Detection of $gamma$-rays from the Protostellar Jet in the HH 80-81 System. (arXiv:1908.10994v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Yan_D/0/1/0/all/0/1">Dahai Yan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhou_J/0/1/0/all/0/1">Jianeng Zhou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_P/0/1/0/all/0/1">Pengfei Zhang</a>

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. In theory, the HH
80-81 jet can produce the observed $gamma$-rays.

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. In theory, the HH
80-81 jet can produce the observed $gamma$-rays.

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