<i>NICER</i> Observes the Effects of an X-Ray Burst on the Accretion Environment in Aql X-1

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dc.contributor.authorKeek, L.
dc.contributor.authorArzoumanian, Z.
dc.contributor.authorBult, P.
dc.contributor.authorCackett, E. M.
dc.contributor.authorChakrabarty, D.
dc.contributor.authorChenevez, J.
dc.contributor.authorFabian, A. C.
dc.contributor.authorGendreau, K. C.
dc.contributor.authorGuillot, S.
dc.contributor.authorGuver, T.
dc.contributor.authorHoman, J.
dc.contributor.authorJaisawal, G. K.
dc.contributor.authorLamb, F. K.
dc.contributor.authorLudlam, R. M.
dc.contributor.authorMahmoodifar, S.
dc.contributor.authorMarkwardt, C. B.
dc.contributor.authorMiller, J. M.
dc.contributor.authorPrigozhin, G.
dc.contributor.authorSoong, Y.
dc.contributor.authorStrohmayer, T. E.
dc.contributor.authorWolff, M. T.
dc.date.accessioned2025-01-23T21:21:13Z
dc.date.available2025-01-23T21:21:13Z
dc.date.issued2018
dc.description.abstractAccretion 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.
dc.fuente.origenWOS
dc.identifier.doi10.3847/2041-8213/aab104
dc.identifier.eissn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.3847/2041-8213/aab104
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101222
dc.identifier.wosidWOS:000431541900001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal letters
dc.rightsacceso restringido
dc.subjectaccretion, accretion disks
dc.subjectstars: individual (Aql X-1)
dc.subjectstars: neutron
dc.subjectX-rays: binaries
dc.subjectX-rays: bursts
dc.title<i>NICER</i> Observes the Effects of an X-Ray Burst on the Accretion Environment in Aql X-1
dc.typeartículo
dc.volumen855
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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