TY - JOUR
T1 - Satellite quenching and galactic conformity at 0.3 < z < 2.5
AU - Kawinwanichakij, Lalitwadee
AU - Quadri, Ryan F.
AU - Papovich, Casey
AU - Kacprzak, Glenn G.
AU - Labbé, Ivo
AU - Spitler, Lee R.
AU - Straatman, Caroline M S
AU - Tran, Kim Vy H
AU - Allen, Rebecca
AU - Behroozi, Peter
AU - Cowley, Michael
AU - Dekel, Avishai
AU - Glazebrook, Karl
AU - Hartley, W. G.
AU - Kelson, Daniel D.
AU - Koo, David C.
AU - Lee, Seong Kook
AU - Lu, Yu
AU - Nanayakkara, Themiya
AU - Persson, S. Eric
AU - Primack, Joel
AU - Tilvi, Vithal
AU - Tomczak, Adam R.
AU - Van Dokkum, Pieter
PY - 2016/1/20
Y1 - 2016/1/20
N2 - We measure the evolution of the quiescent fraction and quenching efficiency of satellites around star-forming and quiescent central galaxies with stellar mass at . We combine imaging from three deep near-infrared-selected surveys (ZFOURGE/CANDELS, Ultra Deep Survey, and UltraVISTA), which allows us to select a stellar-mass complete sample of satellites with . Satellites for both star-forming and quiescent central galaxies ("centrals") have higher quiescent fractions compared to field galaxies matched in stellar mass at all redshifts. We also observe "galactic conformity": satellites around quiescent centrals are more likely to be quenched compared to the satellites around star-forming centrals. In our sample, this conformity signal is significant at for , whereas it is only weakly significant at and . Therefore, conformity (and thus satellite quenching) has been present for a significant fraction of the age of the universe. The satellite quenching efficiency increases with increasing stellar mass of the central, but does not appear to depend on the stellar mass of the satellite to the mass limit of our sample. When we compare the satellite quenching efficiency of star-forming centrals with stellar masses 0.2 dex higher than quiescent centrals (which should account for any difference in halo mass), the conformity signal decreases, but remains statistically significant at . This is evidence that satellite quenching is connected to the star formation properties of the central galaxy as well as to the mass of the halo. We discuss physical effects that may contribute to galactic conformity, and emphasize that they must allow for continued star formation in the central galaxy even as the satellites are quenched.
AB - We measure the evolution of the quiescent fraction and quenching efficiency of satellites around star-forming and quiescent central galaxies with stellar mass at . We combine imaging from three deep near-infrared-selected surveys (ZFOURGE/CANDELS, Ultra Deep Survey, and UltraVISTA), which allows us to select a stellar-mass complete sample of satellites with . Satellites for both star-forming and quiescent central galaxies ("centrals") have higher quiescent fractions compared to field galaxies matched in stellar mass at all redshifts. We also observe "galactic conformity": satellites around quiescent centrals are more likely to be quenched compared to the satellites around star-forming centrals. In our sample, this conformity signal is significant at for , whereas it is only weakly significant at and . Therefore, conformity (and thus satellite quenching) has been present for a significant fraction of the age of the universe. The satellite quenching efficiency increases with increasing stellar mass of the central, but does not appear to depend on the stellar mass of the satellite to the mass limit of our sample. When we compare the satellite quenching efficiency of star-forming centrals with stellar masses 0.2 dex higher than quiescent centrals (which should account for any difference in halo mass), the conformity signal decreases, but remains statistically significant at . This is evidence that satellite quenching is connected to the star formation properties of the central galaxy as well as to the mass of the halo. We discuss physical effects that may contribute to galactic conformity, and emphasize that they must allow for continued star formation in the central galaxy even as the satellites are quenched.
KW - galaxies: evolution
KW - galaxies: halos
KW - galaxies: high-redshift
KW - galaxies: statistics
UR - http://www.scopus.com/inward/record.url?scp=84955508695&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/FT140100933
U2 - 10.3847/0004-637X/817/1/9
DO - 10.3847/0004-637X/817/1/9
M3 - Article
AN - SCOPUS:84955508695
SN - 0004-637X
VL - 817
SP - 1
EP - 19
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 9
ER -