ROSAT observations of radio-selected BL Lac objects

Details ROSAT observations of radio-selected BL Lac objects ROSAT observations of radio-selected BL Lac objects

1995-06-27

arxiv.org/abs/astro-ph/9506128v1

Astronomy and Astrophysics

Astrophysics

to appear on MNRAS, 18 pages (latex file plus 5 tables and 3 figures) uuencoded compressed tar postscript files

Scientific paper

ROSAT observations of a homogeneous sample of radio--selected BL Lac objects are presented. Results of a detailed spectral analysis in the soft 0.1-2.0 keV energy range are discussed and compared with similar previously published results. The X--ray spectral shape is discussed in relation to the overall energy distribution with particular emphasys on the high energy gamma--ray emission recently detected by CGRO--EGRET for about half of the objects in the sample. Dividing the objects in our sample on the basis of the radio to X--ray flux ratio (alpha_rx) we show that objects with alpha_rx > 0.75 have flatter X--ray spectra and are likely to be stronger gamma--ray emitters than objects with alpha_rx < 0.75. Moreover we note that the value of the peak energy of the synchrotron component, in a E * F(E) plot, correlates with alpha_rx and alpha_x.

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