A NICER Thermonuclear Burst from the Millisecond X-Ray Pulsar SAX J1808.4-3658
The Neutron Star Interior Composition Explorer (NICER) has extensively monitored the 2019 August outburst of the 401 Hz millisecond X-ray pulsar SAX J1808.4-3658. In this Letter, we report on the detection of a bright helium-fueled Type I X-ray burst. With a bolometric peak flux of (2.3 0.1) × 10−7...
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| Veröffentlicht in: | Astrophysical journal. Letters 2019-11, Vol.885 (1), p.L1 |
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| creator | Bult, Peter Jaisawal, Gaurava K. Güver, Tolga Strohmayer, Tod E. Altamirano, Diego Arzoumanian, Zaven Ballantyne, David R. Chakrabarty, Deepto Chenevez, Jérôme Gendreau, Keith C. Guillot, Sebastien Ludlam, Renee M. |
| description | The Neutron Star Interior Composition Explorer (NICER) has extensively monitored the 2019 August outburst of the 401 Hz millisecond X-ray pulsar SAX J1808.4-3658. In this Letter, we report on the detection of a bright helium-fueled Type I X-ray burst. With a bolometric peak flux of (2.3 0.1) × 10−7 erg s−1 cm−2, this was the brightest X-ray burst among all bursting sources observed with NICER to date. The burst shows a remarkable two-stage evolution in flux, emission lines at 1.0 and 6.7 keV, and burst oscillations at the known pulsar spin frequency, with 4% fractional sinusoidal amplitude. We interpret the burst flux evolution as the detection of the local Eddington limits associated with the hydrogen and helium layers of the neutron star envelope. The emission lines are likely associated with Fe, due to reprocessing of the burst emission in the accretion disk. |
| doi_str_mv | 10.3847/2041-8213/ab4ae1 |
| format | Article |
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| subjects | Accretion disks Astrophysics Bolometers Emission Emission lines Evolution Fluctuations Helium Hydrogen Millisecond pulsars Neutron flux Neutron stars Neutrons Physics Pulsars Reprocessing X-ray bursts |
| title | A NICER Thermonuclear Burst from the Millisecond X-Ray Pulsar SAX J1808.4-3658 |
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