Broad-band X-ray spectrum of the bright Seyfert galaxy MKN 509
Abstract
One of the brightest X-ray Seyfert galaxies, Mkn 509, has been observed with the X-ray satellite EXOSAT. Wide-band (0.05 - 35 keV) spectral information is now available at the same time. Different filters have been rotated in front of the low-energy telescope. The overall spectrum is best fitted by a two-component power law. The intensity and the spectral index of the soft component are in agreement with the extrapolation of the UV spectrum; the high-energy component exhibits a spectral index harder than reported by previous observations and a correspondingly lower intensity. Therefore, at least for this source, the predicted low-energy spectral turnover is a smooth prolongation of the UV spectrum rather than a sharp discontinuity.
- Publication:
-
Nuovo Cimento C Geophysics Space Physics C
- Pub Date:
- December 1984
- DOI:
- 10.1007/BF02573809
- Bibcode:
- 1984NCimC...7..864M
- Keywords:
-
- Cosmic Rays;
- Seyfert Galaxies;
- X Ray Spectra;
- Broadband;
- Exosat Satellite;
- Ultraviolet Spectra