Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...468...25h&link_type=abstract
Astronomy and Astrophysics, Volume 468, Issue 1, June II 2007, pp.25-31
Astronomy and Astrophysics
Astrophysics
1
Galaxies: Clusters: General, X-Rays: Galaxies: Clusters, Galaxies: Evolution
Scientific paper
Aims: We quantitatively studied the X-ray cluster morphology, and then investigated the relationships between the cluster X-ray morphology and various cluster characteristics determined from the optical data. Methods: Using a sample of 101 clusters at redshift z˜0.05-1 taken from the Chandra archive, the X-ray morphology is characterized by a series of objectively-measured simple statistics of X-ray surface brightness, which are designed to be robust against variations of image quality caused by various exposure times and various cluster redshifts. Results: The main conclusions from this work are: (1) X-ray morphologies of clusters show no significant correlation with optical richness, or related quantities. (2) X-ray morphologies of clusters are significantly correlated with the degree to which the brightest cluster member stands out against the cluster background. (3) X-ray morphologies of clusters are also correlated with optical concentration defined by galaxy distribution including fainter populations. (4) The ratio of the strong-lensing to X-ray mass measurements is correlated with the X-ray concentration, in that highly X-ray concentrated clusters show compatible strong-lensing and X-ray mass measurements, while those with low X-ray concentration show discrepancy between the two mass measurements.
Boehringer Hans
Hashimoto Yasuhiro
Hasinger Guenter
Henry Patrick J.
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