Star-formation rates of cluster galaxies: nature versus nurture
| Autor: | Tatiana F. Laganá, Melville P. Ulmer |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Stellar mass 010308 nuclear & particles physics Star formation FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Redshift Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Spectral energy distribution 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy cluster |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 475:523-531 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We analyzed 17 galaxy clusters, and investigated, for the first time, the dependence of the SFR and sSFR as a function of projected distance (as a proxy for environment) and stellar mass for cluster galaxies in an intermediate-to-high redshift range ($0.4 < z < 0.9$). We used up to nine flux points (BVRIZYJHKs magnitudes), its errors and redshifts to compute M$_{\rm{star}}$, SFR and sSFR through spectral energy distribution fitting technique. We use a z-dependent sSFR value to distinguish star-forming (SF) from quiescent galaxies. To analyse the SFR and sSFR history we split our sample in two redshift bins: galaxies at $0.4 < z < 0.6$ and $0.6 < z < 0.9$. We separate the effects of environment and stellar mass on galaxies by comparing the properties of star-forming and quiescent galaxies at fixed environment (projected radius) and fixed stellar mass. For the selected spectroscopic sample of more than 500 galaxies, the well-known correlation between SFR and $M_{\rm star}$ is already in place at $z \sim 0.9$, for both SF and quenched galaxies. Our results are consistent with no evidence that SFR (or sSFR) depends on environment, suggesting that for cluster galaxies at an intermediate-to-high redshift range, mass is the primary characteristic that drives SFR. 10 pages, 5 figures |
| Databáze: | OpenAIRE |
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