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Supernova remnants (SNRs) are the most attractive candidates for the acceleration sites of Galactic cosmic rays. We report the detection of GeV $\gamma$-ray emission with the Pass 8 events recorded by Fermi Large Area Telescope (Fermi-LAT)…

High Energy Astrophysical Phenomena · Physics 2016-01-29 Yu-Liang Xin , Yun-Feng Liang , Xiang Li , Qiang Yuan , Si-Ming Liu , Da-Ming Wei

We present multiwavelength studies of a TeV gamma-ray source VER J2016+371 suggested to be associated with a supernova remnant CTB 87 (G74.9+1.2) and based on X-ray and radio morphologies, CTB 87 is identified as an evolved pulsar wind…

High Energy Astrophysical Phenomena · Physics 2018-03-08 Lab Saha

CTB 80 (G69.0+2.7) is a relatively old (50--80 kyr) supernova remnant (SNR) with a complex radio morphology showing three extended radio arms and a radio and X-ray nebula near the location of the pulsar PSR B1951+32. We report on a study of…

High Energy Astrophysical Phenomena · Physics 2021-01-20 M. Araya , C. Herrera

We report the likely GeV $\gamma$-ray emission from the composite supernova remnant (SNR) COMP G327.1+1.1 by analyzing $\sim$12.2 years of the \textit{Fermi} Large Area Telescope (\textit{Fermi}-LAT) Pass 8 data. We found the features of…

High Energy Astrophysical Phenomena · Physics 2021-05-19 Yunchuan Xiang , Yi Xing , Zejun Jiang

We first report GeV $\gamma$-ray emission from supernova remnant (SNR) G15.9+0.2 in this work. The results show that its power-law spectral index is 2.94$\pm$0.25 with a 6.47$\sigma$ significance level, and the $\gamma$-ray emission can be…

High Energy Astrophysical Phenomena · Physics 2021-10-27 Yunchuan Xiang , Zejun Jiang , Mengyao Tang

The middle-aged supernova remnant (SNR) CTB 37A is known to interact with several dense molecular clouds through the detection of shocked ${\rm H_{2}}$ and OH 1720 MHz maser emission. In the present work, we use eight years of $\textit…

High Energy Astrophysical Phenomena · Physics 2020-06-24 Soheila Abdollahi , Jean ballet , Yasushi Fukazawa , Hideaki Katagiri , Benjamin Condon

Analysis of gamma-ray emission from the supernova remnant G78.2+2.1 ($\gamma$ Cygni) with 7.2 years of cumulative data from the Fermi-LAT telescope shows a distinct hard, bright and extended component to the north of the shell coincident…

High Energy Astrophysical Phenomena · Physics 2016-07-27 Nissim Fraija , Miguel Araya

We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) onboard the \emph{Fermi} Gamma-ray Space Telescope. An investigation of the relationship among…

High Energy Astrophysical Phenomena · Physics 2015-05-30 LAT Collaboration

We report the detection of GeV $\gamma$-ray emission from supernova remnant HESS J1731-347 using 9 years of {\it Fermi} Large Area Telescope data. We find a slightly extended GeV source in the direction of HESS J1731-347. The spectrum above…

High Energy Astrophysical Phenomena · Physics 2018-01-31 Xiao-Lei Guo , Yu-Liang Xin , Neng-Hui Liao , Qiang Yuan , Wei-Hong Gao , Yi-Zhong Fan

Using $5.4$ year Fermi-LAT data, we report the detection of GeV $\gamma$-ray emission from the shell-type supernova remnant RCW 86 (G315.4-2.3) with a significance of $\sim5.1\sigma$. The data slightly favors an extended emission of this…

High Energy Astrophysical Phenomena · Physics 2014-06-18 Qiang Yuan , Xiaoyuan Huang , Siming Liu , Bing Zhang

With almost 15 years of data taken by the Large Area Telescope (LAT) onboard the Fermi satellite we discovered an extended source of GeV emission in the region of the very-high-energy (TeV) source 1LHAASO J1945+2424. This TeV source is more…

High Energy Astrophysical Phenomena · Physics 2023-12-05 Miguel Araya , J. A. Álvarez-Quesada

The supernova remnant (SNR) G51.26+0.11 was recently discovered and little is known about its properties and environment. Using data from the \emph{Fermi} Large Area Telescope we study the GeV emission seen in the direction of G51.26+0.11…

High Energy Astrophysical Phenomena · Physics 2021-11-17 Miguel Araya

A novel $\gamma$-ray supernova remnant (SNR) G206.9+2.3 is first reported in this study. We arrived at this conclusion after analyzing 12.4 years of observation data of the Fermi Large Area Telescope (Fermi-LAT). The photon flux of the…

High Energy Astrophysical Phenomena · Physics 2021-05-21 Yunchuan Xiang , Zejun Jiang

Hadron emission from supernova remnant (SNR)-molecular cloud (MC) association systems has been widely regarded as a probe of the shock-accelerated cosmic-ray protons. Here, we report on the detection of a {\gamma}-ray emission source, with…

High Energy Astrophysical Phenomena · Physics 2015-08-19 Bing Liu , Yang Chen , Xiao Zhang , Gao-Yuan Zhang , Yi Xing , Thomas G. Pannuti

The pulsar wind nebula CTB 87 (G74.9+1.2) is one of the sources emitting $\gamma$-rays with energies higher than 10 TeV, as measured by the Very Energetic Radiation Imaging Telescope Array System telescope (VERITAS). In this study, we…

High Energy Astrophysical Phenomena · Physics 2025-02-06 Gong Yunlu , Zhou Liancheng , Xia Qi , Zhang Haiyun , Fang Jun , Zhang Li

We report the detection of high-energy $\gamma$-ray emission in the vicinity of G172.8+1.5, which is debated as a Supernova remnant (SNR) or an ionized hydrogen (H$_{\rm{II}}$) region. Using 16-yr Pass 8 data from Fermi Large Area Telescope…

High Energy Astrophysical Phenomena · Physics 2025-10-03 Yuan Li , Gwenael Giacinti , Siming Liu

We report the discovery of an unidentified, extended source of very-high-energy (VHE) gamma-ray emission, VER J2019+407, within the radio shell of the supernova remnant SNR G78.2+2.1, using 21.4 hours of data taken by the VERITAS gamma-ray…

It is difficult to distinguish hadronic process from the leptonic one in $\gamma$-ray observation, which is however crucial in revealing the origin of cosmic rays. As an endeavor in the regard, we focus in this work on the complex…

High Energy Astrophysical Phenomena · Physics 2022-06-08 Xiao Zhang , Yang Chen , Fa-xiang Zheng , Qian-cheng Liu , Ping Zhou , Bing Liu

In this paper, we report the first extended GeV $\gamma$-ray emission, at a significant level of $\sim$ 8.13$\sigma$, from the region of the supernova remnant (SNR) SNR G317.3-0.2 by analyzing $\sim$ 12.2 years of Fermi Large Area Telescope…

High Energy Astrophysical Phenomena · Physics 2021-04-21 Yunchuan Xiang , Zejun Jiang , Yunyong Tang

CTB 109 is a middle-aged shell-type SNR with bright thermal X-ray emission. We reanalyze the GeV $\gamma$-ray emission from CTB 109 using thirteen years of Pass 8 data recorded by the Fermi Large Area Telescope (Fermi-LAT). The $\gamma$-ray…

High Energy Astrophysical Phenomena · Physics 2022-12-19 Yuliang Xin , Qizhen Zhao , Xiaolei Guo
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