The SAGA Survey. II. Building a Statistical Sample of Satellite Systems around Milky Way–like Galaxies

We present the Stage II results from the ongoing Satellites Around Galactic Analogs (SAGA) Survey. Upon completion, the SAGA Survey will spectroscopically identify satellite galaxies brighter than M r , o  = −12.3 around 100 Milky Way (MW) analogs at z  ∼ 0.01. In Stage II, we have more than quadrup...

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Bibliographic Details
Published in:The Astrophysical journal 2021-02, Vol.907 (2), p.85
Main Authors: Mao, Yao-Yuan, Geha, Marla, Wechsler, Risa H., Weiner, Benjamin, Tollerud, Erik J., Nadler, Ethan O., Kallivayalil, Nitya
Format: Article
Language:English
Subjects:
Analogs
ASTRONOMY AND ASTROPHYSICS
Astrophysics
Cold dark matter
Dark energy
Dark matter
Dwarf galaxies
Galaxies
Galaxy dark matter halos
Galaxy physics
Luminosity
Luminosity function
Milky Way
Polls & surveys
Quenching
Red shift
Redshift surveys
Satellites
Sky surveys (astronomy)
Star formation
Stars & galaxies
Statistical sampling
Stellar mass
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Summary:We present the Stage II results from the ongoing Satellites Around Galactic Analogs (SAGA) Survey. Upon completion, the SAGA Survey will spectroscopically identify satellite galaxies brighter than M r , o  = −12.3 around 100 Milky Way (MW) analogs at z  ∼ 0.01. In Stage II, we have more than quadrupled the sample size of Stage I, delivering results from 127 satellites around 36 MW analogs with an improved target selection strategy and deep photometric imaging catalogs from the Dark Energy Survey and the Legacy Surveys. We have obtained 25,372 galaxy redshifts, peaking around z  = 0.2. These data significantly increase spectroscopic coverage for very low redshift objects in 17 
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/1538-4357/abce58