2015MNRAS.447L..65S

Query : 2015MNRAS.447L..65S

2015MNRAS.447L..65S - Mon. Not. R. Astron. Soc., 447, L65-L69 (2015/February-2)

The reversal of the SF-density relation in a massive, X-ray-selected galaxy cluster at z = 1.58: results from Herschel.

SANTOS J.S., ALTIERI B., VALTCHANOV I., NASTASI A., BOHRINGER H., CRESCI G., ELBAZ D., FASSBENDER R., ROSATI P., TOZZI P. and VERDUGO M.

Abstract (from CDS):

Dusty, star-forming galaxies have a critical role in the formation and evolution of massive galaxies in the Universe. Using deep far-infrared imaging in the range 100-500 µm obtained with the Herschel telescope, we investigate the dust-obscured star formation (SF) in the galaxy cluster XDCP J0044.0-2033 at z = 1.58, the most massive cluster at z > 1.5, with a measured mass M200 = 4.7^+1.4_-0.9x1014 M☉. We perform an analysis of the spectral energy distributions (SEDs) of 12 cluster members (5 spectroscopically confirmed) detected with ≥ 3σ significance in the PACS maps, all ultraluminous infrared galaxies. The individual star formation rates (SFRs) lie in the range 155-824M☉/yr, with dust temperatures of 24-35 K. We measure a strikingly high amount of SF in the cluster core, SFR (<250kpc) ≥ 1875±158M☉/yr, four times higher than the amount of SF in the cluster outskirts. This scenario is unprecedented in a galaxy cluster, showing for the first time a reversal of the SF-density relation at z ∼ 1.6 in a massive cluster.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: clusters: individual: XDCP 0044.0-2033 - galaxies: evolution - galaxies: star formation - infrared: galaxies

Nomenclature: Table 1: [SAV2015] NNN N=12 among (Nos 2-101).

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [SAV2015] 13 G 00 44 00.28 -20 33 54.9           ~ 1 0
2 [SAV2015] 16 G 00 44 00.30 -20 34 18.3           ~ 1 0
3 [SAV2015] 4 G 00 44 00.98 -20 32 39.2           ~ 1 0
4 [SAV2015] 34 G 00 44 02.41 -20 33 21.1           ~ 1 0
5 [SAV2015] 33 G 00 44 03.91 -20 33 46.5           ~ 1 0
6 [SAV2015] 2 G 00 44 04.56 -20 32 26.1           ~ 1 0
7 [SAV2015] 96 G 00 44 04.74 -20 34 09.8           ~ 1 0
8 NAME XMMU J0044.0-2033 ClG 00 44 05.20 -20 33 59.7           ~ 40 0
9 [SAV2015] 92 G 00 44 05.36 -20 33 56.5           ~ 1 0
10 [SAV2015] 95 G 00 44 05.570 -20 34 16.10         21.57 ~ 4 0
11 [SAV2015] 101 G 00 44 05.58 -20 32 58.6           ~ 1 0
12 [SAV2015] 100 G 00 44 05.85 -20 33 17.3           ~ 1 0
13 [SAV2015] 11 G 00 44 06.58 -20 33 35.5           ~ 1 0
14 ClG J0218-0510 ClG 02 18 21.3 -05 10 27           ~ 82 0
15 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 151 0

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