论文标题
新的红带毫秒脉冲星4FGL J1910.7-5320的多波长观测值
Multi-Wavelength Observations Of A New Redback Millisecond Pulsar 4FGL J1910.7-5320
论文作者
论文摘要
我们介绍了对未识别的费米大面积望远镜（LAT）源的多波长观测的研究，4FGL J1910.7-5320，这是一种新的候选候选型毫秒毫秒二元。在4FGL J1910.7-5320的4FGL 95％误差区域中，我们通过SOAR望远镜发现了Catalina实时瞬态调查（CRTS）的二进制二进制二进制，并从CATALINA实时瞬态调查（CRTS）进行了8.36 hr轨道周期。 Trapum Project最近将这种光源独立地作为回溯脉冲星发现，证实了我们的预测。我们使用黑体模型拟合4FGL J1910.7-5320的光谱能量分布，通过假设伴侣填充其Roche-lobe，其半径为R = 0.7R_SUN，可以推断出4.1 kpc的最大距离。使用12.6 ks chandra X射线观察，我们确定了4FGL J1910.7-5320的X射线对应物，其光谱可以由吸收的幂律具有1.0 +//- 0.4的光子指数来描述。频谱硬X射线发射显示轨道变异性的暂定证据。使用超过12年的Fermi-LAT数据，我们完善了γ射线源的位置，光学候选者仍然位于68％的位置误差圈中。除4FGL J1910.7-5320外，我们还找到了一个可变光源，其周期性信号在4FGL目录内部的4FGL目录95％误差区域内另一个未识别的Fermi源，4FGL J2029.5-4237。但是，γ射线源在11.7 ks Chandra观察中没有显着的X射线对应物，其3-σ通量上限为2.4*10^-14 ERG CM^-2 S^-1（0.3-7 keV）。此外，光源不在我们更新的Fermi-LAT 95％误差圈之外。这些观察性的事实都表明，这种新的红带毫秒脉冲星为γ射线源4FGL J1910.7-5320提供动力，而4FGL J2029.5-4237不太可能与4.28 hr变量相对应。
We present the study of multi-wavelength observations of an unidentified Fermi Large Area Telescope (LAT) source, 4FGL J1910.7-5320, a new candidate redback millisecond pulsar binary. In the 4FGL 95% error region of 4FGL J1910.7-5320, we find a possible binary with a 8.36-hr orbital period from the Catalina Real-Time Transient Survey (CRTS), confirmed by optical spectroscopy using the SOAR telescope. This optical source was recently independently discovered as a redback pulsar by the TRAPUM project, confirming our prediction. We fit the optical spectral energy distributions of 4FGL J1910.7-5320 with a blackbody model, inferring a maximum distance of 4.1 kpc by assuming that the companion fills its Roche-lobe with a radius of R = 0.7R_sun. Using a 12.6 ks Chandra X-ray observation, we identified an X-ray counterpart for 4FGL J1910.7-5320, with a spectrum that can be described by an absorbed power-law with a photon index of 1.0+/-0.4. The spectrally hard X-ray emission shows tentative evidence for orbital variability. Using more than 12 years of Fermi-LAT data, we refined the position of the γ-ray source, and the optical candidate still lies within the 68% positional error circle. In addition to 4FGL J1910.7-5320, we find a variable optical source with a periodic signal of 4.28-hr inside the 4FGL catalog 95% error region of another unidentified Fermi source, 4FGL J2029.5-4237. However, the γ-ray source does not have a significant X-ray counterpart in a 11.7 ks Chandra observation, with a 3-σ flux upper limit of 2.4*10^-14 erg cm^-2 s^-1 (0.3-7 keV). Moreover, the optical source is outside our updated Fermi-LAT 95% error circle. These observational facts all suggest that this new redback millisecond pulsar powers the γ-ray source 4FGL J1910.7-5320 while 4FGL J2029.5-4237 is unlikely the γ-ray counterpart to the 4.28-hr variable.
