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|a Linares, Manuel Alegret
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Chakrabarty, Deepto
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|a Chakrabarty, Deepto
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|a Linares, Manuel Alegret
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|a Chakrabarty, Deepto
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|a Van Der Klis, M.
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|a On the Cooling Tails of Thermonuclear X-ray Bursts: The IGR J17480-2446 Link
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|b Institute of Physics Publishing,
|c 2012-04-13T15:19:23Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/70013
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|a The neutron star transient and 11 Hz X-ray pulsar IGR J17480-2446, recently discovered in the globular cluster Terzan 5, showed unprecedented bursting activity during its 2010 October-November outburst. We analyzed all X-ray bursts detected with the Rossi X-ray Timing Explorer and find strong evidence that they all have a thermonuclear origin, despite the fact that many do not show the canonical spectral softening along the decay imprinted on type I X-ray bursts by the cooling of the neutron star photosphere. We show that the persistent-to-burst power ratio is fully consistent with the accretion-to-thermonuclear efficiency ratio along the whole outburst, as is typical for type I X-ray bursts. The burst energy, peak luminosity, and daily-averaged spectral profiles all evolve smoothly throughout the outburst, in parallel with the persistent (non-burst) luminosity. We also find that the peak-burst to persistent luminosity ratio determines whether or not cooling is present in the bursts from IGR J17480-2446, and argue that the apparent lack of cooling is due to the "non-cooling" bursts having both a lower peak temperature and a higher non-burst (persistent) emission. We conclude that the detection of cooling along the decay is a sufficient, but not a necessary condition to identify an X-ray burst as thermonuclear. Finally, we compare these findings with X-ray bursts from other rapidly accreting neutron stars.
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|a Netherlands Organization for Scientific Research ((NWO) Rubicon Fellowship)
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|a en_US
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|a Article
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|t Astrophysical Journal. Letters
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