2012A&A...540A..45P


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.15CET12:39:06

2012A&A...540A..45P - Astronomy and Astrophysics, volume 540A, 45-45 (2012/4-1)

First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND. The galaxy population of XMMU J0338.7+0030 at z = 1.1.

PIERINI D., SUHADA R., FASSBENDER R., NASTASI A., BOEHRINGER H., SALVATO M., PRATT G.W., LERCHSTER M., ROSATI P., SANTOS J.S., DE HOON A., KOHNERT J., LAMER G., MOHR J.J., MUEHLEGGER M., QUINTANA H., SCHWOPE A., BIFFI V., CHON G., GIODINI S., KOPPENHOEFER J., VERDUGO M., ZIPARO F., AFONSO P.M.J., CLEMENS C., GREINER J., KRUEHLER T., KUEPCUE YOLDAS A., OLIVARES E.F., ROSSI A. and YOLDAS A.

Abstract (from CDS):

The XMM-Newton Distant Cluster Project is a serendipitous survey for clusters of galaxies at redshifts z≥0.8 based on deep archival XMM-Newton observations. X-ray sources identified as extended are screened against existing optical all-sky surveys for galaxies, in case of candidate high-z clusters followed up with imaging at 4m-class telescopes and, ultimately, multi-object spectroscopy at 8 m-class telescopes. Low-significance candidate high-z clusters are followed up with the seven-channel imager GROND (Gamma-Ray Burst Optical and Near-Infrared Detector) that is mounted at a 2 m-class telescope. Its unique capability of simultaneous imaging in the g', r', i', z', J, H, Ks bands enables the use of the photometric redshift technique. Observing strategy, data reduction and analysis, depth and accuracy of the simultaneous multi-wavelength photometry are discussed with the goal of establishing GROND as a useful instrument to confirm X-ray selected (high-z) clusters.The test case is XMMUJ0338.7+0030, suggested to be at z∼1.45±0.15 (1σ) from the analysis of the z-H vs. H colour-magnitude diagram obtained from the follow-up imaging. Later VLT-FORS2 spectroscopy enabled us to identify four members, which set this cluster at z=1.097±0.002 (1σ). To reach a better knowledge of its galaxy population, we observed XMMUJ0338.7+0030 with GROND for about 6h. The publicly available photo-z code le Phare was used. The Ks-band number counts of the non-stellar sources out of the 832 detected down to z'∼26ABmag (1σ) in the 3.9x4.3-arcmin2 region of XMMUJ0338.7+0030 imaged at all GROND bands clearly exceed those computed in deep fields/survey areas at ∼20.5-22.5ABmag. The photo-z's of the three imaged spectroscopic members yield z=1.12±0.09 (1σ). The spatial distribution and the properties of the GROND sources with a photo-z in the range 1.01-1.23 confirm the correspondence of the X-ray source with a galaxy over-density at a significance of at least 4.3σ. Candidate members that are spectro-photometrically classified as elliptical galaxies define a red locus in the i'-z' vs. z' colour-magnitude diagram that is consistent with the red sequence of the cluster RDCSJ0910+5422 at z=1.106. XMMUJ0338.7+0030 hosts also a population of bluer late-type spirals and irregulars. The starbursts among the photometric members populate both loci, consistently with previous results. The analysis of the available data set indicates that XMMUJ0338.7+0030 is a low-mass cluster (M200∼1014M) at z=1.1. With the photometric accuracy yielded by the present unoptimized multi-band observations with GROND, we not only confirm the spectroscopic redshift of this cluster but also show that it hosts a galaxy population that can still undergo significant bursts of star-formation activity.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies: clusters - galaxies: distances and redshifts - galaxies: clusters: general - galaxies: high-redshift

Nomenclature: XDCP J0338.7+0030 N=1. Table 1: [PSF2012] NN N=4.

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME XMMU J0044.0-2033 ClG 00 44 05.20 -20 33 59.7           ~ 29 0
2 NAME XMMU J0302.2-0001 ClG 03 02 11.90 -00 01 34.3           ~ 6 0
3 ClG J0332-2742 ClG 03 32 29.280 -27 42 35.99           ~ 13 0
4 QSO J0338+0021 QSO 03 38 29.3152522955 +00 21 56.242586538   25.10 23.26     ~ 85 0
5 XDCP J0338.5+0029 ClG 03 38 30.0 +00 29 00           ~ 1 0
6 [PSF2012] 15 G 03 38 40.912 +00 30 10.66           ~ 1 0
7 [PSF2012] 12 G 03 38 43.026 +00 32 18.55           ~ 1 0
8 [PSF2012] 2 G 03 38 44.136 +00 30 29.95           ~ 1 0
9 NAME XMMU J0338.7+0030 ClG 03 38 44.20 +00 30 01.8           ~ 2 0
10 [PSF2012] 16 G 03 38 44.299 +00 30 03.71           ~ 1 0
11 NAME XMMU J0338.8+0021 ClG 03 38.8 +00 21           ~ 3 0
12 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 84 0
13 NAME M 81 Triplet GrG 09 56.0 +69 00           ~ 16 1
14 NAME XMMU J1007.4+1237 ClG 10 07 21.60 +12 37 54.3           ~ 8 0
15 XMMU J100750.5+125818 ClG 10 07 50.50 +12 58 18.1           ~ 4 0
16 NAME XMMU J1229.4+0151 ClG 12 29 28.8 +01 51 34           ~ 23 0
17 XDCP J1230.3+1339 ClG 12 30.3 +13 39           ~ 16 0
18 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1809 1
19 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 150 0
20 NAME Subaru Deep Field NGP reg 13 24 21.3 +27 29 23           ~ 293 1
21 NAME XMMU J1532.2-0836 ClG 15 32 13.00 -08 36 56.9           ~ 2 0
22 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 135 0
23 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 374 1
24 NAME Local Group GrG ~ ~           ~ 6679 0

    Equat.    Gal    SGal    Ecl

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2019.11.15-12:39:06

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