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Article overview
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ROSAT observations of radio-selected BL Lac objects | | Andrea Comastri
; Silvano Molendi
; Gabriele Ghisellini
; | | Date: |
27 Jun 1995 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/9506128 | | Services: | Forum | Review | PDF | Favorites | |
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