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Resolved atomic lines reveal outflows in two ultraluminous X-ray sources
Fabian, Andrew C.; Middleton, Matthew J.; Pinto, Ciro
Ultraluminous X-ray sources are extragalactic, off-nucleus, point sources in galaxies, and have X-ray luminosities in excess of 3 × 1039 ergs per second. They are thought to be powered by accretion onto a compact object. Possible explanations include accretion onto neutron stars with strong magnetic fields, onto stellar-mass black holes…
Relativistic reverberation in the accretion flow of a tidal disruption event
Miller, Jon M.; Kara, Erin; Dai, Lixin +1 more
Our current understanding of the curved space-time around supermassive black holes is based on actively accreting black holes, which make up only ten per cent or less of the overall population. X-ray observations of that small fraction reveal strong gravitational redshifts that indicate that many of these black holes are rapidly rotating; however,…
Ultraluminous X-ray bursts in two ultracompact companions to nearby elliptical galaxies
Romanowsky, Aaron J.; Liu, Jifeng; Strader, Jay +8 more
A flaring X-ray source was found near the galaxy NGC 4697 (ref. 1). Two brief flares were seen, separated by four years. During each flare, the flux increased by a factor of 90 on a timescale of about one minute. There is no associated optical source at the position of the flares, but if the source was at the distance of NGC 4697, then the luminos…