Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277l...5p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 1, pp. L5-L10.
Astronomy and Astrophysics
Astronomy
307
Accretion, Accretion Discs, Galaxies: Active, Galaxies: Individual: Re 1034+39, Galaxies: Seyfert, X-Rays: Galaxies
Scientific paper
The dominant X-ray emission of Seyfert galaxies has the form of a power law of mean photon index 1.9-2.0 which extends to at least 100 keV. However, recent observations, primarily from ROSAT, have revealed a subset of Seyfert galaxies with a qualitatively different X-ray appearance and unusual optical spectra. RE 1034+39, first identified in the ROSAT EUV survey, may be a prototype of this class of AGN. ROSAT and ASCA X-ray spectra are reported here, showing RE 1034+39 to have intense soft X-ray emission, together with an unusually steep 2-10 keV power law of photon index ~2.6, with possibly some contribution from ionized reflection. We speculate that an unusually high accretion rate is causing the intense soft X-ray flux, which - in turn - is Compton cooling the hard photon source, giving the observed steep spectrum at higher energies. The strong soft X-radiation may also be ionizing the disc and inhibiting the formation of the optical broad-line clouds. We point out the similarity of RE 1034+39 to the `high'-state spectra from the Galactic black hole candidate binary systems such as Cyg X-1.
Done Christine
Osborne Julian Paul
Pounds Kenneth A.
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