SIMBAD references

2001MNRAS.328..461O - Mon. Not. R. Astron. Soc., 328, 461-484 (2001/December-1)

A catalogue and analysis of X-ray luminosities of early-type galaxies.


Abstract (from CDS):

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. 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_dscr/L_B≃29.5 erg .s^-1.L^-1_B☉. 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 L_X:L_B 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.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): catalogues - surveys - galaxies: elliptical and lenticular, cD - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/328/461): table3.dat>

CDS comments: Table 3: NGC 708 for NGC 703.

Simbad objects: 439

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