NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430
The Nuclear Spectroscopic Telescope Array hard X-ray telescope observed the transient Be/X-ray binary GS 0834–430 during its 2012 outburst—the first active state of this system observed in the past 19 yr. We performed timing and spectral analysis and measured the X-ray spectrum between 3-79 keV with...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2014
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| Online Access: | http://hdl.handle.net/1721.1/88261 https://orcid.org/0000-0001-8804-8946 |
| _version_ | 1826207169700167680 |
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| author | Miyasaka, Hiromasa Bachetti, Matteo 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, Jorn Zhang, William |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Miyasaka, Hiromasa Bachetti, Matteo 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, Jorn Zhang, William |
| author_sort | Miyasaka, Hiromasa |
| collection | MIT |
| description | The Nuclear Spectroscopic Telescope Array hard X-ray telescope observed the transient Be/X-ray binary GS 0834–430 during its 2012 outburst—the first active state of this system observed in the past 19 yr. We performed timing and spectral analysis and measured the X-ray spectrum between 3-79 keV with high statistical significance. We find the phase-averaged spectrum to be consistent with that observed in many other magnetized, accreting pulsars. We fail to detect cyclotron resonance scattering features that would allow us to constrain the pulsar's magnetic field in either phase-averaged or phase-resolved spectra. Timing analysis shows a clearly detected pulse period of ~12.29 s in all energy bands. The pulse profiles show a strong, energy-dependent hard phase lag of up to 0.3 cycles in phase, or about 4 s. Such dramatic energy-dependent lags in the pulse profile have never before been reported in high-mass X-ray binary 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 this energy-dependent pulse phase shift. We find the most likely explanation for this effect is a complex beam geometry. |
| first_indexed | 2024-09-23T13:45:27Z |
| format | Article |
| id | mit-1721.1/88261 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:45:27Z |
| publishDate | 2014 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/882612022-10-01T16:55:50Z NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 Miyasaka, Hiromasa Bachetti, Matteo 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, Jorn Zhang, William Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Chakrabarty, Deepto The Nuclear Spectroscopic Telescope Array hard X-ray telescope observed the transient Be/X-ray binary GS 0834–430 during its 2012 outburst—the first active state of this system observed in the past 19 yr. We performed timing and spectral analysis and measured the X-ray spectrum between 3-79 keV with high statistical significance. We find the phase-averaged spectrum to be consistent with that observed in many other magnetized, accreting pulsars. We fail to detect cyclotron resonance scattering features that would allow us to constrain the pulsar's magnetic field in either phase-averaged or phase-resolved spectra. Timing analysis shows a clearly detected pulse period of ~12.29 s in all energy bands. The pulse profiles show a strong, energy-dependent hard phase lag of up to 0.3 cycles in phase, or about 4 s. Such dramatic energy-dependent lags in the pulse profile have never before been reported in high-mass X-ray binary 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 this energy-dependent pulse phase shift. We find the most likely explanation for this effect is a complex beam geometry. United States. National Aeronautics and Space Administration (Contract NNG08FD06C) 2014-07-11T12:49:28Z 2014-07-11T12:49:28Z 2013-09 2013-06 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/88261 Miyasaka, Hiromasa, Matteo Bachetti, Fiona A. Harrison, Felix Furst, Didier Barret, Eric C. Bellm, Steven E. Boggs, et al. “NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430.” The Astrophysical Journal 775, no. 1 (September 20, 2013): 65. https://orcid.org/0000-0001-8804-8946 en_US http://dx.doi.org/10.1088/0004-637X/775/1/65 The Astrophysical Journal Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing arXiv |
| spellingShingle | Miyasaka, Hiromasa Bachetti, Matteo 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, Jorn Zhang, William NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 |
| title | NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 |
| title_full | NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 |
| title_fullStr | NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 |
| title_full_unstemmed | NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 |
| title_short | NuSTAR DETECTION OF HARD X-RAY PHASE LAGS FROM THE ACCRETING PULSAR GS 0834–430 |
| title_sort | nustar detection of hard x ray phase lags from the accreting pulsar gs 0834 430 |
| url | http://hdl.handle.net/1721.1/88261 https://orcid.org/0000-0001-8804-8946 |
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