The correlation timescale of the X-ray flux during the outbursts of soft X-ray transients

The correlation timescale of the X-ray flux during the outbursts of soft X-ray transients
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软 X 射线瞬变爆发期间 X 射线通量的相关时间尺度

DOI:
10.1007/s11433-010-0013-5
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发表时间:
2010-05
期刊:
Science China: Physics, Mechanics and Astronomy
影响因子:
--
通讯作者:
Li TiPei
Li TiPei
中科院分区:
其他
文献类型:
--
作者:
Wu YuXiang;Yu WenFei;Li TiPei

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最近对黑洞和中子星低质量x射线双星(LMXBs)的研究表明,发生低/硬(LH)到高/软(HS)状态转变时的x射线通量与随后HS状态的峰值通量呈正相关。通过对罗西x射线定时探测器(RXTE)上的全天监测(ASM)数据的分析,我们发现在软x射线瞬变(SXT)爆发期间,源达到HS通量峰值后的HS态通量仍然与跃迁通量相关。通过研究GX 339-4、Aql X-1和4U 1705-44的大爆发或耀斑,我们发现这种相关性分别在lh到hs状态转变后的250、40和50 d内成立。这些时间尺度对应于恒星质量黑洞或半径为~ 104-5Rg的中子星周围标准吸积盘中的粘性时间尺度,表明吸积流中的质量吸积率要么在给定时间内的大范围半径内相关,要么在给定半径下的长时间内相关。如果吸积几何是由亚开普勒流流入或流出和LH态盘流组成的双流几何,则半径高达~ 105rg的盘流将直接或间接地促成近乎瞬时的非热辐射,从而影响状态转变发生的时间。
Recent studies of black hole and neutron star low mass X-ray binaries (LMXBs) show a positive correlation between the X-ray flux at which the low/hard(LH)-to-high/soft(HS) state transition occurs and the peak flux of the following HS state. By analyzing the data from the All Sky Monitor (ASM) onboard the Rossi X-ray Timing Explorer (RXTE), we show that the HS state flux after the source reaches its HS flux peak still correlates with the transition flux during soft X-ray transient (SXT) outbursts. By studying large outbursts or flares of GX 339-4, Aql X-1 and 4U 1705-44, we have found that the correlation holds up to 250, 40, and 50 d after the LH-to-HS state transition, respectively. These time scales correspond to the viscous time scale in a standard accretion disk around a stellar mass black hole or a neutron star at a radius of ∼104–5Rg, indicating that the mass accretion rates in the accretion flow either correlate over a large range of radii at a given time or correlate over a long period of time at a given radius. If the accretion geometry is a two-flow geometry composed of a sub-Keplerian inflow or outflow and a disk flow in the LH state, the disk flow with a radius up to ∼105Rgwould have contributed to the nearly instantaneous non-thermal radiation directly or indirectly, and therefore affects the time when the state transition occurs.
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