006) and from Las Campanas Observatory (LCO) since 2017(using the du Pont 2.5 m Telescope).Representing the fourth phase of the SDSS, SDSS-IV (Blanton et al 2017) consists of three main surveys: the Extended Baryon Oscillation Spectroscopic Survey, Mapping Nearby Galaxies at APO (MaNGA; Bundy et al 2015), and the APO Galactic EvolutionExperiment 2 (APOGEE-2; Majewski et al 2017)
This number includes spectra observed as part of the TimeDomain Spectroscopic Survey (TDSS) and SPectroscopic IDentification of ERosita Sources (SPIDERS) sub-surveys, as well as the spectra taken as part of the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) reverberation mapping (RM) ancillary program
The measurements performed with LRG, ELG, and z < 2.2 quasars will be performed in configuration space and Fourier space
Summary
The Sloan Digital Sky Surveys (SDSS) have been observing the skies from Apache Point Observatory (APO) since 1998. Domain Spectroscopic Survey (TDSS; Morganson et al 2015) These programs have investigated a broad range of cosmological scales, including cosmology with large-scale structure (LSS) in eBOSS, the population of variable quasars and stars with TDSS and X-ray detected active galactic nuclei (AGNs) and stars with SPIDERS, nearby galaxies in MaNGA, and the. This paper documents the 16th data release from the SDSS (DR16), the latest in a series that began in 2001 (Stoughton et al 2002). DR16 represents the full release of the TDSS subprogram, which in total releases spectra for 131,552 variable sources (see Section 5.4). MaNGA or MaStar (Yan et al 2019) in DR16; a number of new or updated VACs based on DR15 MaNGA data are released (see Section 6).
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