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The variable ROSAT X-ray spectrum of the BL Lac 0716+714 | | M. Cappi
; A. Comastri
; S. Molendi
; G.G.C. Palumbo
; R. Della Ceca
; T. Maccacaro
; | | Date: |
27 Sep 1994 | | Journal: | Mon.Not.Roy.Astron.Soc. 271 (1994) 438 | | Subject: | astro-ph | | Abstract: | The BL Lac object 0716+714 is a powerful flat spectrum radio source detected by CGRO-EGRET at $gamma$-ray energies. It has been observed for about 21000 s over two days by the X-ray telescope onboard the ROSAT satellite and strong flux and spectral variations have been detected. In the time scale of two days the source varied by a factor of $sim 7$; during a sudden ($sim 1000$ s) flux increase, the variation was 70\%. 0716+714 exhibits spectral variations related to source flux variability which may be attributed to a ``soft excess" component most prominent when the source was in a low state. The spectrum of 0716+714 steepened in the soft X-ray band when the flux decreased while in the hard X-ray band remained constant. A double power law model, representing steep synchrotron radiation at low energies and flat inverse Compton radiation above $sim$ 1 keV, best fits both the low and high state. | | Source: | arXiv, astro-ph/9409068 | | Services: | Forum | Review | PDF | Favorites | |
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