2009A&A...501...49S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST23:16:21

2009A&A...501...49S - Astronomy and Astrophysics, volume 501, 49-60 (2009/7-1)

Multiwavelength observations of a rich galaxy cluster at z ∼ 1. The HST/ACS colour-magnitude diagram.

SANTOS J.S., ROSATI P., GOBAT R., LIDMAN C., DAWSON K., PERLMUTTER S., BOEHRINGER H., BALESTRA I., MULLIS C.R., FASSBENDER R., KOHNERT J., LAMER G., RETTURA A., RITE C. and SCHWOPE A.

Abstract (from CDS):

XMMU J1229+0151 is a rich galaxy cluster with redshift z=0.975 that was serendipitously detected in X-rays within the scope of the XMM-Newton Distant Cluster Project. Both HST/ACS observations in the i775 and z850 passbands and VLT/FORS2 spectroscopy were obtained, in addition to follow-up Near-Infrared (NIR) imaging in the J- and Ks-bands with NTT/SOFI. We investigate the photometric, structural, and spectral properties of the early-type galaxies in the high-redshift cluster XMMU J1229+0151. Source detection and aperture photometry are performed in the optical and NIR imaging. Galaxy morphology is inspected visually and by means of Sersic profile fitting to the 21 spectroscopically confirmed cluster members in the ACS field of view. The i775-z850 colour-magnitude relation (CMR) is derived with a method based on galaxy magnitudes obtained by fitting the surface brightness of the galaxies with Sersic models. Stellar masses and formation ages of the cluster galaxies are derived by fitting the observed spectral energy distributions (SED) with models developed by Bruzual & Charlot (2003MNRAS.344.1000B). Star-formation histories of the early-type galaxies are constrained by analysing the stacked spectrophotometric data. The structural Sersic index n obtained by model fitting agrees with the visual morphological classification of the confirmed members, indicating a clear predominance of elliptical galaxies (15/21). The i775-z850 colour-magnitude relation of the spectroscopic members shows a very tight red-sequence with a zero point of 0.86±0.04mag, and intrinsic scatter equal to 0.039mag. The CMR obtained with the galaxy models has similar parameters. By fitting both the spectra and SED of the early-type population, we obtain a star-formation-weighted age of 4.3Gyr for a median galaxy stellar-mass of 7.4x1010M. Instead of identifying a brightest cluster galaxy (BCG) unambiguously, we find three bright galaxies with a similar z850 magnitude, which are, in addition, the most massive cluster members, with ∼2x1011M. Our results strengthen the current evidence of a lack of significant evolution in both the scatter and slope of the red-sequence out to z∼1.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: XMMU J1229+0151 - galaxies: high-redshift - galaxies: evolution

Nomenclature: Table 4: [SRG2009] NNNNN N=27 among (Nos 3025-30004).

Simbad objects: 32

goto Full paper

goto View the reference in ADS

Number of rows : 32

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 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5316 1
2 [SRG2009] 4800 GiC 12 29 16.481 +01 53 41.62           ~ 2 0
3 [SRG2009] 4910 GiC 12 29 17.113 +01 53 33.19           ~ 2 0
4 [SRG2009] 4794 GiC 12 29 20.220 +01 53 33.84           ~ 2 0
5 [SRG2009] 4956 GiC 12 29 20.813 +01 53 20.62           ~ 2 0
6 [SRG2009] 3301 GiC 12 29 23.202 +01 51 00.95           ~ 2 0
7 [SRG2009] 5001 GiC 12 29 24.002 +01 53 13.54           ~ 2 0
8 [SRG2009] 4055 GiC 12 29 25.778 +01 51 36.42           ~ 2 0
9 [SRG2009] 4661 GiC 12 29 27.151 +01 53 51.79           ~ 2 0
10 [SRG2009] 20014 GiC 12 29 27.718 +01 50 54.82           ~ 2 0
11 [SRG2009] 20013 GiC 12 29 28.428 +01 51 21.29           ~ 2 0
12 [SRG2009] 3949 GiC 12 29 28.714 +01 51 36.97           ~ 2 0
13 [SRG2009] 30004 GiC 12 29 28.7490 +01 51 36.500           ~ 1 0
14 NAME XMMU J1229.4+0151 ClG 12 29 28.8 +01 51 34           ~ 23 0
15 [SRG2009] 3495 GiC 12 29 29.187 +01 51 29.60           ~ 2 0
16 [SRG2009] 3507 GiC 12 29 29.199 +01 51 25.77           ~ 2 0
17 [SRG2009] 5411 GiC 12 29 29.264 +01 52 18.41           ~ 2 0
18 [SRG2009] 3430 GiC 12 29 29.297 +01 51 21.82           ~ 2 0
19 [SRG2009] 3497 GiC 12 29 29.3970 +01 51 28.470           ~ 1 0
20 [SRG2009] 20010 GiC 12 29 29.448 +01 51 28.81           ~ 3 0
21 [SRG2009] 20008 GiC 12 29 29.643 +01 52 21.73           ~ 2 0
22 [SRG2009] 3205 GiC 12 29 29.944 +01 50 46.29           ~ 2 0
23 [SRG2009] 3025 GiC 12 29 30.520 +01 50 11.02           ~ 2 0
24 [SRG2009] 3428 GiC 12 29 31.043 +01 51 22.78           ~ 2 0
25 [SRG2009] 3524 GiC 12 29 31.375 +01 52 03.62           ~ 2 0
26 [SRG2009] 5499 GiC 12 29 32.2690 +01 52 06.140           ~ 1 0
27 [SRG2009] 5417 GiC 12 29 32.598 +01 52 16.55           ~ 2 0
28 [SRG2009] 4155 GiC 12 29 33.260 +01 51 52.19           ~ 2 0
29 [SRG2009] 4126 GiC 12 29 33.615 +01 51 46.39           ~ 2 0
30 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 151 0
31 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 91 0
32 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 138 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009A&A...501...49S and select 'bookmark this link' or equivalent in the popup menu


2020.07.06-23:16:21

© Université de Strasbourg/CNRS

    • Contact