HST/WFC3 grism observations of z ∼ 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers

被引：52

作者：

Matharu, J. ^{[1
]}

Muzzin, A. ^{[2
]}

Brammer, G. B. ^{[3
]}

van der Burg, R. F. J. ^{[4
]}

Auger, M. W. ^{[1
]}

Hewett, P. C. ^{[1
]}

van der Wel, A. ^{[5
,6
]}

van Dokkum, P. ^{[7
]}

Balogh, M. ^{[8
]}

Chan, J. C. C. ^{[9
]}

Demarco, R. ^{[10
]}

Marchesini, D. ^{[11
]}

Nelson, E. J. ^{[12
]}

Noble, A. ^{[13
]}

Wilson, G. ^{[9
]}

Yee, H. K. C. ^{[14
]}

机构：

[1] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[2] York Univ, 4700 Keele St, Toronto, ON M3J 1P3, Canada

[3] Univ Copenhagen, Niels Bohr Inst, Cosm Dawn Ctr, Juliane Maries Vej 30, DK-2100 Copenhagen O, Denmark

[4] European Southern Observ, D-85748 Garching, Germany

[5] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[6] Univ Ghent, Sterrenkundig Observ, Krijgslaan 281 S9, B-9000 Ghent, Belgium

[7] Yale Univ, Dept Astron, 52 Hillhouse Ave, New Haven, CT 06511 USA

[8] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[9] Univ Calif Riverside, Dept Phys & Astron, 900 Univ Ave, Riverside, CA 92521 USA

[10] Univ Concepcion, Dept Astron, Fac Ciencias Fis & Matemat, Concepcion, Chile

[11] Tufts Univ, Dept Phys & Astron, 574 Boston Ave Suites 304, Medford, MA 02155 USA

[12] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[13] MIT, Kavli Inst Astrophys & Space Res, 70 Vassar St, Cambridge, MA 02109 USA

[14] Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 484卷 / 01期

基金：

英国科学技术设施理事会; 新加坡国家研究基金会; 美国国家科学基金会;

关键词：

galaxies: clusters: general; galaxies: evolution; galaxies: high-redshift; galaxies: star formation; galaxies: stellar content; HIGH-REDSHIFT GALAXIES; SPECTROSCOPIC CONFIRMATION; ELLIPTIC GALAXIES; STAR-FORMATION; DISK GALAXIES; EVOLUTION; ENVIRONMENT; SEQUENCE; COMPACT; TRANSFORMATION;

D O I：

10.1093/mnras/sty3465

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Minor mergers are thought to be responsible for the size growth of quiescent field galaxies with decreasing redshift. We test this hypothesis using the cluster environment as a laboratory. Satellite galaxies in clusters move at high velocities, making mergers between them rare. The stellar mass-size relation in 10 clusters and in the field is measured and compared at z similar to 1. Our cluster sample contains 344 spectroscopically confirmed cluster members with Gemini/Gemini Multi-Object Spectrographs and 182 confirmed with Hubble Space Telescope/Wide Field Camera 3 G141 grism spectroscopy. On average, quiescent and star-forming cluster galaxies are smaller than their field counterparts by (0.08 +/- 0.04) and (0.07 +/- 0.01) dex, respectively. These size offsets are consistent with the average sizes of quiescent and star-forming field galaxies between 1.2 <= z <= 1.5, implying the cluster environment has inhibited size growth between this period and z similar to 1. The negligible differences measured between the z similar to 0 field and cluster quiescent mass-size relations in other works imply that the average size of quiescent cluster galaxies must rise with decreasing redshift. Using a toy model, we show that the disappearance of the compact cluster galaxies might be explained if, on average, similar to 40 per cent of them merge with their brightest cluster galaxies (BCGs) and similar to 60 per cent are tidally destroyed into the intracluster light (ICL) between 0 <= z <= 1. This is in agreement with the observed stellar mass growth of BCGs between 0 <= z <= 1 and the observed ICL stellar mass fraction at z similar to 0. Our results support minor mergers as the cause for the size growth in quiescent field galaxies, with cluster-specific processes responsible for the similarity between the field and cluster quiescent mass-size relations at low redshift.

引用

页码：595 / 617

页数：23

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