论文标题
X射线与CYG X-1的无线电发射之间的相关性和滞后
Correlations and lags between X-ray and radio emission of Cyg X-1
论文作者
论文摘要
Cygnus X-1是一个银河黑洞二进制，是微QuaSar。它的X射线发射最有可能源于吸积流，而无线电发射来自磁化射流。我们研究其X射线和无线通量之间的长期互相关，以寻找相关峰的滞后。我们在Rossi X射线计时探索器上使用来自All Sky Monitor的软X射线数据，来自Neil Gehrels Swift董事会的Burst Alert Alert TheScope的硬X射线数据，以及Ryle和Ami望远镜的15 GHz无线电监视数据，这些望远镜的数据涵盖了CYG X-1的所有光曲线。黑洞二进制中无线电/X射线相关性的先前研究集中在硬光谱状态下的软X射线/无线电相关性上。相比之下，我们最强的相关性是在整个数据中的硬X射线和广播之间以$ \ Lessim 1 $日的滞后。这表明射流来自CYG X-1的所有状态的硬X射线发射电晕/热积聚。我们还发现了有关柔软状态的软X射线的长长滞后的证据。这表明磁场通过其高质量供体的积聚盘对磁场的长期对流，这类似于另一个带有高质量供体Cyg X-3的微QuaSar的情况。
Cygnus X-1 is a Galactic black-hole binary and a microquasar. Its X-ray emission originates most likely in the accretion flow, while the radio emission is from a magnetized jet. We study long-term cross-correlations between its X-ray and radio fluxes, searching for lags of the peak of the correlation. We use soft X-ray data from the All Sky Monitor on board of Rossi X-ray Timing Explorer, hard X-ray data from the Burst Alert Telescope on board of Neil Gehrels Swift, and 15 GHz radio monitoring data from the Ryle and AMI telescopes, which light curves cover all of the spectral states of Cyg X-1. Previous studies of radio/X-ray correlations in black-hole binaries concentrated on the soft X-ray/radio correlation in the hard spectral state. In contrast, our strongest correlation is between the hard X-rays and radio in the entire data at a $\lesssim 1$-day lag. This indicates the jet formation from a hard X-ray emitting corona/hot accretion flow through all states of Cyg X-1. We also find evidence for a long lag of the radio with respect to the soft X-rays in the soft state. This indicates long-term advection of the magnetic field through the accretion disc from its high-mass donor, which is similar to the case of another microquasar with a high-mass donor, Cyg X-3.
