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

• Published in: arXiv.org 2022-06
• Main Authors: Hnatyk, B, Hnatyk, R, Zhdanov, V, Voitsekhovskyi, V
• Format: Article
• Language: English
• Subjects: Computer simulation; Cosmic rays; Elastic scattering; Emission analysis; Energy; Gamma emission; Gamma rays; High energy astronomy; Magnetars; Pions; Supernova remnants
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2009.06081

Supernova remnants (SNRs), star formation regions (SFRs), and pulsar wind nebulae (PWNe) are prime candidates for Galactic PeVatrons. The nonthermal high-energy (HE, \(\varepsilon>100 \textrm{ MeV}\)) and very high-energy (VHE, \(\varepsilon>100 \textrm{ GeV}\)) \(\gamma\)-ray emission from these sources should be a promising manifestation of acceleration processes. We investigate the possibility to explain the HE and VHE \(\gamma\)-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 \(\gamma\)-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 \(\gamma\)-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 order of \(10^{51}d_{\textrm{10kpc}}^{2}\) erg for sources at a distance of \(d\sim 10\) 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 \(E_{\textrm{rot}}\sim 10^{52}\textrm{ erg}\).