VizieR Online Data Catalog: X-ray luminosities of early-type galaxies (O'Sullivan+, 2001)
Abstract
We present a catalogue of X-ray luminosities for 401 early-type galaxies, of which 136 are based on newly analysed ROSAT PSPC pointed observations (Cat. ). The remaining luminosities are taken from the literature and converted to a common energy band, spectral model and distance scale. Using this sample we fit the LX/LB relation for early-type galaxies and find a best-fit slope for the catalogue of ~2.2. We demonstrate the influence of group-dominant galaxies on the fit and present evidence that the relation is not well modelled by a single power-law fit. We also derive estimates of the contribution to galaxy X-ray luminosities from discrete-sources and conclude that they provide L(discrete-source-contribution)/LB~29.5erg/s/LB{sun}. We compare this result with luminosities from our catalogue. Lastly, we examine the influence of environment on galaxy X-ray luminosity and on the form of the LX/LB relation. We conclude that although environment undoubtedly affects the X-ray properties of individual galaxies, particularly those in the centres of groups and clusters, it does not change the nature of whole populations.
(1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- January 2002
- Bibcode:
- 2002yCat..73280461O
- Keywords:
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- X-ray sources;
- Galaxy catalogs