arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.07208astro-ph.HE
收藏

赤背的X射线研究

X-Ray Studies of Redbacks

Mallory S. E. Roberts, Maura A. McLaughlin, Peter A. Gentile, Paul S. Ray, Scott M. Ransom, Jason W. T. Hessels

摘要:

本文研究红背食毫秒双星的X射线性质。它们是介于吸积的低质量X射线双星和绕白矮星运行的毫秒双星之间的过渡系统,因此它们的伴星是非简并的,几乎充满了罗氏瓣。X射线的光度似乎与伴星对着的脉冲星天空的比例成比例,这表明激波区域并不比伴星大得多,这一点得到了轨道光变曲线模型的支持。典型的X射线光子谱指数为$\sim 1$,假设激波大小与伴星的罗氏波瓣横截面相当,典型的0.3-8 keV X射线效率为10%。我们提出了一个概述以前的调查,并提出了新的观察两个redbacks,钱德拉观察PSR J1628 $-$ 3205和XMM牛顿观察PSR J2129 $-$ 0429。后者显示出明显的双峰轨道光变曲线,非热通量的变化因子为$\sim 11$,峰值在轨道相位0.6和0.9附近。我们认为伴星的磁场在红背星双星内激波的X射线发射中起着重要的作用。

英文摘要:

We consider the X-ray properties of the redback class of eclipsing millisecond pulsars. These are transitional systems between accreting low-mass X-ray binaries and binary millisecond pulsars orbiting white dwarfs, and hence their companions are non-degenerate and nearly Roche-lobe filling. The X-ray luminosity seems to scale with the fraction of the pulsar sky subtended by the companion, suggesting the shock region is not much larger than the companion, which is supported by modeling of the orbital light curves. The typical X-ray photon spectral index is $\sim 1$ and the typical 0.3-8 keV X-ray efficiency, assuming a shock size on the order of the companion's Roche lobe cross-section, is on the order of 10%. We present an overview of previous investigations, and present new observations of two redbacks, a Chandra observation of PSR J1628$-$3205 and a XMM-Newton observation of PSR J2129$-$0429. The latter shows a clearly double peaked orbital light curve with variation of the non-thermal flux by a factor of $\sim 11$, with peaks around orbital phases 0.6 and 0.9. We suggest the magnetic field of the companion plays a significant role in the X-ray emission from intrabinary shocks in redbacks.

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。

↑