年轻原恒星驱动的高能伽马射线发射：以S255 NIRS 3为例
High energy gamma-ray emission powered by a young protostar: the case of S255 NIRS 3
AI总结：
本文研究大质量原恒星S255 NIRS 3的伽马射线发射，发现Fermi-LAT源4FGL J0613.1+1749c与其射电喷流方向一致，提出该辐射可能由喷流中加速粒子通过轫致辐射或质子-质子相互作用产生。
摘要：
最近有研究报告了大质量年轻恒星体中宇宙线高效加速的证据。在这些大质量原恒星中，S255 NIRS 3是检验这一假设的最佳对象之一，已探测到与射电喷流相关的极端耀发事件。我们利用Fermi-LAT数据搜寻与该天体相关的伽马射线发射，并使用MWISP巡天在不同分子谱线中检查气体含量。一个名为4FGL J0613.1+1749c的GeV源位于该大质量年轻恒星体区域上方，其中两条约10 pc的丝状CO结构沿亚秒差距射电喷流的同一方向延伸。我们研究了该伽马射线源的能谱、形态和光变曲线，并将其与射电喷流中加速的强子群体和轻子群体所预期的理论发射进行比较。我们认为该伽马射线源可能由S255 NIRS 3喷流中加速的粒子提供能量，通过轫致辐射或质子-质子相互作用辐射，并且在轻子群体或强子群体情况下，由初级或次级电子的同步辐射分量在射电波段发光。
英文摘要：
Evidence of efficient acceleration of cosmic rays in massive young stellar objects has been recently reported. Among these massive protostars, S255 NIRS 3 for which extreme flaring events associated with radio jets have been detected, is one of the best objects to test this hypothesis. We search for gamma-ray emission associated with this object in Fermi-LAT data and inspect the gas content in different molecular lines using the MWISP survey. A GeV source dubbed 4FGL J0613.1+1749c lies on top of the MYSO region, where two filamentary ~10 pc CO structures extend along the same direction of the sub-parsec radio jets. We investigate the spectrum, morphology, and light curve of the gamma-ray source and compare it with the theoretical emission expected from hadronic and leptonic populations accelerated in the radio jets. We argue that the gamma-ray source could be powered by particles accelerated in the S255 NIRS 3 jets, radiating via Bremsstrahlung or proton-proton interaction, and with a synchrotron component shinning in radio from primary or secondary electrons in the case of a leptonic or hadronic population.
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