Timing properties of the X-ray accreting pulsar RX J0440.9+4431 studied with Insight-HXMT and NICER

doi:10.1093/mnras/stad2956

CORC > 云南天文台 > 中国科学院云南天文台 > 中国科学院天体结构与演化重点实验室

	Timing properties of the X-ray accreting pulsar RX J0440.9+4431 studied with Insight-HXMT and NICER
	Li, P P 6,7; Tao, L 7; Tuo, Y L 5; Ge, M Y 7; Kong, L D 5; Zhang, L 7; Bu, Q C 5; Ji, L 4; Qu, J L 7; Zhang, S 7
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2023-10-10
卷号	526 期号:3 页码:3637-3651
关键词	accretion, accretion disc X-rays: binaries stars: neutro pulsars: individual (RX J0440.9+4431)
ISSN号	0035-8711
DOI	10.1093/mnras/stad2956
产权排序	第5完成单位
文献子类	Article
英文摘要	RX J0440.9+4431, a Be/X-ray binary, had its brightest outburst in 2022 since its discovery, with a peak X-ray flux of 2.25 Crab (as recorded by Swift/BAT, 15-50 keV). We analyze the timing properties of this giant outburst using data from Insight-Hard X-ray Modulation Telescope and Neutron Star Interior Composition Exlporer, focusing on the evolution of the pulse profile and pulse fraction. We observe that when the luminosity reached around similar to 3 chi 10(37)erg s(-1), a transition from double-peaked to single-peaked pulse profiles occurred across the energy range, with the peak of the low-energy profile aligning gradually with the peak of the high-energy profile. This change indicates a transition from subcritical to supercritical accretion. Additionally, we found a concave in the pulse fraction as a function of energy around 20-30 keV throughout the entire outburst period. Compared to the low luminosity, the concave becomes weaker in high luminosities, and overall, the pulse fraction is higher. We propose that this concave could be caused by the scattering of high-energy photons by the atmosphere of a neutron star, leading to a dilution of the pulse fraction. As the accretion reaches the supercritical state, the accretion column height increases, resulting in a larger direct component of strongly beamed X-ray flux, and an elevated pulse fraction.
学科主题	天文学
URL标识	查看原文
出版地	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
资助项目	China National Space Administration; China National Space Administration (CNSA); Chinese Academy of Sciences (CAS)[2021YFA0718500]; National Key Research and Development Program of China[12122306]; National Key Research and Development Program of China[U2038102]; National Key Research and Development Program of China[U2031205]; National Key Research and Development Program of China[U2038104]; National Key Research and Development Program of China[U1838201]; National Key Research and Development Program of China[U1838108]; National Key Research and Development Program of China[12173103]; National Key Research and Development Program of China[12041303]; National Natural Science Foundation of China (NSFC)[Y8291130K2]; CAS Pioneer Hundred Talent Program[Y7515570U1]; Scientific and technological innovation project of IHEP
WOS关键词	CYCLOTRON LINE ; 1A 0535+262 ; LUMINOSITY DEPENDENCE ; GIANT OUTBURST ; BINARY ; DISCOVERY ; EMISSION ; CONTINUUM ; PROFILES ; ENERGY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:001156986700002
资助机构	China National Space Administration ; China National Space Administration (CNSA) ; Chinese Academy of Sciences (CAS)[2021YFA0718500] ; National Key Research and Development Program of China[12122306, U2038102, U2031205, U2038104, U1838201, U1838108, 12173103, 12041303] ; National Natural Science Foundation of China (NSFC)[Y8291130K2] ; CAS Pioneer Hundred Talent Program[Y7515570U1] ; Scientific and technological innovation project of IHEP
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/26525]
专题	云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, People’s Republic of China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; 4.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People’s Republic of China; 5.Institut für Astronomie und Astrophysik, Kepler Center for Astro and Particle Physics, Eberhard Karls Universität, Sand 1, D-72076 Tübingen, Germany; 6.Chinese Academy of Sciences, Uinversity of Chinese Academy of Sciences,, 100049 Beijing, People’s Republic of China; 7.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, People’s Republic of China;
推荐引用方式 GB/T 7714	Li, P P,Tao, L,Tuo, Y L,et al. Timing properties of the X-ray accreting pulsar RX J0440.9+4431 studied with Insight-HXMT and NICER[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2023,526(3):3637-3651.
APA	Li, P P.,Tao, L.,Tuo, Y L.,Ge, M Y.,Kong, L D.,...&Guan, J.(2023).Timing properties of the X-ray accreting pulsar RX J0440.9+4431 studied with Insight-HXMT and NICER.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,526(3),3637-3651.
MLA	Li, P P,et al."Timing properties of the X-ray accreting pulsar RX J0440.9+4431 studied with Insight-HXMT and NICER".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 526.3(2023):3637-3651.