The variable soft X-ray excess of MKN 766

Details The variable soft X-ray excess of MKN 766 The variable soft X-ray excess of MKN 766

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..420m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 2, p. 420-424

Astronomy and Astrophysics

Astronomy

19

Accretion Disks, Seyfert Galaxies, Stellar Mass Accretion, Variability, X Ray Astronomy, X Ray Spectra, X Rays, Light Curve, Rosat Mission, Spectrum Analysis

Scientific paper

Results are presented from a ROSAT observation of the Seyfert Galaxy Mkn 766. The source displays large amplitude variations over timescales of a few days. A detailed analysis of the flux and spectral variability is presented. We show that the soft (0.1 to 0.9 keV) and hard (0.9 to 2.0 keV) part of the spectrum display different behavior: the soft part hardens as the source brightens while the hard part does not change significantly. This result rests on a hardness ratio analysis and is therefore model independent. Spectral analysis shows that variations cannot be explained by variations in the optical depth of an absorption edge. Variations in the optical depth or ionization state of a warm absorber also appear to be unlikely explanation. Emission from an accretion disk can explain the observed spectrum, the spectral variations and the flux variability of Mkn 766.

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