标题： 对吸积X射线脉冲星1A 0535+262的伽马射线辐射的深度搜索 显示英文标题

标题： Deep search for gamma-ray emission from the accreting X-ray pulsar 1A 0535+262

摘要： 二进制系统是伽马射线源的一个已建立的子类。 高质量X射线双星脉冲星1A~0535+262长期以来被认为可能是伽马射线发射体，尽管以前使用\textit{费米}-LAT和VERITAS数据进行的伽马射线搜索仅得到了上限。 我们旨在利用超过13年的\textit{费米}-LAT数据对1A~0535+262进行深入的伽马射线辐射和脉动搜索。 分析针对整个\textit{费米}-LAT数据集以及自\textit{费米}发射以来1A~0535+262经历的X射线爆发进行了。 各种X射线观测被用来生成脉动搜索的历书。 我们还研究了长期伽马射线通量变化，并对爆发进行了轨道相位分辨分析。 在整个\textit{费米}-LAT任务期间或其X射线爆发期间，我们没有检测到1A~0535+262的稳定或脉动伽马射线辐射。 因此，我们在95%置信水平下得出了迄今为止最深的伽马射线光度上限，约为(2.3$-$4.7)$\times 10^{32}\, \rm erg \, s^{-1}$，具体取决于假设的不同光谱指数，这导致了$L_{\rm \gamma}$与$L_{\rm X}$ (2$-$150 keV) 的比值为 (1.9$-$3.9)$\times10^{-6}$。 显示英文摘要

摘要： Binary systems are a well-established subclass of gamma-ray sources. The high mass X-ray binary pulsar 1A~0535+262 has been considered to be a possible gamma-ray emitter for a long time, although former gamma-ray searches using \textit{Fermi}-LAT and VERITAS data resulted in upper limits only. We aim at a deep search for gamma-ray emission and pulsations from 1A~0535+262 using more than 13 years of \textit{Fermi}-LAT data. The analysis was performed for both the whole \textit{Fermi}-LAT data set, as well as for the X-ray outbursts that 1A~0535+262 has experienced since the launch of \textit{Fermi}. Various X-ray observations have been used to generate the ephemeris for the pulsation search. We also investigate the long-term gamma-ray flux variability and perform orbital phase-resolved analysis for the outbursts. We did not detect any steady or pulsed gamma-ray emission from 1A~0535+262 during the whole \textit{Fermi}-LAT mission span or its X-ray outbursts. We thus derived the deepest gamma-ray luminosity upper limits to date at the 95\% confidence level to be around (2.3$-$4.7)$\times 10^{32}\, \rm erg \, s^{-1}$ depending on different spectral indices assumed, which results in a ratio of $L_{\rm \gamma}$ to $L_{\rm X}$ (2$-$150 keV) being (1.9$-$3.9)$\times10^{-6}$.