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18 April 2024 |
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The SAGA Survey. II. Building a Statistical Sample of Satellite Systems around Milky Way-like Galaxies | | Yao-Yuan Mao
; Marla Geha
; Risa H. Wechsler
; Benjamin Weiner
; Erik J. Tollerud
; Ethan O. Nadler
; Nitya Kallivayalil
; | | Date: |
28 Aug 2020 | | Abstract: | 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 one
hundred Milky Way (MW) analogs at $ z sim 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 < r_o < 20.75 $ around SAGA hosts, creating a unique data set
that places the Local Group in a wider context. The number of confirmed
satellites per system ranges from 0 to 9, and correlates with host galaxy
luminosity and brightest satellite luminosity. We find that the number and the
luminosities of MW satellites are consistent with being drawn from the same
underlying distribution as SAGA systems. The majority of confirmed SAGA
satellites are star forming, and the quenching fraction increases as satellite
stellar mass and projected radius from the host galaxy decrease. Overall, the
satellite quenching fraction among SAGA systems is lower than that in the Local
Group. We compare the luminosity functions and radial distributions of SAGA
satellites with theoretical predictions based on Cold Dark Matter simulations
and an empirical galaxy-halo connection model, and find that the results are
broadly in agreement. | | Source: | arXiv, 2008.12783 | | Services: | Forum | Review | PDF | Favorites | |
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