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arXiv 1502.03783astro-ph.HEastro-ph.GAastro-ph.IMastro-ph.SR
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瞬态X射线脉冲星V0332 +53:脉冲相位分辨光谱学和反射模型

Transient X-ray pulsar V0332+53: pulse phase-resolved spectroscopy and the reflection model

A. A. Lutovinov, S. S. Tsygankov, V. F. Suleimanov, A. A. Mushtukov, V. Doroshenko, D. I. Nagirner, J. Poutanen

摘要:

本文介绍了2004年12月至2005年2月在RXTE天文台观测到的一次大爆发期间,在(1-40)x10^{37} erg/s的宽光度范围内首次对瞬态X射线脉冲星V 0332 +53进行的脉冲相位和光度分辨光谱测量的结果。我们定量地描述了光谱,并建立了详细的“三维”图像的光谱变化与脉冲相位和整个爆发。我们发现,所有的光谱参数是强烈的变化与脉冲相位,这种变化的模式显着变化与光度直接反映了相关的变化的结构的发射区和他们的光束图案。根据新近发展的X射线谱中回旋线形成的反射模型,对所得结果作了定性讨论。

英文摘要:

We present the results of the pulse phase- and luminosity-resolved spectroscopy of the transient X-ray pulsar V0332+53, performed for the first time in a wide luminosity range (1-40)x10^{37} erg/s during a giant outburst observed by the RXTE observatory in Dec 2004 - Feb 2005. We characterize the spectra quantitatively and built the detailed "three-dimensional" picture of spectral variations with pulse phase and throughout the outburst. We show that all spectral parameters are strongly variable with the pulse phase, and the pattern of this variability significantly changes with luminosity directly reflecting the associated changes in the structure of emission regions and their beam patterns. Obtained results are qualitatively discussed in terms of the recently developed reflection model for the formation of cyclotron lines in the spectra of X-ray pulsars.

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