Physics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..751...15m&link_type=abstract
GENERAL RELATIVITY AND GRAVITATIONAL PHYSICS: 16th SIGRAV Conference on General Relativity and Gravitational Physics. AIP Confe
Physics
Active And Peculiar Galaxies And Related Systems, Galactic Nuclei, Circumnuclear Matter, And Bulges, Relativity And Gravitation
Scientific paper
We report results from X-ray observations of the Seyfert galaxy NGC 3516. We detect an emission feature at 6.1 keV in the time-averaged spectrum, confirming previous results. By applying a new analysis technique, we find that the feature varies systematically in flux at intervals of 25 ks. The peak moves in energy between 5.7 keV and 6.5 keV. The spectral evolution of the feature agrees with Fe K emission arising from a spot on the accretion disc, illuminated by a corotating flare located between 7 and 16 gravitational radii from the central black hole, and modulated by Doppler and gravitational effects as the flare orbits around in the accretion disc. Combining the orbital time and the location of the orbiting flare, the mass of the central hole is estimated to be (1-5) × 107 Msolar, which is in agreement with values obtained from other techniques.
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