Energy-Dependent Morphological Study of HESS J1857+026 with Fermi-LAT

Guo, Xiaolei; Xin, Y.

doi:10.22323/1.395.0627

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) 2021

DOI: 10.22323/1.395.0627

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Energy-Dependent Morphological Study of HESS J1857+026 with Fermi-LAT

Xiaolei Guo¹,

Y. Xin²

Abstract: is an extended gamma-ray source discovered by H.E.S.S., and considered to be a pulsar wind nebula candidate associated with PSR J1856+0245. Taking advantage of 11 years of Fermi-LAT data, we re-analyze the GeV gamma-ray emission from HESS J1857+026, and find that the GeV emission from this region is composed of two gamma-ray sources. The harder component Src T is coincident with HESS J1857+026, nevertheless the origin of the soft component Src A need further exploration. We present the results of energy-depend… Show more

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2022

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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

Hnatyk

Жданов

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Supernova remnants (SNRs), star formation regions (SFRs), and pulsar wind nebulae (PWNe) are prime candidates for Galactic PeVatrons. The nonthermal high-energy (HE, ϵ > 100 MeV) and very high-energy (VHE, ϵ > 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 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.

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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

Hnatyk

Жданов

et al. 2022

Monthly Notices of the Royal Astronomical Society

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show abstract

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Energy-Dependent Morphological Study of HESS J1857+026 with Fermi-LAT

Cited by 1 publication

References 36 publications

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

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

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