Astro-1 and ground-based observations of Markarian 335: Evidence for an accretion disk

Details Astro-1 and ground-based observations of Markarian 335: Evidence for an accretion disk Astro-1 and ground-based observations of Markarian 335: Evidence for an accretion disk

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..632z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 2, p. 632-642

Astronomy and Astrophysics

Astronomy

26

Accretion Disks, Active Galactic Nuclei, Astro Missions (Sts), Markarian Galaxies, Seyfert Galaxies, Ultraviolet Astronomy, Accretion Disks, Black Holes (Astronomy), Compton Effect, Emission Spectra, Lyman Alpha Radiation, Red Shift

Scientific paper

Simultaneous UV and optical observations of the Seyfert galaxy Markarian 335 (z = 0.026) during the Astro-1 mission yield a spectrum spanning the wavelength range of 912-8410 A. In the sub-Ly alpha region a prominent blended emission feature of O VI lambda lambda 1032, 1038, and Ly beta is nearly as strong as C IV wavelength 1549. The continuum flux extends beyond the redshifted Luman limit without a noticeable discontinuity, but a siginificant change in slope exists near the redhsifted Lyman edge. We suggest that such a change may be the signature of a Lyman edge in an accretion disk seen at a small inclination angle. Using a disk model including such an edge, we fit the spectrum with a central black hole mass of 5 x 107 solar mass, an accretion rate of 0.07 solar mass/yr, and an optical depth at the Lyman edge of 0.4. To account for the strong O VI emission as well as the soft X-ray excess, we consider the effects of Comptonization on the disk spectrum, which can produce a high-energy tail for the UV bump and also smooth the Lyman edge feature.

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