DUSTY STARBURSTS AND THE FORMATION OF ELLIPTICAL GALAXIES:A SCUBA-2 SURVEY OF A z=1.46 CLUSTER

Ma, C. -J. and Smail, Ian and Swinbank, A. M. and Simpson, J. M. and Thomson, A. P. and Chen, C. -C. and Danielson, A. L. R. and Hilton, M. and Tadaki, K. and Stott, J. P. and Kodama, T. (2015) DUSTY STARBURSTS AND THE FORMATION OF ELLIPTICAL GALAXIES:A SCUBA-2 SURVEY OF A z=1.46 CLUSTER. The Astrophysical Journal, 806 (2). ISSN 0004-637X

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Abstract

We report the results of a deep SCUBA-2 850 and 450 mu m survey for dust-obscured ultra-luminous infrared galaxies (U/LIRGs) in the field of the z = 1.46 cluster XCS J2215.9-1738. We detect a striking overdensity of submillimeter sources coincident with the core of this cluster: similar to 3-4 x higher than expected in a blank field. We use the likely radio and mid-infrared counterparts to show that the bulk of these submillimeter sources have spectroscopic or photometric redshifts that place them in the cluster and that their multiwavelength properties are consistent with this association. The average far-infrared luminosities of these galaxies are (1.0 +/- 0.1) x 10(12) L-circle dot, placing them on the U/LIRG boundary. Using the total star formation occurring in the obscured U/LIRG population within the cluster, we show that the resulting mass-normalized star formation rate for this system supports previous claims of a rapid increase in star formation activity in cluster cores out to z similar to 1.5, which must be associated with the ongoing formation of the early-type galaxies that reside in massive clusters today.

Item Type:
Journal Article
Journal or Publication Title:
The Astrophysical Journal
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
84064
Deposited By:
Deposited On:
17 Jan 2017 16:54
Refereed?:
Yes
Published?:
Published
Last Modified:
08 Jul 2020 06:08