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- W1608423046 abstract "We use the ROSAT all sky survey X-ray cluster catalogs and the optical SDSS DR7 galaxy and group catalogs to cross-identify X-ray clusters with their optical counterparts, resulting in a sample of 201 X-ray clusters in the sky coverage of SDSS DR7. We investigate various correlations between the optical and X-ray properties of these X-ray clusters, and find that the following optical properties are correlated with the X-ray luminosity: the central galaxy luminosity, the central galaxy mass, the characteristic group luminosity ($propto Lx^{0.43}$), the group stellar mass ($propto Lx^{0.46}$), with typical 1-$sigma$ scatter of $sim 0.67$ in $log Lx$. Using the observed number distribution of X-ray clusters, we obtain an unbiased scaling relation between the X-ray luminosity, the central galaxy stellar mass and the characteristic satellite stellar mass as ${log L_X} = -0.26 + 2.90 [log (M_{ast, c} + 0.26 M_{rm sat}) -12.0]$ (and in terms of luminosities, as ${log L_X} = -0.15 + 2.38 [log (L_{c} + 0.72 L_{rm sat}) -12.0]$). We find that the systematic difference between different halo mass estimations, e.g., using the ranking of characteristic group stellar mass or using the X-ray luminosity scaling relation can be used to constrain cosmology. Comparing the properties of groups of similar stellar mass (or optical luminosities) and redshift that are X-ray luminous or under-luminous, we find that X-ray luminous groups have more faint satellite galaxies and higher red fraction in their satellites. The cross-identified X-ray clusters together with their optical properties are provided in Appendix B." @default.
- W1608423046 created "2016-06-24" @default.
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- W1608423046 date "2011-10-10" @default.
- W1608423046 modified "2023-10-18" @default.
- W1608423046 title "Cross identification between X-ray and Optical Clusters of Galaxies in the SDSS DR7 Field" @default.
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- W1608423046 hasPublicationYear "2011" @default.
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