https://scholars.lib.ntu.edu.tw/handle/123456789/624919
標題: | Conditional quenching: A detailed look at the SFR'density relation at z 1/4 0.9 from ORELSE | 作者: | Tomczak A.R Lemaux B.C Lubin L.M Pelliccia D Shen L Gal R.R Hung D Kocevski D.D Le Fèvre O Mei S Rumbaugh N Squires G.K Wu P.-F. PO-FENG WU |
關鍵字: | galaxies: clusters: general; galaxies: evolution; galaxies: groups: general; techniques: photometric; techniques: spectroscopic | 公開日期: | 2019 | 卷: | 484 | 期: | 4 | 起(迄)頁: | 4695-4710 | 來源出版物: | Monthly Notices of the Royal Astronomical Society | 摘要: | We present a study of the star formation rate (SFR)-density relation at z 1/4 0.9 using data drawn from the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey. We find that SFR does depend on environment, but only for intermediate-stellar mass galaxies (10 10.1 < M ∗ /M < 10 10.8) wherein the median SFR at the highest densities is 0.2-0.3 dex less than at lower densities at a significance of 4σ. Galaxies that are more/less massive than this have SFRs that vary at most by approx 20 rm per cent across all environments, but show no statistically significant trend. We further split galaxies into low-redshift (z 1/4 0.8) and high-redshift (z 1/4 1.05) subsamples and observe nearly identical behaviour. We devise a simple toy model to explore possible star formation histories for galaxies evolving between these redshifts. The key assumption in this model is that star-forming galaxies in a given environment-stellar mass bin can be described as a superposition of two exponential time-scales (SFR ' e 't/'.,): a long''., time-scale with '., = 4 Gyr to simulate 'normal' star-forming galaxies, and a short-'., time-scale with free '., (between 0.3 ≤ '.,/Gyr ≤ 2) to simulate galaxies on a quenching trajectory. In general, we find that galaxies residing in low/high environmental densities are more heavily weighted to the long-'.,/short-'., pathways, respectively, which we argue is a signature of environmental quenching. Furthermore, for intermediate-stellar mass galaxies this transition begins at intermediate-density environments suggesting that environmental quenching is relevant in group-like haloes and/or cluster infall regions. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062261028&doi=10.1093%2fmnras%2fstz342&partnerID=40&md5=3ca1c90c82185655b3aaa7a7dae5c714 https://scholars.lib.ntu.edu.tw/handle/123456789/624919 |
ISSN: | 00358711 | DOI: | 10.1093/mnras/stz342 | SDG/關鍵字: | Quenching; Stars; Time measurement; Galaxies: clusters: General; Galaxies: groups: generals; Galaxy evolution; Large-scales; Red shift; Star formation rates; Stellar mass; Techniques: photometric; Techniques: spectroscopic; Time-scales; Galaxies |
顯示於: | 天文物理研究所 |
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