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arXiv 1903.00239astro-ph.HE
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寻找Gamma-Ray毫秒脉冲星:候选星的选择

Searching for Gamma-Ray Millisecond Pulsars: Selection of Candidates Revisited

Xuejie Dai, Zhongxiang Wang, Jithesh Vadakkumthani

摘要:

我们正在开始一个项目,通过无线电观测,在{费米伽马射线太空望远镜(Fermi)}上的大面积望远镜(LAT)探测到的不明来源中寻找$γ$射线毫秒双星(MSP)。从土地增值税数据分析中选择好的候选者是该项目的一个重要部分。鉴于LAT数据超过10年,以及新发布的LAT 8年点源列表(FL 8 Y)的出现,我们在之前分析的基础上进行了选择分析,并在此报告结果。对银河系纬度FL 8 Y中的未识别源设定要求为$|b|>$ 5 $^\circ$和曲率显著性$>$ 3 $σ$,具有探测显著性$>$ 6 $σ$的源有202个。我们选取了57个相对明亮的(检测显著性为$>$ 15 $σ$),分析了它们10.2年的LAT数据。检查它们的变异性以排除可变源(可能的~ blazar),构造检验统计图以避免污染源,并且重新获得曲率显著性并与它们的$γ$射线谱进行比较以排除非显著源。最后,我们发现了48个候选者,并根据现有的信息,主要是从多波长的研究,我们讨论了几个候选者的可能性质。这些候选者中的大多数目前正在用65米的上海天马射电望远镜进行观测。

英文摘要:

We are starting a project to find $γ$-ray millisecond pulsars (MSPs) among the unidentified sources detected by the Large Area Telescope (LAT) onboard the {Fermi Gamma-Ray Space Telescope (Fermi)}, by radio observations. The selection of good candidates from analysis of the LAT data is an important part of the project. Given that there is more than 10 years worth of LAT data and the advent of the newly released LAT 8-year point source list (FL8Y), we have conducted a selection analysis, on the basis of our previous analysis, and report the results here. Setting the requirements for the unidentified sources in FL8Y of Galactic latitudes $|b|>$ 5$^\circ$ and curvature significances $>$3$σ$, there are 202 sources with detection signficances $>$6$σ$. We select 57 relatively bright ones (detection significances $>$15$σ$) and analyze their 10.2 years of LAT data. Their variability is checked to exclude variable sources (likely~blazars), test statistic maps are constructed to avoid contaminated sources, and curvature significances are re-obtained and compared to their $γ$-ray spectra to exclude non-significant sources. In the end, 48 candidates are found. Based on the available information, mostly from multi-wavelength studies, we discuss the possible nature of several of the candidates. Most of these candidates are currently being observed with the 65-meter Shanghai Tian Ma Radio Telescope.

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