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Detection of Gamma-Rays from the Protostellar Jet in the HH 80-81 System

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arxiv 1908.10994 v4 pith:5NOXQ2CG submitted 2019-08-29 astro-ph.HE

Detection of Gamma-Rays from the Protostellar Jet in the HH 80-81 System

classification astro-ph.HE
keywords gammasystemdetectionemissionfoundgamma-raysprotostellarsignificant
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Considering that the existence of relativistic particles in the protostellar jet has been confirmed by the detection of linearly polarized radio emission from the HH 80-81 jet, we search for gamma-rays from the HH 80-81 system using ten-year {\it Fermi}-LAT observations. A significant point-like $\gamma$-ray excess is found in the direction of the HH 80-81 system with Test-Statistic (TS) value $>$100, which is likely produced in the HH 80-81 jet. The $\gamma$-ray spectrum extends only to 1 GeV with a photon index of 3.5. No significant variability is found in the gamma-ray emission. It is discussed that the properties of HH 80-81 jet suffice for producing the observed $\gamma$-rays.

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