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Power spectral properties of the soft spectral states in four black hole transients

Research in Astronomy and Astrophysics 2021年第7期21卷 143-154页

作者： Dong-Ming Mao Wen-Fei Yu Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China university of Chinese Academy of Sciences Beijing 100049China

The x-ray variability in the soft x-ray spectral state of black hole binaries is primarily characterized by a power-law noise(PLN), which is thought to originate from the propagation of the modulation in the mass accretion rate of a standard accretion disk flow. Such a PLN has also been revealed in the disk spectral component in the hard and the intermediate states in several black hole binaries. Here we present an investigation of the Rossi x-ray Timing Explorer(RxTE) observations of four black hole transients in which soft spectral states were observed twenty times or more. We show that in the soft spectral state, the PLN index varied in a large range between –1.64 and –0.62, and the fractional rms variability calculated in the 0.01 – 20 Hz frequency range reached as large as 7.67% and as low as 0.83%. Remarkably,we have found evidence of an inclination dependence of the maximal fractional rms variability, the averaged fractional rms variability and the fractional rms variability of the median in the sample based on current knowledge of inclination of black hole binaries. An inclination dependence has only been predicted in early magnetohydrodynamic simulations of isothermal disks limited to a high-frequency regime. In theory,the noise index is related to the physics of inward propagation of disk fluctuations, while the fractional rms amplitude reflects the intrinsic properties of the magnetohydrodynamic nature of the accretion *** results therefore suggest that x-ray variability in the soft state can be used to put constraints on the properties of the accretion flow as well as the inclination of the accretion disk.

关键词： x-rays:general x-rays:binaries x-rays:individual:4u 1630-47 H 1743-322 xTE J1817-330 xTE J1859+226

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