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	A MAJOR X-RAY OUTBURST FROM AN ULTRALUMINOUS X-RAY SOURCE IN M82
	Kaaret, Philip ; Feng, Hua ; Gorski, Mark
	2010-10-12 ; 2010-10-12
关键词	black hole physics galaxies: individual (M82) galaxies: stellar content X-rays: binaries X-rays: galaxies QUASI-PERIODIC OSCILLATIONS XMM-NEWTON OBSERVATIONS MASS BLACK-HOLE STAR-CLUSTERS STARBURST GALAXIES GX-339-4 X-1 XTE-J1550-564 EVOLUTION NUCLEI Astronomy & Astrophysics
中文摘要	We detected amajor X-ray outburst from M82 with a duration of 79 days, an average flux of 5x10(-11) erg cm(-2) s(-1) in the 2-10 keV band, and strong variability. The X-ray spectrum remained hard throughout the outburst. We obtained a Chandra observation during the outburst that shows that the emission arises from the ultraluminous X-ray source X41.4+60. This source has an unabsorbed flux of (5.4 +/- 0.2) x10(-11) erg cm(-2) s(-1) in the 0.3-8 kcV band, equivalent to an isotropic luminosity of 8.5x10(40) erg s(-1). The spectrum is adequately fitted with an absorbed power law with a photon index of 1.55 +/- 0.05. This photon index is very similar to the value of 1.61 +/- 0.06 measured previously while the flux was (2.64 +/- 0.14) x 10(-11) erg cm(-2) s(-1). Thus, the source appears to remain in the hard state even at the highest flux levels observed. The X-ray spectral and timing data available for X41.4+60 are consistent with the source being in a luminous hard state and a black hole mass in the range of one to a few thousand solar masses.
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/123456789/78852]
专题	清华大学
推荐引用方式 GB/T 7714	Kaaret, Philip,Feng, Hua,Gorski, Mark. A MAJOR X-RAY OUTBURST FROM AN ULTRALUMINOUS X-RAY SOURCE IN M82[J],2010, 2010.
APA	Kaaret, Philip,Feng, Hua,&Gorski, Mark.(2010).A MAJOR X-RAY OUTBURST FROM AN ULTRALUMINOUS X-RAY SOURCE IN M82..
MLA	Kaaret, Philip,et al."A MAJOR X-RAY OUTBURST FROM AN ULTRALUMINOUS X-RAY SOURCE IN M82".(2010).

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