THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION
We present a timing and spectral analysis of the X-ray pulsar XTE J1946+274 observed with Suzaku during an outburst decline in 2010 October and compare with previous results. XTE J1946+274 is a transient X-ray binary consisting of a Be-type star and a neutron star with a 15.75 s pulse period in a 17...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2016
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| Online Access: | http://hdl.handle.net/1721.1/101662 https://orcid.org/0000-0003-2538-0188 |
| _version_ | 1826204052333002752 |
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| author | Marcu-Cheatham, Diana M. Pottschmidt, Katja Falkner, Sebastian Caballero, Isabel Finger, Mark H. Jenke, Peter J. Wilson-Hodge, Colleen A. Grinberg, Victoria Hemphill, Paul B. Kreykenbohm, Ingo Klochkov, Dmitry Rothschild, Richard E. Terada, Yukikatsu Enoto, Teruaki Iwakiri, Wataru Wolff, Michael T. Becker, Peter A. Wood, Kent S. Wilms, Jörn Kuhnel, Matthias Muller, Sebastian Furst, Felix Wilms, Jorn |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Marcu-Cheatham, Diana M. Pottschmidt, Katja Falkner, Sebastian Caballero, Isabel Finger, Mark H. Jenke, Peter J. Wilson-Hodge, Colleen A. Grinberg, Victoria Hemphill, Paul B. Kreykenbohm, Ingo Klochkov, Dmitry Rothschild, Richard E. Terada, Yukikatsu Enoto, Teruaki Iwakiri, Wataru Wolff, Michael T. Becker, Peter A. Wood, Kent S. Wilms, Jörn Kuhnel, Matthias Muller, Sebastian Furst, Felix Wilms, Jorn |
| author_sort | Marcu-Cheatham, Diana M. |
| collection | MIT |
| description | We present a timing and spectral analysis of the X-ray pulsar XTE J1946+274 observed with Suzaku during an outburst decline in 2010 October and compare with previous results. XTE J1946+274 is a transient X-ray binary consisting of a Be-type star and a neutron star with a 15.75 s pulse period in a 172 days orbit with 2–3 outbursts per orbit during phases of activity. We improve the orbital solution using data from multiple instruments. The X-ray spectrum can be described by an absorbed Fermi–Dirac cut-off power-law model along with a narrow Fe Kα line at 6.4 keV and a weak Cyclotron Resonance Scattering Feature (CRSF) at ~35 keV. The Suzaku data are consistent with the previously observed continuum flux versus iron line flux correlation expected from fluorescence emission along the line of sight. However, the observed iron line flux is slightly higher, indicating the possibility of a higher iron abundance or the presence of non-uniform material. We argue that the source most likely has only been observed in the subcritical (non-radiation dominated) state since its pulse profile is stable over all observed luminosities and the energy of the CRSF is approximately the same at the highest (~5 × 10[superscript 37] erg s[superscript −1]) and lowest (~5 × 10[superscript 36] erg s[superscript −1]) observed 3–60 keV luminosities. |
| first_indexed | 2024-09-23T12:48:09Z |
| format | Article |
| id | mit-1721.1/101662 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:48:09Z |
| publishDate | 2016 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1016622022-09-28T10:08:24Z THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION Marcu-Cheatham, Diana M. Pottschmidt, Katja Falkner, Sebastian Caballero, Isabel Finger, Mark H. Jenke, Peter J. Wilson-Hodge, Colleen A. Grinberg, Victoria Hemphill, Paul B. Kreykenbohm, Ingo Klochkov, Dmitry Rothschild, Richard E. Terada, Yukikatsu Enoto, Teruaki Iwakiri, Wataru Wolff, Michael T. Becker, Peter A. Wood, Kent S. Wilms, Jörn Kuhnel, Matthias Muller, Sebastian Furst, Felix Wilms, Jorn MIT Kavli Institute for Astrophysics and Space Research Grinberg, Victoria We present a timing and spectral analysis of the X-ray pulsar XTE J1946+274 observed with Suzaku during an outburst decline in 2010 October and compare with previous results. XTE J1946+274 is a transient X-ray binary consisting of a Be-type star and a neutron star with a 15.75 s pulse period in a 172 days orbit with 2–3 outbursts per orbit during phases of activity. We improve the orbital solution using data from multiple instruments. The X-ray spectrum can be described by an absorbed Fermi–Dirac cut-off power-law model along with a narrow Fe Kα line at 6.4 keV and a weak Cyclotron Resonance Scattering Feature (CRSF) at ~35 keV. The Suzaku data are consistent with the previously observed continuum flux versus iron line flux correlation expected from fluorescence emission along the line of sight. However, the observed iron line flux is slightly higher, indicating the possibility of a higher iron abundance or the presence of non-uniform material. We argue that the source most likely has only been observed in the subcritical (non-radiation dominated) state since its pulse profile is stable over all observed luminosities and the energy of the CRSF is approximately the same at the highest (~5 × 10[superscript 37] erg s[superscript −1]) and lowest (~5 × 10[superscript 36] erg s[superscript −1]) observed 3–60 keV luminosities. 2016-03-10T14:51:19Z 2016-03-10T14:51:19Z 2015-12 2015-08 Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/101662 Marcu-Cheatham, Diana M., Katja Pottschmidt, Matthias Kuhnel, Sebastian Muller, Sebastian Falkner, Isabel Caballero, Mark H. Finger, et al. “THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION.” The Astrophysical Journal 815, no. 1 (December 8, 2015): 44. © 2015 The American Astronomical Society https://orcid.org/0000-0003-2538-0188 en_US http://dx.doi.org/10.1088/0004-637x/815/1/44 The Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Marcu-Cheatham, Diana M. Pottschmidt, Katja Falkner, Sebastian Caballero, Isabel Finger, Mark H. Jenke, Peter J. Wilson-Hodge, Colleen A. Grinberg, Victoria Hemphill, Paul B. Kreykenbohm, Ingo Klochkov, Dmitry Rothschild, Richard E. Terada, Yukikatsu Enoto, Teruaki Iwakiri, Wataru Wolff, Michael T. Becker, Peter A. Wood, Kent S. Wilms, Jörn Kuhnel, Matthias Muller, Sebastian Furst, Felix Wilms, Jorn THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION |
| title | THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION |
| title_full | THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION |
| title_fullStr | THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION |
| title_full_unstemmed | THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION |
| title_short | THE TRANSIENT ACCRETING X-RAY PULSAR XTE J1946+274: STABILITY OF X-RAY PROPERTIES AT LOW FLUX AND UPDATED ORBITAL SOLUTION |
| title_sort | transient accreting x ray pulsar xte j1946 274 stability of x ray properties at low flux and updated orbital solution |
| url | http://hdl.handle.net/1721.1/101662 https://orcid.org/0000-0003-2538-0188 |
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