2011A&A...530A.110S


Query : 2011A&A...530A.110S

2011A&A...530A.110S - Astronomy and Astrophysics, volume 530A, 110-110 (2011/6-1)

Exploring the galaxy cluster-group transition regime at high redshifts. Physical properties of two newly detected z > 1 systems.

SUHADA R., FASSBENDER R., NASTASI A., BOEHRINGER H., DE HOON A., PIERINI D., SANTOS J.S., ROSATI P., MUEHLEGGER M., QUINTANA H., SCHWOPE A.D., LAMER G., KOHNERT J. and PRATT G.W.

Abstract (from CDS):

Multi-wavelength surveys for clusters of galaxies are opening a window on the elusive high-redshift (z>1) cluster population. Well controlled statistical samples of distant clusters will enable us to answer questions about their cosmological context, early assembly phases and the thermodynamical evolution of the intracluster medium. We report on the detection of two z>1 systems, XMMUJ0302.2-0001 and XMMUJ1532.2-0836, as part of the [XMM-Newton Distant Cluster Project (XDCP) sample. We investigate the nature of the sources, measure their spectroscopic redshift and determine their basic physical parameters. The results of the present paper are based on the analysis of [XMM-Newton archival data, optical/near-infrared imaging and deep optical follow-up spectroscopy of the clusters. We confirm the X-ray source XMMUJ0302.2-0001 as a gravitationally bound, bona fide cluster of galaxies at spectroscopic redshift z=1.185. We estimate its M500 mass to (1.6±0.3)x1014M from its measured X-ray luminosity. This ranks the cluster among intermediate mass system. In the case of XMMUJ1532.2-0836 we find the X-ray detection to be coincident with a dynamically bound system of galaxies at z=1.358. Optical spectroscopy reveals the presence of a central active galactic nucleus, which can be a dominant source of the detected X-ray emission from this system. We provide upper limits of X-ray parameters for the system and discuss cluster identification challenges in the high-redshift low-mass cluster regime. A third, intermediate redshift (z=0.647) cluster, XMMUJ0302.1-0000, is serendipitously detected in the same field as XMMUJ0302.2-0001. We provide its analysis as well.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - X-rays: galaxies: clusters - galaxies: evolution

Nomenclature: Text: XDCP JHHMM.m+DDMM (Nos J0302.2-0001, J1532.2-0836). Table 3: [SFN2011] XMMU JHHMM.m+DDMM N (Nos XMMU J0302.2-0001 1 to 6, XMMU J1532.2-0836 1 to 3). Appendix A: [SFN2011] XMMU J0302.1-0000 N=1.

CDS comments: Paragr. 3.3: XMMU J0338.8-0030 is a msiprint for XMMU J0338.7+0030.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 JKCS 41 ClG 02 26 44.0 -04 41 36           ~ 52 0
2 BLOX J0302.0-0000.0 ClG 03 02 05.30 -00 00 05.0           ~ 8 0
3 PB 6981 QSO 03 02 06.7724283048 -00 01 21.250864596   18.44 18.33     ~ 41 0
4 [SFN2011] XMMU J0302.2-0001 5 G 03 02 09.930 -00 01 05.91           ~ 1 0
5 [SFN2011] XMMU J0302.2-0001 2 G 03 02 11.462 -00 01 32.01           ~ 1 0
6 [SFN2011] XMMU J0302.2-0001 4 G 03 02 11.774 -00 01 32.61           ~ 1 0
7 NAME XMMU J0302.2-0001 ClG 03 02 11.90 -00 01 34.3           ~ 6 0
8 [SFN2011] XMMU J0302.2-0001 1 BiC 03 02 12.260 -00 01 33.87           ~ 1 0
9 QSO B0259-0010 QSO 03 02 14.8219677408 +00 01 25.340686536   20.238 19.736   19.033 ~ 27 0
10 [SFN2011] XMMU J0302.2-0001 6 G 03 02 15.228 -00 01 49.87           ~ 1 0
11 [SFN2011] XMMU J0302.2-0001 3 G 03 02 16.181 -00 03 32.28           ~ 1 0
12 NAME XMMU J0338.7+0030 ClG 03 38 44.20 +00 30 01.8           ~ 2 0
13 NAME XMMU J1007.4+1237 ClG 10 07 21.60 +12 37 54.3           ~ 8 0
14 [BCH2008] 146 ClG 10 53 24.78 +57 23 48.2           ~ 6 0
15 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4793 2
16 NAME XMMU J1532.2-0836 ClG 15 32 13.00 -08 36 56.9           ~ 2 0
17 [SFN2011] XMMU J1532.2-0836 3 G 15 32 13.010 -08 36 57.14           ~ 1 0
18 [SFN2011] XMMU J1532.2-0836 2 G 15 32 13.149 -08 36 57.97           ~ 1 0
19 [SFN2011] XMMU J1532.2-0836 1 BiC 15 32 13.294 -08 37 00.75           ~ 1 0
20 V* UZ Lib SB* 15 32 23.2091053080 -08 32 00.933064764   10.12 9.115   7.904 K0III 119 1
21 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 147 0

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