학술논문
NICER Observes the Effects of an X-Ray Burst on the Accretion Environment in Aql X-1
Document Type
Working Paper
Author
Keek, L.; Arzoumanian, Z.; Bult, P.; Cackett, E. M.; Chakrabarty, D.; Chenevez, J.; Fabian, A. C.; Gendreau, K. C.; Guillot, S.; Güver, T.; Homan, J.; Jaisawal, G. K.; Lamb, F. K.; Ludlam, R. M.; Mahmoodifar, S.; Markwardt, C. B.; Miller, J. M.; Prigozhin, G.; Soong, Y.; Strohmayer, T. E.; Wolff, M. T.
Source
The Astrophysical Journal Letters, Volume 855, Issue 1, article id. L4, 6 pp. (2018)
Subject
Language
Abstract
Accretion disks around neutron stars regularly undergo sudden strong irradiation by Type I X-ray bursts powered by unstable thermonuclear burning on the stellar surface. We investigate the impact on the disk during one of the first X-ray burst observations with the Neutron Star Interior Composition Explorer (NICER) on the International Space Station. The burst is seen from Aql X-1 during the hard spectral state. In addition to thermal emission from the neutron star, the burst spectrum exhibits an excess of soft X-ray photons below 1 keV, where NICER's sensitivity peaks. We interpret the excess as a combination of reprocessing by the strongly photoionized disk and enhancement of the pre-burst persistent flux, possibly due to Poynting Robertson drag or coronal reprocessing. This is the first such detection for a short sub-Eddington burst. As these bursts are observed frequently, NICER will be able to study how X-ray bursts affect the disk and corona for a range of accreting neutron star systems and disk states.
Comment: 6 pages, 5 figures, published by ApJ Letters
Comment: 6 pages, 5 figures, published by ApJ Letters