QQ客服 官方微博 反馈留言

	SPECTRAL STATES AND EVOLUTION OF ULTRALUMINOUS X-RAY SOURCES
	Feng, Hua ; Kaaret, Philip
	2010-10-12 ; 2010-10-12
关键词	accretion, accretion disks black hole physics X-rays: binaries X-rays: individual (NGC 5204 X-1, Holmberg II X-1, IC 342 X-1 and X-2, the Antennae X-11, X-16, X-42, and X-44, NGC 1313 X-1 and X-2, M82 X41.4+60 and X42.3+59) ANTENNAE GALAXIES NGC-4038/4039 MASS BLACK-HOLES XMM-NEWTON OBSERVATIONS QUASI-PERIODIC OSCILLATIONS ACCRETION DISK MODELS SOURCE NGC-5204 X-1 SOURCE IC-342 X-1 OPTICAL COUNTERPART NEARBY GALAXIES HOLMBERG-II Astronomy & Astrophysics
中文摘要	We examined spectral evolution in ultraluminous X-ray sources (ULXs) with apparent luminosities of about 10(40) erg s(-1). Based on new results in this paper, and those reported in the literature, two common spectral behaviors were found. Some ULXs in starburst galaxies have varying luminosity (L) but remain in the hard state with power-law spectra and a constant, hard photon index (Gamma). Other ULXs, such as NGC 5204 X-1, show a correlation between L and Gamma. We interpret this L-Gamma correlated phase as an intermediate state with hybrid properties from the thermal dominant and steep power-law states. When the spectra of NGC 5204 X-1 are fitted with a multicolor disk blackbody plus power-law model, the X-ray luminosity increases with the effective temperature of the accretion disk in a manner similar to that found in stellar-mass black hole X-ray binaries, suggesting that the emission arises from an accretion disk. The luminosity, disk size, and temperature suggest that NGC 5204 X-1 harbors a compact object more massive than stellar-mass black holes. In contrast, the disk model in IC 342 X-1 is ruled out because the luminosity decreases as the temperature increases; sources with such behavior may represent a class of objects with super-Eddington accretion. Also, we report a peculiar soft spectral feature from IC 342 X-2 and variability on a timescale of 20 ks from Holmberg II X-1. More observations are needed to test these results.
语种	英语 ; 英语
出版者	IOP PUBLISHING LTD ; BRISTOL ; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78796]
专题	清华大学
推荐引用方式 GB/T 7714	Feng, Hua,Kaaret, Philip. SPECTRAL STATES AND EVOLUTION OF ULTRALUMINOUS X-RAY SOURCES[J],2010, 2010.
APA	Feng, Hua,&Kaaret, Philip.(2010).SPECTRAL STATES AND EVOLUTION OF ULTRALUMINOUS X-RAY SOURCES..
MLA	Feng, Hua,et al."SPECTRAL STATES AND EVOLUTION OF ULTRALUMINOUS X-RAY SOURCES".(2010).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。