2019A&A...626A..48R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:24:38

2019A&A...626A..48R - Astronomy and Astrophysics, volume 626A, 48-48 (2019/6-1)

Projection effects in galaxy cluster samples: insights from X-ray redshifts.

RAMOS-CEJA M.E., PACAUD F., REIPRICH T.H., MIGKAS K., LOVISARI L. and SCHELLENBERGER G.

Abstract (from CDS):

Presently, the largest sample of galaxy clusters selected in X-rays comes from the ROSAT All-Sky Survey (RASS). Although there have been many interesting clusters discovered with the RASS data, the broad point spread function of the ROSAT satellite limits the attainable amount of spatial information for the detected objects. This leads to the discovery of new cluster features when a re-observation is performed with higher-resolution X-ray satellites. Here we present the results from XMM-Newton observations of three clusters: RXC J2306.6-1319, ZwCl 1665, and RXC J0034.6-0208, for which the observations reveal a double or triple system of extended components. These clusters belong to the extremely expanded HIghest X-ray FLUx Galaxy Cluster Sample (eeHIFLUGCS), which is a flux-limited cluster sample (fX,500≥5x10–12erg/s/cm2 in the 0.1-2.4keV energy band). For each structure in each cluster, we determine the redshift with the X-ray spectrum and find that the components are not part of the same cluster. This is confirmed by an optical spectroscopic analysis of the galaxy members. Therefore, the total number of clusters is actually seven, rather than three. We derive global cluster properties of each extended component. We compare the measured properties to lower-redshift group samples, and find a good agreement. Our flux measurements reveal that only one component of the ZwCl 1665 cluster has a flux above the eeHIFLUGCS limit, while the other clusters will no longer be part of the sample. These examples demonstrate that cluster-cluster projections can bias X-ray cluster catalogues and that with high-resolution X-ray follow-up this bias can be corrected.

Abstract Copyright: © ESO 2019

Journal keyword(s): X-rays: galaxies: clusters - large-scale structure of Universe - galaxies: clusters: intracluster medium

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 - 2020
#notes
1 ZwCl 0031-0220 ClG 00 34.2 -02 03           ~ 10 0
2 MCXC J0034.6-0208 ClG 00 34 30.7 -02 06 40           ~ 12 0
3 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 512 0
4 ZwCl 0820+0436 ClG 08 22 56.53 +04 18 12.3           ~ 24 0
5 SDSS-C4-DR3 1356 ClG 08 23 21.667 +04 22 20.90           ~ 3 0
6 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 332 1
7 ACO 1958 ClG 14 43 13 +30 58.3           ~ 51 0
8 NAME LHB X 16 42.0 +02 19           ~ 257 0
9 ACO 2529 ClG 23 06 21.35 -13 15 52.6           ~ 18 0
10 MCXC J2306.5-1319 ClG 23 06 36.0 -13 19 12           ~ 6 0
11 BAX 346.7154-13.4164 ClG 23 06 51.7 -13 24 59           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:24:38

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