Variations in energy of cyclotron lines with double structures formed in line-forming region with bulk motion in accreting X-ray pulsars
Variations in energy of cyclotron lines with double structures formed in line-forming region with bulk motion in accreting X-ray pulsars
复制标题
吸积X射线脉冲星体运动线形成区双结构回旋线能量变化
DOI：
10.1093/pasj/psac048
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发表时间：
2022
影响因子：
2.3
通讯作者：
Osamu Nishimura
中科院分区：
文献类型：
--
作者：
Koga;Shunta; Tsukamoto;Yusuke; Okuzumi;Satoshi; Machida;Masahiro N.;Osamu Nishimura
我们表明，在能量的回旋共振散射功能与光度的变化，可以解释通过考虑在二维结构的吸积柱中的下落物质的体速度的变化。通过考虑在回旋加速线形成区域中体速度梯度随光度的变化，计算了回旋加速线能量随光度的变化。我们主要讨论在GX 304−1、A0535+262和船帆座X-1的光谱中观测到的回旋线基频能量与光度之间的正相关关系，除了考虑到回旋线形成区的高度随光度的变化之外，还考虑到回旋线形成区的体速度梯度随光度的变化。因此，我们表明，在所观察到的线能量与光度的变化可以成功地再现由于辐射压力以及高度的吸积丘体速度的变化。
We show that variations in the energy of a cyclotron resonant scattering feature with luminosity can be explained by considering a variation of the bulk velocity of infalling matter in the two-dimensional structure of an accretion column. Variations in the energy of a cyclotron line with luminosity are computed by taking into account the variation in gradient of the bulk velocity with luminosity in a line-forming region. We mainly discuss the positive correlation between the energy of the cyclotron lineat the fundamental and the luminosity as observed in the spectra of GX 304−1, A0535+262, and Vela X-1, considering a change in gradient of the bulk velocity in the line-forming region with luminosity in addition to a change of altitude of the line-forming region with luminosity. Consequently, we demonstrate that the change in the observed line energy with luminosity can be successfully reproduced by a variation in bulk velocity due to radiation pressure as well as the altitude of an accretion mound.