http://arxiv.org/abs/1908.10994
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 (which could be produced by the relativistic particles) from the HH 80-81 system using ten-year {\it Fermi}-LAT observations. A significant $\gamma$-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. Combining the $\gamma$-ray and previous radio observations, we may exclude the relativistic Bremsstrahlung process for the production of the $\gamma$-rays under the assumption of a magnetic field strength of 0.1 mG. $\gamma$-rays can be produced through inverse-Compton (IC) scattering of relativistic electrons or inelastic proton-proton ($pp$) interaction. The maximum energies of electrons and protons are constrained to be $<0.1\ $TeV and $\sim\ $20 GeV, respectively.
D. Yan, J. Zhou and P. Zhang
Fri, 30 Aug 19
28/58
Comments: N/A
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