PROPERTIES OF CYCLOTRON LINES IN A LINE-FORMING REGION INJECTED BY AN ANISOTROPIC CONTINUUM IN ACCRETING X-RAY PULSARS
PROPERTIES OF CYCLOTRON LINES IN A LINE-FORMING REGION INJECTED BY AN ANISOTROPIC CONTINUUM IN ACCRETING X-RAY PULSARS
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DOI：
10.1088/0004-637x/807/2/164
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
O. Nishimura
中科院分区：
文献类型：
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作者：
O. Nishimura
我研究了回旋线的轮廓特征，这些回旋线是由在罗氏瓣型吸积动力X射线脉冲星的极帽周围形成的吸积柱中的各向异性注入照亮的线形成区域中在多个高度形成的多条线叠加而成的。在这篇文章中，我考虑了从圆柱内部照亮的圆柱几何图形靠近壁面的线条形成区域。我还研究了波束方向图的峰值方向如何影响回旋加速器线的轮廓。我发现，在相位平均光谱中，线条的宽度和深度提供了有关光束方向的信息。我证明了回旋线在相位平均光谱中具有纯吸收，而与圆柱体的高度无关，这一点预计会随着光度的变化而改变。另一方面，在相分辨光谱中，在短圆柱体中强度较低的相可以形成类发射特征，这是L∼10 36？>；尔格S−1所预期的；而由于高圆柱体中大量谱线的叠加，在所有相中都倾向于出现纯吸收特征，这是L≳10 37>；erg S−1所预期的。
I examine the characteristics of profiles of cyclotron lines formed by the superposition of a number of lines formed at a number of altitudes in line-forming regions illuminated by anisotropic injections in an accretion column, which formed around the polar cap of Roche-lobe-type accretion-powered X-ray pulsars. In the present paper, I consider the line-forming region near the walls of a cylindrical geometry illuminated from the inside of the cylinder. I also examine how the direction of the peak of a beam pattern affects the profiles of cyclotron lines. I found that the width and depth of the line in a phase-averaged spectrum provide information concerning the direction of a beam. I demonstrate that the cyclotron line has a pure absorption in the phase-averaged spectrum regardless of the height of the cylinder, which is expected to change with luminosity. On the other hand, in phase-resolved spectra, an emission-like feature can be formed in the phase with lower intensity in a short cylinder, which is expected at L ∼ 10 36 ?> erg s−1, while a pure absorption feature tends to appear in all phases due to the superposition of a large number of lines in a tall cylinder, which is expected at L ≳ 10 37 ?> erg s−1.