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Post Info TOPIC: Swift J164449.3+573451
Blobrana


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Title: Mass estimate of the Swift J 164449.3+573451 supermassive black hole based on the 3:2 QPO resonance hypothesis
Authors: M. A. Abramowicz, F. K. Liu

A dormant Swift source J 164449.3+573451 (Sw 164449+57) recently experienced a powerful outburst, caused most probably by a tidal disruption of a star by the super-massive black hole at the center of the source. During the outburst, a quasi periodic oscillation (QPO) was detected in the observed X-ray flux from Sw 164449+57. We show that if the observed QPO belongs to a "3:2 twin peak QPO" (with the second frequency not observed), the mass of the black hole in Sw 164449+57 is rather low, M ~ 10^5 solar masses, and the source belongs to a class of intermediate mass black holes. The low mass of the source has been pointed out previously by several authors.

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Observations from Radio to Gamma rays detail how a Black Hole devoured a Star

The source now known as Swift J1644+57 is the result of a truly extraordinary event -- the awakening of a distant galaxy's dormant black hole as it shredded and consumed an errant star. Two new studies, one of them highlighting X- and gamma-ray observations from NASA's Swift and other detectors, the other examining the unprecedented outburst through observations from numerous ground-based radio observatories describe the event throughout the electromagnetic spectrum. Andreas Brunthaler from Max-Planck-Institut für Radioastronomie in Bonn is co-author of the radio study which includes observations with the Expanded Very Large Array (EVLA). The results will be published in this week's issue of "Nature".
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Blobrana


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Black hole caught grabbing a starry treat

On 28 March, NASA's Swift telescope detected several bright bursts of X-rays coming from a patch of the sky where no X-rays had been detected before.
Now two teams, one led by David Burrows of Pennsylvania State University in University Park and the other by Ashley Zauderer of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, say the bursts were probably chunks of a star that was dismembered when it wandered too close to a black hole located 4.5 billion light years away.
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