Dependence of X-Ray Luminosity on Temperature for Groups and Clusters with the Moving Median Statistics

Details Dependence of X-Ray Luminosity on Temperature for Groups and Clusters with the Moving Median Statistics Dependence of X-Ray Luminosity on Temperature for Groups and Clusters with the Moving Median Statistics

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chphl..19..286c&link_type=abstract

Chinese Physics Letters, Volume 19, Issue 2, pp. 286-288 (2002).

Physics

Scientific paper

We re-analyse the relationship between the x-ray luminosity (LX) and the temperature (T) of groups and clusters of galaxies, based on the largest sample of 40 groups and 188 clusters. We employ the moving median statistics for the data set, along with the proper linear regression. Our newly established LX-T relations for groups and clusters show no significant difference within statistical uncertainties, yielding LX ∝ T 2.79+/-0.01 (groups) and LX ∝ T 2.54+/-0.004 (clusters). This also supports the hierarchical scenario of structure formation in which groups are simply the scale-down version of clusters. It is argued that the break in the LX-T relation on group scales detected in previous studies may suffer from sparse data sample and poor statistical methods.

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