期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 407, 期 1, 页码 83-93出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2010.16920.x
关键词
catalogues; surveys; galaxies: clusters: general; X-rays: galaxies: clusters
资金
- NASA LTSA [NAG 5-8253]
- SAO [GO2-3168X, GO5-6133X, GO0-11140X, DD5-6031X, GO7-8125X, GO8-9118X]
- U.S. Department of Energy [DE-AC02-76SF00515]
- Stanford Graduate Fellowship
- NASA
- STFC [ST/F002963/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1] Funding Source: researchfish
We present a statistically complete sample of very X-ray luminous galaxy clusters detected in the MAssive Cluster Survey (MACS). This second MACS release comprises all 34 MACS clusters with nominal X-ray fluxes in excess of 2 x 10-12 erg s-1 cm-2 (0.1-2.4 keV) in the ROSAT Bright Source Catalogue; two-thirds of them are new discoveries. Extending over the redshift range from 0.3 to 0.5, this subset complements the complete sample of the 12 most distant MACS clusters (z > 0.5) published in 2007 and further exemplifies the efficacy of X-ray selection for the compilation of samples of intrinsically massive galaxy clusters. Extensive follow-up observations with Chandra/ACIS led to three additional MACS cluster candidates being eliminated as (predominantly) X-ray point sources. For another four clusters - which, however, remain in our sample of 34 - the point-source contamination was found to be about 50 per cent. The median X-ray luminosity of 1.3 x 1045 erg s-1 (0.1-2.4 keV, Chandra, within r(500)) of the clusters in this subsample demonstrates the power of the MACS strategy to find the most extreme and rarest clusters out to significant redshift. A comparison of the optical and X-ray data for all clusters in this release finds a wide range of morphologies with no obvious bias in favour of either relaxed or merging systems.
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