ZFIRE: SIMILAR STELLAR GROWTH IN H-EMITTING CLUSTER AND FIELD GALAXIES AT z 2
Academic Article
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
ABSTRACTWe compare galaxy scaling relations as a function of environment at with our ZFIRE survey12 where we have measured H fluxes for 90 star-forming galaxies selected from a mass-limited () sample based on ZFOURGE.13 The cluster galaxies (37) are part of a confirmed system at z=2.095 and the field galaxies (53) are at all are in the COSMOS legacy field. There is no statistical difference between H-emitting cluster and field populations when comparing their star formation rate (SFR), stellar mass (), galaxy size (), SFR surface density (( m{H}}{alpha }_{mathrm{star}}$?> )), and stellar age distributions. The only difference is that at fixed stellar mass, the H-emitting cluster galaxies are () 0.1 larger than in the field. Approximately 19% of the H emitters in the cluster and 26% in the field are IR-luminous ( > 21011). Because the luminous IR galaxies in our combined sample are 5 times more massive than the low-IR galaxies, their radii are 70% larger. To track stellar growth, we separate galaxies into those that lie above, on, or below the H star-forming main sequence (SFMS) using SFR()=0.2 dex. Galaxies above the SFMS (starbursts) tend to have higher H SFR surface densities and younger light-weighted stellar ages than galaxies below the SFMS. Our results indicate that starbursts (+SFMS) in the cluster and field at are growing their stellar cores. Lastly, we compare to the (SFR) relation from Rhapsody-G cluster simulations and find that the predicted slope is nominally consistent with the observations. However, the predicted cluster SFRs tend to be too low by a factor of 2, which seems to be a common problem for simulations across environment.
