New results from the HRX BL Lac sample

Details New results from the HRX BL Lac sample New results from the HRX BL Lac sample

2000-07-07

arxiv.org/abs/astro-ph/0007089v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, Proceedings of the Conference X-ray Astronomy'99: Stellar Endpoints, AGN and Diffuse Background. To appear

Scientific paper

10.1063/1.1434671

We present results for the Hamburg BL Lac sample, based on data provided by the RASS-BSC. By fitting a single power law to the X-ray data we find, in a number of objects, an additional absorbing component to the galactic value of NH, which might be attributed to intrinsic absorption. A more probable cause seems however to be a curvature in the X-ray spectra in the sense that they are more curved for steeper slopes. The known relation between the X-ray spectral slope and the ratio between optical and X-ray flux alpha_ox also applies to this BL Lac sample, even though less significant than in previous works. We also find a dependence of X-ray luminosity on alpha_ox.

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