UV to X ray AGN accretion disc spectra: Model fitting of IUE and ROSAT All Sky Survey data

Details UV to X ray AGN accretion disc spectra: Model fitting of IUE and ROSAT All Sky Survey data UV to X ray AGN accretion disc spectra: Model fitting of IUE and ROSAT All Sky Survey data

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..130d&link_type=abstract

In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 130-133 (SEE

Astronomy and Astrophysics

Astronomy

3

Accretion Disks, Active Galactic Nuclei, Iue, Rosat Mission, Ultraviolet Spectra, X Ray Spectra, Emission Spectra, Proportional Counters, Quasars, Radiant Flux Density, Red Shift, Sky Surveys (Astronomy), Stellar Models

Scientific paper

Big blue bump accretion disk spectra are presented for a sample of radio loud and radio quiet quasars, comprising IUE (International Ultraviolet Explorer) and Rosat All Sky Survey (RASS) data. These data are fitted to geometrically thin alpha accretion disk spectra, attempting to restrict the permitted range of the model parameters: central mass, accretion rate, alpha viscosity parameter and inclination angle of the accretion disk. The accretion disk structure is calculated. The local accretion disk continua are determined. The integrated accretion disk spectra are corrected for Doppler shifting due to the rotation of the accretion disk and gravitational red shift and light deflection due to gravitational field of the central black hole. Mass accretion rates are found in the range form 0.2 to 1.2 times MEdd. Only in some of the sources the accretion disk component is hard enough to produce a measurable soft X-ray flux. The fits require a steep (alphaenergy approximately 1 to 1.5) underlying power law component consistent with the optical to X-ray broad band power law index alphaox and the X-ray power law indexes as measured by the Rosat Position Sensitive Proportional Counter (PSPC).

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