AI 中文总结
本研究分析费米-LAT探测的新星，发现t3是优化伽马射线探测显著性的首选时间区间，将V679 Car确认为>5σ伽马射线新星，并对伽马与光学光变曲线做互相关分析。
AI 中文摘要
2010年，费米-LAT（Fermi-LAT）意外探测到新星爆发产生的高能（GeV）伽马射线。此后有观点认为，这些系统的伽马射线产生于无碰撞非相对论性激波中。根据该理论，若光学光度的一部分是激波能量的再处理产物，那么观测到的新星光学与伽马射线光变曲线之间的相关性便自然成立。本研究通过分析费米-LAT探测到的不同时间区间的新星，将使新星探测显著性最大化的时间区间（t_gam）与新星光学爆发数据进行关联；此外，还研究了这些源在测得的t_gam值范围内是否存在共同的光学衰减规律。研究发现，在所有样本中，新星的t3（即新星V波段亮度衰减3个星等所需的时间）似乎是优化费米-LAT探测显著性的首选分析时间区间，尽管存在显著的离散性；此外，本研究将此前被认为是边缘探测伽马射线新星的源V679 Car，报告为一项>5σ的探测结果；本研究还对伽马射线与光学光变曲线进行了互相关分析。
英文摘要
High-energy (GeV) gamma-ray emission from nova eruptions was a surprise detection by the Fermi-LAT in 2010. Since then, it has been suggested that the gamma-rays from these systems are generated in collisionless non-relativistic shocks. In this theory, the observed correlation between optical and gamma-ray nova lightcurves naturally arises if a portion of the optical luminosity is reprocessed shock power. In this work, we investigate this scenario by analyzing Fermi-LAT-detected novae in varied time bins and then correlating the bin size that maximizes the nova's significance (tgam) with the nova's optical eruption data. Furthermore, we investigate whether there is a common optical decay across the sources' measured tgam values in the population. We find that across our population, a nova's $t_3$ (the time it takes the nova V band brightness to decay 3 magnitudes) appears to be the favored analysis bin that optimizes the Fermi-LAT detection significance, although there is significant spread. Additionally, we report V679 Car, a source previously noted as a marginally detected gamma-ray nova, as a $>5 σ$ detection in this work. We perform cross-correlation analysis of gamma-ray and optical lightcurves.
Comments12 pages, 3 figures, 1 table
Journal refOwen K. Henry et al 2026 ApJ 1010 45
