在费米非关联源中寻找$γ$射线脉冲星：2FGL J1906 .5+0720
Searching for $γ$-Ray Pulsars among Fermi Unassociated Sources: 2FGL J1906.5+0720
摘要：
本文报道了对高等级候选脉冲星\textit{Fermi} 2FGL J1906.5 $+$ 0720的\textit{Fermi}大天区望远镜数据的分析结果。为了更好地研究我们的目标，我们首先更新PSR J1907 $+$ 0602的星历，这是用来帮助消除任何可能的污染，由于强烈的发射，从附近的脉冲星。根据我们的分析，2FGL J1906.5 $+$ 0720在$\sim$ 1~GeV处有一个显著的低能截止（14 $σ$-18 $σ$显著性），与在年轻恒星中观察到的一致。我们寻找脉动，但在0.5- 32赫兹的频率范围内没有发现自旋频率信号。没有一个单一的模型可以完全描述源的整体\fermi \ $γ$射线谱，其原因是在$\geq$ 4 GeV的能量下检测到过量的发射。当把2FGL J1906.5 $+$ 0720看作是一颗年轻的脉冲星时，高能量的成分可能表明来自脉冲星风星云的辐射。我们的结论是，2FGL J1906.5 $+$ 0720可能是一个脉冲星的基础上，我们已经获得的发射特性，并在其他能量的观测，以确认其脉冲星的性质。
英文摘要：
We report the results from our analysis of the \textit{Fermi} Large Area Telescope data of the \textit{Fermi} unassociated source 2FGL J1906.5$+$0720, which is a high-ranked candidate pulsar. In order to better study our target, we first update the ephemeris for PSR J1907$+$0602, which is used to help remove any possible contamination due to strong emission from this nearby pulsar. From our analysis, 2FGL J1906.5$+$0720 is confirmed to have a significant low energy cutoff at $\sim$ 1~GeV in its emission (14$σ$--18$σ$ significance), consistent with those seen in young pulsars. We search for pulsations but no spin frequency signals are found in a frequency range of 0.5--32 Hz. No single model can fully describe the source's overall \fermi\ $γ$-ray spectrum, and the reason for this is the excess emission detected at energies of $\geq$4 GeV. The high-energy component possibly indicates emission from a pulsar wind nebula, when considering 2FGL J1906.5$+$0720 as a young pulsar. We conclude that 2FGL J1906.5$+$0720 is likely a pulsar based on the emission properties we have obtained, and observations at other energies are needed in order to confirm its pulsar nature.
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