The Galaxy End Sequence

被引：59

作者：

Eales, Stephen ^{[1
]}

de Vis, Pieter ^{[2
]}

Smith, Matthew W. L. ^{[1
]}

Appah, Kiran ^{[1
]}

Ciesla, Laure ^{[3
]}

Duffield, Chris ^{[1
]}

Schofield, Simon ^{[1
]}

机构：

[1] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, Wales

[2] Univ Ghent, Steward Observ, Krijgslaan 281 S9, B-9000 Ghent, Belgium

[3] Univ Crete, Dept Phys, Iraklion 71003, Greece

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 465卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

galaxies: evolution; galaxies: spiral; HERSCHEL REFERENCE SURVEY; STAR-FORMATION HISTORY; MOLECULAR GAS FRACTIONS; INITIAL MASS FUNCTION; M-ASTERISK RELATION; ATLAS(3D) PROJECT; MAIN-SEQUENCE; HUBBLE SEQUENCE; FORMING GALAXIES; FORMATION RATES;

D O I：

10.1093/mnras/stw2875

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A common assumption is that galaxies fall in two distinct regions of a plot of specific star formation rate (SSFR) versus galaxy stellarmass: a star-forming galaxy main sequence (GMS) and a separate region of ` passive' or ` red and dead galaxies'. Starting from a volume-limited sample of nearby galaxies designed to contain most of the stellar mass in this volume, and thus representing the end-point of similar or equal to 12 billion years of galaxy evolution, we investigate the distribution of galaxies in this diagram today. We show that galaxies follow a strongly curved extended GMS with a steep negative slope at high galaxy stellar masses. There is a gradual change in the morphologies of the galaxies along this distribution, but there is no clear break between early-type and late-type galaxies. Examining the other evidence that there are two distinct populations, we argue that the ` red sequence' is the result of the colours of galaxies changing very little below a critical value of the SSFR, rather than implying a distinct population of galaxies. Herschel observations, which show at least half of early-type galaxies contain a cool interstellar medium, also imply continuity between early-type and late-type galaxies. This picture of a unitary population of galaxies requires more gradual evolutionary processes than the rapid quenching process needed to explain two distinct populations. We challenge theorists to predict quantitatively the properties of this ` Galaxy End Sequence'.

引用

页码：3125 / 3133

页数：9

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