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arXiv 1905.04553astro-ph.HE
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GX 339-4吸积动力学长期演化研究

Study of the long-term evolution of the accretion dynamics of GX 339-4

U. Aneesha, S. Mandal, H. Sreehari

摘要:

我们使用RXTE、Swift(XRT)、XMM-Newton(PN)档案数据研究了2002-2011年爆发期间银河系黑洞源GX 339-4的动力学行为。我们提出的频谱演化的源使用四个爆发数据,并讨论它们的相似性/差异爆发。我们推断,在2002/03年和2004/05年爆发的第二个高峰可能是由于第二个瞬间触发的不稳定性的吸积盘由于辐射从中央X射线源后,峰I。这在粘性时间范围内传播,在峰I后约80-90天产生峰II。这统一了所有四次爆发,其上升时间约为90天。用两分量吸积盘模型模拟了单个观测光谱,研究了吸积参数的动力学演化。其中,软光子由Keplerian吸积盘产生,硬光子则由热的次Keplerian中心日冕产生。提出了一个通用的数学模型来理解像GX 339-4这样具有较长上升时间的源的吸积参数的演化。此外,还讨论了上升时间较短的突出物理情景可能存在的差异。

英文摘要:

We study the dynamical behaviour of the galactic black hole source GX 339-4 during 2002-2011 outbursts using RXTE, Swift(XRT), XMM-Newton(PN) archival data. We present the spectral evolution of the source using four outbursts data and discuss their similarities/differences between outbursts. We infer that the second peak in 2002/03 and 2004/05 outbursts can be due to a second instant of triggered instability in the accretion disc due to irradiation from the central X-ray source after peak-I. This propagates in viscous time scale and takes ~80-90 days after peak-I to produce peak-II. This unifies all four outbursts having a long rising time of ~90 days. The dynamical evolution of accretion parameters have been studied by modeling the individual observed spectrum with two-component accretion disc model where a Keplerian accretion disc produces the soft photons and the hard part of the spectrum originates from a hot sub-Keplerian central corona. A generic mathematical model has been proposed to understand the evolution of accretion parameters for sources like GX 339-4 which have longer rising time. Also, the possible differences of physical scenario for outbursts with shorter rising time are also discussed.

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