Unveiling the nature of the unidentified gamma-ray sources 4FGL J1908.6+0915e, HESS J1907+089/HOTS J1907+091, and 3HWC J1907+085 in the sky region of the magnetar SGR 1900+14
Abstract
Supernova remnants (SNRs), star formation regions (SFRs), and pulsar wind nebulae (PWNe) are prime candidates for Galactic PeVatrons. The non-thermal high-energy (HE, ɛ > 100 MeV) and very high-energy (VHE, ɛ > 100 GeV) γ-ray emission from these sources should be a promising manifestation of acceleration processes. We investigate the possibility to explain the HE and VHE γ-ray emission from the sky region of the magnetar SGR 1900+14 as a signature of cosmic rays accelerated in above-mentioned sources. To this end, we simulate the γ-ray emission from the extended Fermi-LAT HE source 4FGL J1908.6+0915e, the extended VHE H.E.S.S. source candidate HOTS J1907+091, and the point-like HAWC TeV source 3HWC J1907+085, which are spatially coincident with the SNR G42.8+0.6, the magnetar SGR 1900+14, and the star-forming region W49A. The simulations are performed within the hadronic and leptonic models. We show that the observed γ-ray emission from the region of the magnetar SGR 1900+14 can, in principle, include contributions of different intensities from all three types of (potentially confused) sources. The considered in detail cases of a magnetar-connected but still undetected SNR and a PWN are the most promising ones, but with a serious requirement on the energy reserve of radiated CR particles - of the order of $10^{51}d_{\textrm {10kpc}}^{2}$ erg for sources at a distance of d ~ 10 kpc. Such energy reserve can be provided by the magnetar-related hypernova and/or magnetar wind nebula remnant created by the newborn millisecond magnetar with the large supply of rotational energy Erot ~ 1052 erg.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- July 2022
- DOI:
- 10.1093/mnras/stac1304
- arXiv:
- arXiv:2009.06081
- Bibcode:
- 2022MNRAS.514..762H
- Keywords:
-
- acceleration of particles;
- radiation mechanisms: non-thermal;
- stars: magnetars;
- ISM: supernova remnants;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 13 pages, 7 figures