2007A&A...474..707W


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.15CEST12:14:51

2007A&A...474..707W - Astronomy and Astrophysics, volume 474, 707-716 (2007/11-2)

Complex X-ray morphology of Abell 3128: a distant cluster behind a disturbed cluster.

WERNER N., CHURAZOV E., FINOGUENOV A., MARKEVITCH M., BURENIN R., KAASTRA J.S. and BOEHRINGER H.

Abstract (from CDS):

We present here the results of a detailed study of the X-ray properties of the cluster of galaxies Abell 3128 (z=0.06), based on the analysis of deep (100ks) XMM-Newton data. The most obvious feature of the X-ray morphology of A3128 is the presence of two X-ray peaks separated by ∼12'. By detecting the redshifted Fe K line, we find that the Northeast (NE) X-ray peak observed toward A3128 is a distant luminous cluster of galaxies at redshift z=0.44. Our subsequent optical spectroscopic observation of a distant radio bright galaxy in the centre of the NE X-ray peak with the Magellan telescope also revealed a redshift of z=0.44, confirming the association of the galaxy with the cluster seen in X-rays. We detect a gravitational arc around the galaxy. The properties of this galaxy indicate that it is the cD galaxy of the cluster in the background. The properties of the Southwest X-ray peak suggest that it is the core of a group merging with A3128 along our line of sight. Based on 2D maps of thermodynamic properties of the intra-cluster medium determined after subtracting a model for the background cluster, we conclude that an enhanced surface brightness region at a distance of ∼2.8' from the centre of the galaxy distribution is the centre of the gravitational potential of the cluster A3128. The unrelaxed nature of A3128 can be attributed to its location in the high density environment of the Horologium-Reticulum supercluster.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 3128 - X-rays: galaxies: clusters

Nomenclature: Fig.1: [WCF2007] WW Peak (Nos SW, NE).

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME HOR-RET SUPERCL SCG 03 16 -48.0           ~ 56 3
2 ACO 3125 ClG 03 27 22 -53 30.6           ~ 56 2
3 [WCF2007] SW Peak X 03 29 54.0 -52 34 30           ~ 2 0
4 ACO 3128 ClG 03 30 34.6 -52 33 12           ~ 164 3
5 [MMK2007] J033056.93-522812.9 ALS 03 30 56.93 -52 28 12.9   21.49 19.80 18.38   ~ 4 0
6 [WCF2007] NE Peak ClG 03 31 15.0 -52 34 15           ~ 1 0
7 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6021 3
8 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 475 0
9 NAME LHB X 16 42.0 +02 19           ~ 238 0
10 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2056 2
11 NAME Local Group GrG ~ ~           ~ 6654 0

    Equat.    Gal    SGal    Ecl

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2019.10.15-12:14:51

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