期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 383, 期 1, 页码 L10-L14出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1745-3933.2007.00407.x
关键词
galaxies; clusters; general; X-rays : galaxies; clusters
We explore how the behaviour of galaxy cluster scaling relations are affected by flux-limited selection biases and intrinsic covariance among observable properties. Our models presume log-normal covariance between luminosity (L) and temperature (T) at fixed mass (M), centred on evolving, power-law mean relations as a function of host halo mass. Selection can mimic evolution; the L-M and L-T relations from shallow X-ray flux-limited samples will deviate from mass-limited expectations at nearly all scales while the relations from deep surveys (10(-14) erg s(-1) cm(-2)) become complete, and therefore unbiased, at masses above similar to 2 x 10(14) h(-1) M(circle dot). We derive expressions for low-order moments of the luminosity distribution at fixed temperature, and show that the slope and scatter of the L-T relation observed in flux-limited samples is sensitive to the assumed L-T correlation coefficient. In addition, L-T covariance affects the redshift behaviour of halo counts and mean luminosity in a manner that is nearly degenerate with intrinsic population evolution.
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