On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747
© 2019. The American Astronomical Society. All rights reserved.. We report on the Neutron Star Interior Composition Explorer (NICER) monitoring campaign of the 468 Hz accreting millisecond X-ray pulsar IGR J17379-3747. From a detailed spectral and timing analysis of the coherent pulsations we find t...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Astronomical Society
2021
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| Online Access: | https://hdl.handle.net/1721.1/136453 |
| _version_ | 1826209309781917696 |
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| author | Bult, Peter Markwardt, Craig B Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Jaisawal, Gaurava K Ray, Paul S Strohmayer, Tod E |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Bult, Peter Markwardt, Craig B Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Jaisawal, Gaurava K Ray, Paul S Strohmayer, Tod E |
| author_sort | Bult, Peter |
| collection | MIT |
| description | © 2019. The American Astronomical Society. All rights reserved.. We report on the Neutron Star Interior Composition Explorer (NICER) monitoring campaign of the 468 Hz accreting millisecond X-ray pulsar IGR J17379-3747. From a detailed spectral and timing analysis of the coherent pulsations we find that they show a strong energy dependence, with soft thermal emission lagging about 640 μs behind the hard, Comptonized emission. Additionally, we observe uncommonly large pulse fractions, with measured amplitudes in excess of 20% sinusoidal fractional amplitude across the NICER passband and fluctuations of up to ∼70%. Based on a phase-resolved spectral analysis, we suggest that these extreme properties might be explained if the source has an unusually favorable viewing geometry with a large magnetic misalignment angle. Due to these large pulse fractions, we were able to detect pulsations down to quiescent luminosities ( erg ). We discuss these low-luminosity pulsations in the context of transitional millisecond pulsars. |
| first_indexed | 2024-09-23T14:20:30Z |
| format | Article |
| id | mit-1721.1/136453 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:20:30Z |
| publishDate | 2021 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1364532023-09-19T18:12:58Z On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 Bult, Peter Markwardt, Craig B Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Jaisawal, Gaurava K Ray, Paul S Strohmayer, Tod E MIT Kavli Institute for Astrophysics and Space Research © 2019. The American Astronomical Society. All rights reserved.. We report on the Neutron Star Interior Composition Explorer (NICER) monitoring campaign of the 468 Hz accreting millisecond X-ray pulsar IGR J17379-3747. From a detailed spectral and timing analysis of the coherent pulsations we find that they show a strong energy dependence, with soft thermal emission lagging about 640 μs behind the hard, Comptonized emission. Additionally, we observe uncommonly large pulse fractions, with measured amplitudes in excess of 20% sinusoidal fractional amplitude across the NICER passband and fluctuations of up to ∼70%. Based on a phase-resolved spectral analysis, we suggest that these extreme properties might be explained if the source has an unusually favorable viewing geometry with a large magnetic misalignment angle. Due to these large pulse fractions, we were able to detect pulsations down to quiescent luminosities ( erg ). We discuss these low-luminosity pulsations in the context of transitional millisecond pulsars. 2021-10-27T20:35:26Z 2021-10-27T20:35:26Z 2019 2020-09-22T17:00:26Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136453 en 10.3847/1538-4357/AB1B26 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 American Astronomical Society The American Astronomical Society |
| spellingShingle | Bult, Peter Markwardt, Craig B Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Jaisawal, Gaurava K Ray, Paul S Strohmayer, Tod E On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 |
| title | On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 |
| title_full | On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 |
| title_fullStr | On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 |
| title_full_unstemmed | On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 |
| title_short | On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747 |
| title_sort | on the curious pulsation properties of the accreting millisecond pulsar igr j17379 3747 |
| url | https://hdl.handle.net/1721.1/136453 |
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