arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0710.0961astro-ph
收藏

A0535 +262与SUZAKU的宽带X射线光谱

Broad band X-ray spectroscopy of A0535+262 with SUZAKU

S. Naik, T. Dotani, Y. Terada, M. Nakajima, T. Mihara, M. Suzuki, K. Makishima, K. Sudoh, S. Kitamoto, F. Nagase, T. Enoto, H. Takahashi

摘要:

2005年9月14日,朱雀星对瞬态X射线脉冲双星A0535+262进行了观测,当时该源正处于8 - 9月小爆发的下降阶段。~103 s X射线脉冲波形与能量密切相关,在软X射线能带(<3 keV)为双峰波形,在硬X射线为单峰平滑波形。主倾角的宽度被发现是随着能量的增加。脉冲星的宽带能谱用带指数的正负幂律(NPEX)连续介质模型以及软过剩的黑体分量进行了很好的描述。在源谱中检测到一条等效宽度约为25 eV的弱铁K α发射线。黑体成分在脉冲相位上是脉动的,这意味着吸积柱和/或吸积盘的内边缘可能是A0535+262中软过剩的发射位置。柱密度的较高值被认为是软X射线能带处的二次凹陷的原因。铁线等效宽度被发现是恒定的(误差内)的脉冲相位。然而,铁发射线的正弦型通量变化,在相位与硬X射线通量表明,内吸积盘是铁荧光线的可能的发射区域。

英文摘要:

The transient X-ray binary pulsar A0535+262 was observed with Suzaku on 2005 September 14 when the source was in the declining phase of the August-September minor outburst. The ~103 s X-ray pulse profile was strongly energy dependent, a double peaked profile at soft X-ray energy band (<3 keV) and a single peaked smooth profile at hard X-rays. The width of the primary dip is found to be increasing with energy. The broad-band energy spectrum of the pulsar is well described with a Negative and Positive power-law with EXponential (NPEX) continuum model along with a blackbody component for soft excess. A weak iron K_alpha emission line with an equivalent width ~25 eV was detected in the source spectrum. The blackbody component is found to be pulsating over the pulse phase implying the accretion column and/or the inner edge of the accretion disk may be the possible emission site of the soft excess in A0535+262. The higher value of the column density is believed to be the cause of the secondary dip at the soft X-ray energy band. The iron line equivalent width is found to be constant (within errors) over the pulse phase. However, a sinusoidal type of flux variation of iron emission line, in phase with the hard X-ray flux suggests that the inner accretion disk is the possible emission region of the iron fluorescence line.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑