Broad-band X-ray spectrum of the bright Seyfert galaxy MKN 509

Details Broad-band X-ray spectrum of the bright Seyfert galaxy MKN 509 Broad-band X-ray spectrum of the bright Seyfert galaxy MKN 509

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ncimc...7..864m&link_type=abstract

(Convegno Nazionale di Fisica Cosmica, 2nd, L'Aquila, Italy, May 29-June 1, 1984) Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol

Computer Science

Cosmic Rays, Seyfert Galaxies, X Ray Spectra, Broadband, Exosat Satellite, Ultraviolet Spectra

Scientific paper

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.

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