论文标题
球状簇中的X射线毫秒脉冲星的普查
A Census of X-ray Millisecond Pulsars in Globular Clusters
论文作者
论文摘要
我们提出了29个银河球状簇（GCS）中X射线毫秒脉冲星（MSP）的全面人口普查，其中包括68个MSP，具有确认的X射线亮度和107个具有X射线上限的MSP。我们对GC MSP进行了以前的X射线研究，并添加了六个MSP的新分析（PSRS J1326 $ - $ 4728A，J1326 $ - $ 4728B，J1518 $+$ 0204C，J1717 $+$ 4308A，J1737 $ 4308A，J1737 $ - $ -0314A和J11807 $ -031807 $ -031807。他们的X射线光谱由单个黑体模型，单个Power-Laws型号或其中的组合很好地描述，X射线发光量从1.9 $ \ times $ 10 $^{30} $ erg s $^{ - 1} $到8.3 $ \ times $ 10 $^$ 10 $^{31} $ erg s $ s $^$^$^$^$^{ - 1} $。我们发现，大多数检测到的X射线MSP具有$ \ sim 10^{30} $ erg s $^{ - 1} $至$ 3 \ times 10^{31} $ ERG S $^{ - 1} $之间的发光度。回想脉冲星是一个相对明亮的MSP总体，其X射线光度为$ \ sim2 \ times10^{31} $ - $ 3 \ times10^{32} $ erg s $^{ - 1} $。黑寡妇在X射线照明中显示了双模式分布，在$ \ sim 7 \ sim 7 \ sim 10^{30} $和$ 2 \ times10^{31} $ erg s $^{ - 1} $之间黯然失色s $^{ - 1} $，暗示人群中的内在差异。我们通过考虑MSP和GC中的恒星相遇率之间的相关性来估计36 GC中的MSP总数，并建议在这36个GC中存在600---1500 MSP。最后，我们估计了银河系凸起中可检测到的X射线可检测的MSP数量，发现具有$ l_x> 10^{33} $ erg s $^s $^{ - 1} $的1--86 msps和20--900 msps和$ l_x> 10^{32} {32} $ erg S $^{ - 1 $^{ - 1} $。
We present a comprehensive census of X-ray millisecond pulsars (MSPs) in 29 Galactic globular clusters (GCs), including 68 MSPs with confirmed X-ray luminosities and 107 MSPs with X-ray upper limits. We compile previous X-ray studies of GC MSPs, and add new analyses of six MSPs (PSRs J1326$-$4728A, J1326$-$4728B, J1518$+$0204C, J1717$+$4308A, J1737$-$0314A, and J1807$-$2459A) discovered in five GCs. Their X-ray spectra are well described by a single blackbody model, a single power-law model, or a combination of them, with X-ray luminosities ranging from 1.9$\times$10$^{30}$ erg s$^{-1}$ to 8.3$\times$10$^{31}$ erg s$^{-1}$. We find that most detected X-ray MSPs have luminosities between $\sim 10^{30}$ erg s$^{-1}$ to $3 \times 10^{31}$ erg s$^{-1}$. Redback pulsars are a relatively bright MSP population with X-ray luminosities of $\sim2\times10^{31}$--$3\times10^{32}$ erg s$^{-1}$. Black widows show a bi-modal distribution in X-ray luminosities, with eclipsing black widows between $\sim 7\times10^{30}$ and $2\times10^{31}$ erg s$^{-1}$, while the two confirmed non-eclipsing black widows are much fainter, with $L_X$ of $1.5-3\times10^{30}$ erg s$^{-1}$, suggesting an intrinsic difference in the populations. We estimate the total number of MSPs in 36 GCs by considering the correlation between the number of MSPs and stellar encounter rate in GCs, and suggest that between 600--1500 MSPs exist in these 36 GCs. Finally, we estimate the number of X-ray detectable MSPs in the Galactic bulge, finding that 1--86 MSPs with $L_X > 10^{33}$ erg s$^{-1}$, and 20--900 MSPs with $L_X > 10^{32}$ erg s$^{-1}$, should be detectable there.
