The variable ROSAT X-ray spectrum of the BL Lac 0716+714 | Zendy

M. Cappi | Zendy; A. Comastri | Zendy; S. Molendi | Zendy; G. G. C. Palumbo | Zendy; R. Della Ceca | Zendy; T. Maccacaro | Zendy

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The variable ROSAT X-ray spectrum of the BL Lac 0716+714

Author(s) -

M. Cappi,

A. Comastri,

S. Molendi,

G. G. C. Palumbo,

R. Della Ceca,

T. Maccacaro

Publication year - 1994

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/271.2.438

Subject(s) - physics , rosat , bl lac object , astrophysics , flux (metallurgy) , light curve , blazar , telescope , astronomy , gamma ray , galaxy , materials science , metallurgy

: 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

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