论文标题
X射线Swift J1858.6-0814中的X射线发射线在XMM-Newton-RGS：盘或风中观察到？
Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind?
论文作者
论文摘要
我们发现来自XMM-Newton-RGS的数据中的X射线二进制Swift J1858.6-0814的软X射线发射线：N VII，O VII和O VIII，以及在NE IX和其他更高离子化过渡时检测到的显着残留物。这些可能与圆盘大气有关，例如在光波长下的发射线中的Swift J1858.6-0814中检测到的Swift J1858.6-0814中所检测到的。实际上，n vii线是红移的，与是p-cygni曲线的发射成分一致。我们发现发射等离子体具有电离参数$ \ log（ξ）= 1.35 \ pm0.2 $和密度$ n> 1.5 \ times10^{11} $ cm $^{ - 3} $。从此，我们推断出发射等离子体必须在电离源的$ 10^{13} $ cm之内，$ \ sim5 \ times10^{7} r _ {\ rm g} $，对于140万美元（$ 2 \ times10^{9}（m/14m _ {\ odot}）$ cm）。我们将其与其他X射线二进制区和活性银河核中的已知类别发射线区域进行了比较。
We find soft X-ray emission lines from the X-ray binary Swift J1858.6-0814 in data from XMM-Newton-RGS: N VII, O VII and O VIII, as well as notable residuals short of a detection at Ne IX and other higher ionisation transitions. These could be associated with the disc atmosphere, as in accretion disc corona sources, or with a wind, as has been detected in Swift J1858.6-0814 in emission lines at optical wavelengths. Indeed, the N VII line is redshifted, consistent with being the emitting component of a P-Cygni profile. We find that the emitting plasma has an ionisation parameter $\log(ξ)=1.35\pm0.2$ and a density $n>1.5\times10^{11}$ cm$^{-3}$. From this, we infer that the emitting plasma must be within $10^{13}$ cm of the ionising source, $\sim5\times10^{7}r_{\rm g}$ for a $1.4M_{\odot}$ neutron star, and from the line width that it is at least $10^4r_{\rm g}$ away ($2\times10^{9}(M/1.4M_{\odot})$ cm). We compare this with known classes of emission line regions in other X-ray binaries and active galactic nuclei.
