Particle acceleration and magnetic field amplification in massive young stellar object jets

0547589 - ASÚ 2022 RIV GB eng J - Journal Article
Araudo, Anabella - Padovani, M. - Marcowith, A.
Particle acceleration and magnetic field amplification in massive young stellar object jets.
Monthly Notices of the Royal Astronomical Society. Roč. 504, č. 2 (2021), s. 2405-2419. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA ČR(CZ) GA20-19854S
Institutional support: RVO:67985815
Keywords : acceleration of particles * radiation mechanisms * non-thermalshock waves
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.235, year: 2021
Method of publishing: Limited access
https://doi.org/10.1093/mnras/stab635

We study diffusive shock acceleration and magnetic field amplification in protostellar jets with speeds between 300 and 1500 km s(-1). We show that the magnetic field in the synchrotron emitter can be amplified by the non-resonant hybrid (Bell) instability excited by the cosmic ray streaming. By combining the synchrotron data with basic theory of Bell instability we estimate the magnetic field in the synchrotron emitter and the maximum energy of protons. Protons can achieve maximum energies in the range 0.04-0.65 TeV and emit gamma rays in their interaction with matter fields. We predict detectable levels of gamma rays in IRAS 16547-5247 and IRAS 16848-4603. The gamma ray flux can be significantly enhanced by the gas mixing due to Rayleigh-Taylor instability. The detection of this radiation by the Fermi satellite in the GeV domain and the forthcoming Cherenkov Telescope Array at higher energies may open a new window to study the formation of massive stars, as well as diffusive acceleration and magnetic field amplification in shocks with velocities of about 1000 km s(-1).
Permanent Link: http://hdl.handle.net/11104/0323802