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A hard-to-soft state transition during a luminosity decline of aquila X-1

文献类型：期刊论文

作者Yu, Wenfei; Dolence, Joshua
刊名ASTROPHYSICAL JOURNAL
出版日期2007-10-01
卷号667期号:2页码:1043-1047
关键词accretion accretion disks black hole physics stars : individual (Auila X-1 4U 1705-44 GX 339-4 XTE J1550-564)
英文摘要We have discovered a spectral transition from the low/hard (LH) state to the high/soft (HS) state when Aquila X-1 was declining in observations made with the Rossi X-Ray Timing Explorer (RXTE). The 2-200 keV energy flux corresponding to the state transition is 1.1x10(-9) ergs cm(-2) s(-1), an order of magnitude lower than observed in the past. The 2-200 keV peak flux of the following HS state is 1.6x10(-9) ergs cm(-2) s(-1). The relation between the luminosity of the hard-to-soft state transition and the peak luminosity of the following HS state confirms the linear relation found previously. This implies that the luminosity of the hard-to-soft state transition is not determined solely by the mass accretion rate, but appears to be determined by the peak luminosity of the soft X-ray outburst. We also found that the LH-to-HS state transition occurred at a luminosity similar to that of the corresponding HS-to-LH state transition; i.e., there is no apparent hysteresis. These results provide additional evidence that the mass in the accretion disk affects the luminosity of the hard-to-soft state transition, and that the accretion flow that powers the LH state is related to the accretion flow that powers the HS state at a later time.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]X-RAY BINARIES ; NEUTRON-STAR ; ACCRETION ; MASS ; OUTBURST ; PEAK ; QUIESCENCE ; EMISSION ; BEHAVIOR ; GX-339-4
收录类别SCI
语种英语
WOS记录号WOS:000249699200027
源URL[http://119.78.226.72/handle/331011/19431]  
专题上海天文台_星系宇宙学重点实验室
作者单位1.Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Illinois, Ctr Theoret Astrophys, Urbana, IL 61801 USA
3.Univ Illinois, Dept Phys, Urbana, IL 61801 USA
4.Univ Illinois, Dept Astron, Urbana, IL 61801 USA
推荐引用方式
GB/T 7714		 Yu, Wenfei,Dolence, Joshua. A hard-to-soft state transition during a luminosity decline of aquila X-1[J]. ASTROPHYSICAL JOURNAL,2007,667(2):1043-1047.
APA Yu, Wenfei,&Dolence, Joshua.(2007).A hard-to-soft state transition during a luminosity decline of aquila X-1.ASTROPHYSICAL JOURNAL,667(2),1043-1047.
MLA Yu, Wenfei,et al."A hard-to-soft state transition during a luminosity decline of aquila X-1".ASTROPHYSICAL JOURNAL 667.2(2007):1043-1047.

入库方式： OAI收割

来源：上海天文台

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