Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517801t&link_type=abstract
American Astronomical Society Meeting 205, #178.01; Bulletin of the American Astronomical Society, Vol. 37, p.381
Astronomy and Astrophysics
Astronomy
Scientific paper
Time-resolved X-ray spectroscopy has been obtained for the Seyfert galaxy Mrk 766 from XMM-Newton observations. Fe Kα emission has been detected with multiple peaks in energy that vary with time. The time variations appear as sinusoidally varying trails on the spectral-time plane, and provide direct evidence for the existence of matter orbiting a supermassive black hole. Fitting orbit models to the variations strongly indicates that the observed Fe emission originates in a small number of hotspots that are in coplanar orbits consistent with arising on an accretion disk. Taking the independently-determined value for the black hole mass of 4.3 × 106 M&sun; implies the disk is inclined at 26 ± 1o to the line of sight and emission is seen at a distance ˜ 100 gravitational radii ( ˜ 4 A.U.) from the black hole. The period and amplitude of the orbits yield a lower limit for the black hole mass of M BH > 3.6 × 105 M&sun; within a radius of 1.8 A.U.
George Ian Michael
Miller Lance L.
Reeves James N.
Turner Tracey Jane
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