NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430
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...
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| Format: | Article |
| Language: | en_US |
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EDP Sciences
2014
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| Online Access: | http://hdl.handle.net/1721.1/89218 https://orcid.org/0000-0001-8804-8946 |
| _version_ | 1826192719643410432 |
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| author | Bachetti, Matteo Miyasaka, Hiromasa Harrison, Fiona A. Furst, Felix Barret, Didier Bellm, Eric C. Boggs, Steven E. Chakrabarty, Deepto Chenevez, Jerome Christensen, Finn E. Craig, William W. Grefenstette, Brian W. Hailey, Charles J. Madsen, Kristin K. Natalucci, Lorenzo Pottschmidt, Katja Stern, Daniel Tomsick, John A. Walton, Dominic J. Wilms, Jörn Zhang, William |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Bachetti, Matteo Miyasaka, Hiromasa Harrison, Fiona A. Furst, Felix Barret, Didier Bellm, Eric C. Boggs, Steven E. Chakrabarty, Deepto Chenevez, Jerome Christensen, Finn E. Craig, William W. Grefenstette, Brian W. Hailey, Charles J. Madsen, Kristin K. Natalucci, Lorenzo Pottschmidt, Katja Stern, Daniel Tomsick, John A. Walton, Dominic J. Wilms, Jörn Zhang, William |
| author_sort | Bachetti, Matteo |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T09:27:53Z |
| format | Article |
| id | mit-1721.1/89218 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:27:53Z |
| publishDate | 2014 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/892182022-09-30T14:33:56Z NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 Bachetti, Matteo Miyasaka, Hiromasa Harrison, Fiona A. Furst, Felix Barret, Didier Bellm, Eric C. Boggs, Steven E. Chakrabarty, Deepto Chenevez, Jerome Christensen, Finn E. Craig, William W. Grefenstette, Brian W. Hailey, Charles J. Madsen, Kristin K. Natalucci, Lorenzo Pottschmidt, Katja Stern, Daniel Tomsick, John A. Walton, Dominic J. Wilms, Jörn Zhang, William Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Chakrabarty, Deepto 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. 2014-09-09T13:15:05Z 2014-09-09T13:15:05Z 2014-01 Article http://purl.org/eprint/type/JournalArticle 2100-014X http://hdl.handle.net/1721.1/89218 Bachetti, Matteo, Hiromasa Miyasaka, Fiona Harrison, Felix Fürst, Didier Barret, Eric C. Bellm, Steven E. Boggs, et al. “NuSTAR Detection of 4s Hard X-Ray Lags from the Accreting Pulsar GS 0834-430.” Edited by E. Bozzo, P. Kretschmar, M. Audard, M. Falanga, and C. Ferrigno. EPJ Web of Conferences 64 (2014): 06011. https://orcid.org/0000-0001-8804-8946 en_US http://dx.doi.org/10.1051/epjconf/20136406011 EPJ Web of Conferences Creative Commons Attribution http://creativecommons.org/licenses/by/2.0 application/pdf EDP Sciences EDP Sciences |
| spellingShingle | Bachetti, Matteo Miyasaka, Hiromasa Harrison, Fiona A. Furst, Felix Barret, Didier Bellm, Eric C. Boggs, Steven E. Chakrabarty, Deepto Chenevez, Jerome Christensen, Finn E. Craig, William W. Grefenstette, Brian W. Hailey, Charles J. Madsen, Kristin K. Natalucci, Lorenzo Pottschmidt, Katja Stern, Daniel Tomsick, John A. Walton, Dominic J. Wilms, Jörn Zhang, William NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 |
| title | NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 |
| title_full | NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 |
| title_fullStr | NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 |
| title_full_unstemmed | NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 |
| title_short | NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430 |
| title_sort | nustar detection of 4s hard x ray lags from the accreting pulsar gs 0834 430 |
| url | http://hdl.handle.net/1721.1/89218 https://orcid.org/0000-0001-8804-8946 |
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