THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ULTRALUMINOUS STAR-FORMING GALAXIES IN A z=1.6 CLUSTER

被引：49

作者：

Smail, Ian ^{[1
]}

Geach, J. E. ^{[2
]}

Swinbank, A. M. ^{[1
]}

Tadaki, K. ^{[3
]}

Arumugam, V. ^{[4
]}

Hartley, W. ^{[5
,6
]}

Almaini, O. ^{[6
]}

Bremer, M. N. ^{[7
]}

Chapin, E. ^{[8
]}

Chapman, S. C. ^{[9
]}

Danielson, A. L. R. ^{[1
]}

Edge, A. C. ^{[1
]}

Scott, D. ^{[10
]}

Simpson, C. J. ^{[11
]}

Simpson, J. M. ^{[1
]}

Conselice, C. ^{[6
]}

Dunlop, J. S. ^{[4
]}

Ivison, R. J. ^{[4
,12
]}

Karim, A. ^{[13
]}

Kodama, T. ^{[14
]}

Mortlock, A. ^{[6
]}

Robson, E. I. ^{[12
]}

Roseboom, I. ^{[4
]}

Thomson, A. P. ^{[1
]}

van der Werf, P. P. ^{[15
]}

Webb, T. M. A. ^{[16
]}

机构：

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

[2] Univ Hertfordshire, Sci & Technol Res Inst, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[3] Natl Astron Observ, Mitaka, Tokyo 181, Japan

[4] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[5] Swiss Fed Inst Technol, Inst Astron, CH-8093 Zurich, Switzerland

[6] Univ Nottingham, Sch Phys & Astron, Nottingham NG9 2RD, England

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

[8] ESAC, XMM SOC, E-28691 Madrid, Spain

[9] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 4R2, Canada

[10] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T IZ1, Canada

[11] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[12] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland

[13] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany

[14] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[15] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[16] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 782卷 / 01期

基金：

加拿大创新基金会;

关键词：

cosmology: observations; galaxies: clusters: individual (Cl0218.3-0510); galaxies: evolution; galaxies: formation; DEEP-FIELD-SOUTH; PANORAMIC H-ALPHA; RED-SEQUENCE; SUBMILLIMETER GALAXIES; EXTRAGALACTIC SURVEY; MIDINFRARED COUNTERPARTS; LUMINOSITY FUNCTION; BOLOMETER CAMERA; DISTANT CLUSTERS; BILLION YEARS;

D O I：

10.1088/0004-637X/782/1/19

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze new SCUBA-2 submillimeter and archival SPIRE far-infrared imaging of a z = 1.62 cluster, Cl 0218.3-0510, which lies in the UKIRT Infrared Deep Sky Survey/Ultra-Deep Survey field of the SCUBA-2 Cosmology Legacy Survey. Combining these tracers of obscured star-formation activity with the extensive photometric and spectroscopic information available for this field, we identify 31 far-infrared/submillimeter-detected probable cluster members with bolometric luminosities greater than or similar to 10(12) L-circle dot and show that by virtue of their dust content and activity, these represent some of the reddest and brightest galaxies in this structure. We exploit ALMA submillimeter continuum observations, which cover one of these sources, to confirm the identification of a SCUBA-2-detected ultraluminous star-forming galaxy in this structure. Integrating the total star-formation activity in the central region of the structure, we estimate that it is an order of magnitude higher (in a mass-normalized sense) than clusters at z similar to 0.5-1. However, we also find that the most active cluster members do not reside in the densest regions of the structure, which instead host a population of passive and massive, red galaxies. We suggest that while the passive and active populations have comparable near-infrared luminosities at z = 1.6, M-H similar to -23, the subsequent stronger fading of the more active galaxies means that they will evolve into passive systems at the present day that are less luminous than the descendants of those galaxies that were already passive at z similar to 1.6 (M-H similar to -20.5 and M-H similar to -21.5, respectively, at z similar to 0). We conclude that the massive galaxy population in the dense cores of present-day clusters were already in place at z = 1.6 and that in Cl 0218.3-0510 we are seeing continuing infall of less extreme, but still ultraluminous, star-forming galaxies onto a pre-existing structure.

引用

页数：15

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