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Satellite content and quenching of star formation in galaxy groups at z ~ 1.8
journal contribution
posted on 2023-06-09, 00:14 authored by Mark Sargent, E Daddi, M Béthermin, M Pannella, A Finoguenov, G Gozaliasl, E Le Floc’h, C Schreiber, V Strazzullo, T Wang, H S Hwang, F Valentino, N Cappelluti, Y Li, G HasingerWe study the properties of satellites in the environment of massive star-forming galaxies at z ~ 1.8 in the COSMOS field, using a sample of 215 galaxies on the main sequence of star formation with an average mass of ~1011M?. At z> 1.5, these galaxies typically trace halos of mass ?1013M?. We use optical-near-infrared photometry to estimate stellar masses and star formation rates (SFR) of centrals and satellites down to ~ 6 × 109M?. We stack data around 215 central galaxies to statistically detect their satellite halos, finding an average of ~3 galaxies in excess of the background density. We fit the radial profiles of satellites with simple ß-models, and compare their integrated properties to model predictions. We find that the total stellar mass of satellites amounts to ~68% of the central galaxy, while spectral energy distribution modeling and far-infrared photometry consistently show their total SFR to be 25-35% of the central's rate. We also see significant variation in the specific SFR of satellites within the halo with, in particular, a sharp decrease at <100 kpc. After considering different potential explanations, we conclude that this is likely an environmental signature of the hot inner halo. This effect can be explained in the first order by a simple free-fall scenario, suggesting that these low-mass environments can shut down star formation in satellites on relatively short timescales of ~0.3 Gyr.
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- Published
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- Published version
Journal
Astronomy and AstrophysicsISSN
0004-6361Publisher
EDP SciencesExternal DOI
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581Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-02-09First Open Access (FOA) Date
2016-02-09First Compliant Deposit (FCD) Date
2016-02-08Usage metrics
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