Detection of the Extended γ-Ray Emission from the New Supernova Remnant G321.3-3.9 with Fermi-LAT

被引：0

作者：

Guo, Xiaolei ^{[1
]}

Liu, Xi ^{[1
]}

机构：

[1] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 975卷 / 02期

基金：

中国国家自然科学基金;

关键词：

COSMIC-RAY; HESS OBSERVATIONS; SNR PUPPIS; TELESCOPE; ACCELERATION; ELECTRONS; DISCOVERY; CLOUDS;

D O I：

10.3847/1538-4357/ad87d1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With the 15 yr of Pass 8 data recorded by the Fermi Large Area Telescope, we report the detection of an extended gigaelectronvolt emission component with a 68% containment radius of 0.degrees 85, which is spatially associated with the newly identified supernova remnant (SNR) G321.3-3.9. The gamma-ray spectrum is best described by a log-parabola model in the energy range of 100 MeV-1 TeV, which shows a significant spectral curvature at similar to 1 GeV. Either a leptonic or a hadronic model could explain the multiwavelength data of G321.3-3.9, while the leptonic model predicts a too-low strength of magnetic field. Also considering the flat radio spectrum of G321.3-3.9 and the gamma-ray upper limit in the low energy band, the hadronic model is favored. The spatial coincidence between the gamma-ray morphology and the diffuse thermal X-ray emission of G321.3-3.9 and the curved gigaelectronvolt gamma-ray spectrum make G321.3-3.9 similar to the typical middle-aged SNRs interacting with molecular clouds (MCs). Such characteristics provide further evidence of the potential hadronic origin for its gamma-ray emission. However, there is no MC detected around G321.3-3.9, which challenges the hadronic model.

引用

页数：7

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