Early quenching of massive protocluster galaxies around z=2.2 radio galaxies

被引：10

作者：

Husband, K. ^{[1
]}

Bremer, M. N. ^{[1
]}

Stott, J. P. ^{[2
,3
]}

Murphy, D. N. A. ^{[4
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England

[2] Univ Oxford, Dept Phys, Sub Dept Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[3] Univ Durham, Inst Computat Cosmol, S Rd, Durham DH1 3LE, England

[4] Pontificia Univ Catolica Chile, Inst Astrofis, Ave Vicuna Mackenna 4860, Santiago, Chile

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 462卷 / 01期

关键词：

galaxies: clusters: general; galaxies: evolution; galaxies: high-redshift; galaxies: luminosity function; mass function; STAR-FORMING GALAXIES; H-ALPHA EMITTERS; COLOR-MAGNITUDE RELATION; ACTIVE GALACTIC NUCLEI; HIGH-REDSHIFT SURVEY; PROTO-CLUSTER; AGN ACTIVITY; HIZELS; EVOLUTION; IDENTIFICATION;

D O I：

10.1093/mnras/stw1520

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Radio galaxies are among the most massive galaxies in the high-redshift Universe and are known to often lie in protocluster environments. We have studied the fields of seven z = 2.2 radio galaxies with High Acuity Wide field K-band Imager (HAWK-I) narrow-band and broad-band imaging in order to map out their environment using H alpha emitters (HAEs). The results are compared to the blank field HAE survey HiZELS. All of the radio galaxy fields are overdense in HAEs relative to a typical HiZELS field of the same area and four of the seven are richer than all except one of 65 essentially random HiZELS subfields of the same size. The star formation rates of the massive HAEs are lower than those necessary to have formed their stellar population in the preceding Gyr - indicating that these galaxies are likely to have formed the bulk of their stars at higher redshifts, and are starting to quench.

引用

页码：421 / 428

页数：8

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