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|a Bachetti, Matteo
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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 Miyasaka, Hiromasa
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|a Harrison, Fiona A.
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|a Furst, Felix
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|a Barret, Didier
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|a Bellm, Eric C.
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|a Boggs, Steven E.
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|a Chakrabarty, Deepto
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|a Chenevez, Jerome
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|a Christensen, Finn E.
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|a Craig, William W.
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|a Grefenstette, Brian W.
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|a Hailey, Charles J.
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|a Madsen, Kristin K.
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|a Natalucci, Lorenzo
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|a Pottschmidt, Katja
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|a Stern, Daniel
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|a Tomsick, John A.
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|a Walton, Dominic J.
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|a Wilms, Jörn
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|a Zhang, William
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|a NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430
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|b EDP Sciences,
|c 2014-09-09T13:15:05Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/89218
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|a The NuSTAR hard X-ray telescope observed the transient Be/X-ray binary GS 0834-430 during its 2012 outburst. The source is detected between 3 - 79 keV with high statistical significance, and we were able to perform very accurate spectral and timing analysis. The phase-averaged spectrum is consistent with that observed in many other magnetized accreting pulsars. We fail to detect cyclotron resonance scattering features in either phase-averaged nor phase-resolved spectra that would allow us to constrain the pulsar's magnetic field. We detect a pulse period of ~ 12:29 s in all energy bands. The pulse profile can be modeled with a double Gaussian and shows a strong and smooth hard lag of up to 0.3 cycles in phase, or about 4s between the pulse at ~ 3 and ≳ 30 keV. This is the first report of such a strong lag in high-mass X-ray binary (HMXB) pulsars. Previously reported lags have been significantly smaller in phase and restricted to low-energies (E<10 keV). We investigate the possible mechanisms that might produce such lags. We find the most likely explanation for this effect to be a complex beam geometry.
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|a en_US
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|a Article
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|t EPJ Web of Conferences
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