Chandra measurements of a complete sample of X-ray luminous galaxy clusters: the luminosity–mass relation

We present the results of work involving a statistically complete sample of 34 galaxy clusters, in the redshift range 0.15 = z = 0.3 observed with Chandra. We investigate the luminosity-mass (LM) relation for the cluster sample, with the masses obtained via a full hydrostatic mass analysis. We utili...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2017-02, Vol.465 (1), p.858-858
Main Authors: Giles, P A, Maughan, B J, Dahle, H, Bonamente, M, Landry, D, Jones, C, Joy, M, Murray, S S, van der Pyl, N
Format: Article
Language:English
Subjects:
Astronomy
Clusters
Equivalence
Fluid dynamics
Galactic clusters
Hydrostatics
Luminosity
Samples
Star & galaxy formation
Statistical analysis
Statistical methods
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Summary:We present the results of work involving a statistically complete sample of 34 galaxy clusters, in the redshift range 0.15 = z = 0.3 observed with Chandra. We investigate the luminosity-mass (LM) relation for the cluster sample, with the masses obtained via a full hydrostatic mass analysis. We utilize a method to fully account for selection biases when modelling the LM relation, and find that the LM relation is significantly different from the relation modelled when not account for selection effects. We find that the luminosity of our clusters is 2.2 plus or minus 0.4 times higher (when accounting for selection effects) than the average for a given mass and its mass is 30 per cent lower than the population average for a given luminosity. Equivalently, using the LM relation measured from this sample without correcting for selection biases would lead to the underestimation by 40 percent of the average mass of a cluster with a given luminosity. Comparing the hydrostatic masses to mass estimates determined from the YX parameter, we find that they are entirely consistent, irrespective of the dynamical state of the cluster.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stw2621