NICER Observation of Unusual Burst Oscillations in 4U 1728-34
© 2019. The American Astronomical Society. All rights reserved. The Neutron Star Interior Composition Explorer has observed seven thermonuclear X-ray bursts from the low-mass X-ray binary neutron star 4U 1728-34 from the start of the mission's operations until 2019 February. Three of these burs...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Astronomical Society
2021
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| Online Access: | https://hdl.handle.net/1721.1/134817 |
| _version_ | 1826198939940945920 |
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| author | Mahmoodifar, Simin Strohmayer, Tod E Bult, Peter Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Homan, Jeroen Jaisawal, Gaurava K Keek, Laurens Wolff, Michael T |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Mahmoodifar, Simin Strohmayer, Tod E Bult, Peter Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Homan, Jeroen Jaisawal, Gaurava K Keek, Laurens Wolff, Michael T |
| author_sort | Mahmoodifar, Simin |
| collection | MIT |
| description | © 2019. The American Astronomical Society. All rights reserved. The Neutron Star Interior Composition Explorer has observed seven thermonuclear X-ray bursts from the low-mass X-ray binary neutron star 4U 1728-34 from the start of the mission's operations until 2019 February. Three of these bursts show oscillations in their decaying tail, with frequencies that are within 1 Hz of the previously detected burst oscillations from this source. Two of these burst oscillations have unusual properties: they have large fractional root mean square (rms) amplitudes of 48% ± 9% and 46% ± 9%, and they are detected only at photon energies above 6 keV. By contrast, the third detected burst oscillation is compatible with previous observations of this source, with a fractional rms amplitude of 7.7% ± 1.5% rms in the 0.3 to 6.2 keV energy band. We discuss the implications of these large-amplitude burst oscillations, finding that they are difficult to explain with the current theoretical models for X-ray burst tail oscillations. |
| first_indexed | 2024-09-23T11:12:15Z |
| format | Article |
| id | mit-1721.1/134817 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:12:15Z |
| publishDate | 2021 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1348172023-02-24T16:48:40Z NICER Observation of Unusual Burst Oscillations in 4U 1728-34 Mahmoodifar, Simin Strohmayer, Tod E Bult, Peter Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Homan, Jeroen Jaisawal, Gaurava K Keek, Laurens Wolff, Michael T MIT Kavli Institute for Astrophysics and Space Research © 2019. The American Astronomical Society. All rights reserved. The Neutron Star Interior Composition Explorer has observed seven thermonuclear X-ray bursts from the low-mass X-ray binary neutron star 4U 1728-34 from the start of the mission's operations until 2019 February. Three of these bursts show oscillations in their decaying tail, with frequencies that are within 1 Hz of the previously detected burst oscillations from this source. Two of these burst oscillations have unusual properties: they have large fractional root mean square (rms) amplitudes of 48% ± 9% and 46% ± 9%, and they are detected only at photon energies above 6 keV. By contrast, the third detected burst oscillation is compatible with previous observations of this source, with a fractional rms amplitude of 7.7% ± 1.5% rms in the 0.3 to 6.2 keV energy band. We discuss the implications of these large-amplitude burst oscillations, finding that they are difficult to explain with the current theoretical models for X-ray burst tail oscillations. 2021-10-27T20:09:19Z 2021-10-27T20:09:19Z 2019 2020-09-21T18:44:27Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134817 en 10.3847/1538-4357/AB20C4 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 | Mahmoodifar, Simin Strohmayer, Tod E Bult, Peter Altamirano, Diego Arzoumanian, Zaven Chakrabarty, Deepto Gendreau, Keith C Guillot, Sebastien Homan, Jeroen Jaisawal, Gaurava K Keek, Laurens Wolff, Michael T NICER Observation of Unusual Burst Oscillations in 4U 1728-34 |
| title | NICER Observation of Unusual Burst Oscillations in 4U 1728-34 |
| title_full | NICER Observation of Unusual Burst Oscillations in 4U 1728-34 |
| title_fullStr | NICER Observation of Unusual Burst Oscillations in 4U 1728-34 |
| title_full_unstemmed | NICER Observation of Unusual Burst Oscillations in 4U 1728-34 |
| title_short | NICER Observation of Unusual Burst Oscillations in 4U 1728-34 |
| title_sort | nicer observation of unusual burst oscillations in 4u 1728 34 |
| url | https://hdl.handle.net/1721.1/134817 |
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