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NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430

Bozzo, E. and Bachetti, Matteo and Miyasaka, Hiromasa and Harrison, Fiona A. and Fürst, Felix and Barret, Didier and Bellm, Eric C. and Boggs, Steven E. and Chakrabarty, Deepto and Chenevez, Jerome and Christensen, Finn E. and Craig, William W. and Grefenstette, Brian W. and Hailey, Charles J. and Madsen, Kristin K. and Natalucci, Lorenzo and Pottschmidt, Katja and Stern, Daniel and Tomsick, John A. and Walton, Dominic J. and Wilms, Jörn and Zhang, William W. and Kretschmar, P. and Audard, M. and Falanga, M. and Ferrigno, C. (2014) NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430. EPJ Web of Conferences, 64 . Art. No. 06011. ISSN 2100-014X. http://resolver.caltech.edu/CaltechAUTHORS:20161025-194735540

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/epjconf/20136406011DOIArticle
http://www.epj-conferences.org/articles/epjconf/abs/2014/01/epjconf_mag2013_06011/epjconf_mag2013_06011.htmlPublisherArticle
ORCID:
AuthorORCID
Bachetti, Matteo0000-0002-4576-9337
Harrison, Fiona A.0000-0003-2992-8024
Bellm, Eric C.0000-0001-8018-5348
Boggs, Steven E.0000-0001-9567-4224
Madsen, Kristin K.0000-0003-1252-4891
Stern, Daniel0000-0003-2686-9241
Additional Information:© Owned by the authors, published by EDP Sciences, 2014. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Group:Space Radiation Laboratory, NuSTAR
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2014-72
Record Number:CaltechAUTHORS:20161025-194735540
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161025-194735540
Official Citation:NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 Matteo Bachetti, Hiromasa Miyasaka, Fiona Harrison, Felix Fürst, Didier Barret, Eric C. Bellm, Steven E. Boggs, Deepto Chakrabarty, Jerome Chenevez, Finn E. Christensen, William W. Craig, Brian W. Grefenstette, Charles J. Hailey, Kristin K. Madsen, Lorenzo Natalucci, Katja Pottschmidt, Daniel Stern, John A. Tomsick, Dominic J. Walton, Jörn Wilms and William Zhang EPJ Web of Conferences, 64 (2014) 06011 DOI: http://dx.doi.org/10.1051/epjconf/20136406011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71491
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:26 Oct 2016 18:41
Last Modified:28 Oct 2017 03:05

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