Switches between accretion structures during flares in 4U 1901+03

doi:10.1093/mnras/staa569

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 硬X射线调制望远镜卫星

	Switches between accretion structures during flares in 4U 1901+03
	Ji, L.; Ducci, L.; Santangelo, A.; Zhang, S.; Suleimanov, V; Tsygankov, S.; Doroshenko, V; Nabizadeh, A.; Zhang, S. N.; Ge, M. Y.
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2020
卷号	493 期号:4 页码:5680-5692
关键词	stars: neutron X-rays: binaries X-rays: individual: 4U 1901+03
ISSN号	0035-8711
DOI	10.1093/mnras/staa569
文献子类	Article
英文摘要	We report on our analysis of the 2019 outburst of the X-ray accreting pulsar 4U 1901+03 observed with Insight-HXMT and NICER. Both spectra and pulse profiles evolve significantly in the decaying phase of the outburst. Dozens of flares are observed throughout the outburst. They are more frequent and brighter at the outburst peak. We find that the flares, which have a duration from tens to hundreds of seconds, are generally brighter than the persistent emission by a factor of similar to 1.5. The pulse-profile shape during the flares can be significantly different from that of the persistent emission. In particular, a phase shift is clearly observed in many cases. We interpret these findings as direct evidence of changes of the pulsed beam pattern, due to transitions between the sub- and supercritical accretion regimes on a short time-scale. We also observe that at comparable luminosities the flares' pulse profiles are rather similar to those of the persistent emission. This indicates that the accretion on the polar cap of the neutron star is mainly determined by the luminosity, i.e. the mass accretion rate.
电子版国际标准刊号	1365-2966
WOS关键词	RAY PULSAR PROFILES ; LUMINOSITY DEPENDENCE ; GEOMETRY ; BURSTS ; PHASE ; X-4
语种	英语
WOS记录号	WOS:000539094400082
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/287876]
专题	硬X射线调制望远镜卫星
推荐引用方式 GB/T 7714	Ji, L.,Ducci, L.,Santangelo, A.,et al. Switches between accretion structures during flares in 4U 1901+03[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,493(4):5680-5692.
APA	Ji, L..,Ducci, L..,Santangelo, A..,Zhang, S..,Suleimanov, V.,...&Zhuang, R. L..(2020).Switches between accretion structures during flares in 4U 1901+03.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,493(4),5680-5692.
MLA	Ji, L.,et al."Switches between accretion structures during flares in 4U 1901+03".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 493.4(2020):5680-5692.