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THE DISTRIBUTION OF SATELLITES AROUND MASSIVE GALAXIES AT 1 < z < 3 IN ZFOURGE/CANDELS: DEPENDENCE ON STAR FORMATION ACTIVITY

2014; IOP Publishing; Volume: 792; Issue: 2 Linguagem: Inglês

10.1088/0004-637x/792/2/103

1538-4357

Lalitwadee Kawinwanichakij, Casey Papovich, Ryan Quadri, Kim‐Vy Tran, Lee R. Spitler, Glenn G. Kacprzak, Ivo Labbé, Caroline M. S. Straatman, Karl Glazebrook, Rebecca Allen, Michael J. Cowley, Romeel Davé, Avishai Dekel, Henry C. Ferguson, W. G. Hartley, Anton M. Koekemoer, David C. Koo, Yu Lu, Nicola Mehrtens, Themiya Nanayakkara, S. E. Persson, Glen A. Rees, Brett Salmon, Vithal Tilvi, Adam Tomczak, Pieter van Dokkum,

Stellar, planetary, and galactic studies

We study the statistical distribution of satellites around star-forming and quiescent central galaxies at 1<z 9$ at z 10.78$, have $\sim$2 times the number of satellites compared to star-forming centrals with a significance of 2.7$\sigma$ even after accounting for differences in the centrals' stellar-mass distributions. We find no statistical difference in the satellite distributions of intermediate-mass quiescent and star-forming centrals, $10.48<\log(M/M_\odot)<10.78$. Comparing to the Guo2011 semi-analytic model, the excess number of satellites indicates that quiescent centrals have halo masses 0.3 dex larger than star-forming centrals, even when the stellar-mass distributions are fixed. We use a simple toy model that relates halo mass and quenching, which roughly reproduces the observed quenched fractions and the differences in halo mass between star-forming and quenched galaxies only if galaxies have a quenching probability that increases with halo mass from $\sim$0 for $\log(M_h/M_\odot)\sim$11 to $\sim$1 for $\log(M_h/M_\odot)\sim$13.5. A single halo-mass quenching threshold is unable to reproduce the quiescent fraction and satellite distribution of centrals. Therefore, while halo quenching may be an important mechanism, it is unlikely to be the only factor driving quenching. It remains unclear why a high fraction of centrals remain star-forming even in relatively massive halos.