AI 中文总结
基于对PSR J0435+3233约17年观测数据，通过费米大面积望远镜分析，确定其γ射线对应体，探测到γ射线脉冲，得出相关光度和效率，将其确立为γ射线毫秒脉冲星，为研究其磁层特性提供新探针。
AI 中文摘要
受近期发现的PSR J0435+3233（一颗周期导数异常大\(\dot{P}=4.9\times10^{-17}\ {\rm s\,s^{-1}}\)且自旋-down光度高\(\dot{E}=5.89\times10^{37}\ {\rm erg\,s^{-1}}\)的毫秒脉冲星）的启发，我们分析了用费米大面积望远镜对该脉冲星约17年的观测数据。我们确定编目源4FGL J0435.5+3232（距射电计时位置仅\(0.01^{\circ}\)）为PSR J0435+3233的γ射线对应体。利用在射电计时历书有效间隔内收集的γ射线事件，我们在约\(6.8\sigma\)置信水平上探测到其γ射线脉冲。在此间隔内，相位分辨分析表明脉冲发射主要集中在\(\phi\sim0.44\) - \(0.69\)的旋转相位内。我们还假设距离为1.2 kpc且各向同性发射，得出其γ射线光度为\(L_{\gamma}=6.26\times10^{32}\ {\rm erg\,s^{-1}}\)。该光度对应表观γ射线效率\(\eta_{\gamma}\sim1.1\times10^{-5}\)，尽管该脉冲星有类似年轻脉冲星的旋转能量预算，但γ射线输出极低。我们的探测将PSR J0435+3233确立为γ射线毫秒脉冲星，其高自旋-down功率和低表观γ射线效率的显著组合为研究具有极端旋转特性的毫秒脉冲星磁层中的粒子加速、辐射束流和观测几何提供了新探针。
英文摘要
Motivated by the recent discovery of PSR~J0435+3233, a millisecond pulsar with an exceptionally large period derivative of $\dot{P}=4.9\times10^{-17}\ {\rm s\,s^{-1}}$ and a high spin-down luminosity of $\dot{E}=5.89\times10^{37}\ {\rm erg\,s^{-1}}$, we analyze $\sim$17~yr of observations obtained with the \textit{Fermi} Large Area Telescope for the pulsar. We identify the cataloged source 4FGL~J0435.5+3232, located only $0.01^{\circ}$ from the radio timing position, as the $γ$-ray counterpart of PSR~J0435+3233. Using $γ$-ray events collected within the validity interval of the radio timing ephemeris, we detect its $γ$-ray pulsations at a $\sim6.8σ$ confidence level. In this interval, the phase-resolved analysis shows that the pulsed emission is concentrated predominantly within the rotational-phase of $ϕ\sim0.44$--$0.69$. We also derive its $γ$-ray luminosity of $L_γ=6.26\times10^{32}\ {\rm erg\,s^{-1}}$, assuming a distance of 1.2~kpc and isotropic emission. This luminosity corresponds to an apparent $γ$-ray efficiency of $η_γ\sim1.1\times10^{-5}$, revealing an exceptionally low $γ$-ray output despite the pulsar's young-pulsar-like rotational-energy budget. Our detection establishes PSR~J0435+3233 as a $γ$-ray MSP, and the striking combination of its high spin-down power and low apparent $γ$-ray efficiency provides a new probe of particle acceleration, radiation beaming, and viewing geometry in the magnetospheres of millisecond pulsars with extreme rotational properties.
Comments6 pages, 3 figures
