Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope
CTB 109 is a middle-aged shell-type supernova remnant (SNR) with bright thermal X-ray emission. We reanalyze the GeV γ -ray emission from CTB 109 using 13 yr of Pass 8 data recorded by the Fermi Large Area Telescope. The γ -ray emission of CTB 109 shows a center bright morphology, which is well cons...
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| Format: | Article |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acac89 |
| _version_ | 1827827839742771200 |
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| author | Yuliang Xin Qizhen Zhao Xiaolei Guo |
| author_facet | Yuliang Xin Qizhen Zhao Xiaolei Guo |
| author_sort | Yuliang Xin |
| collection | DOAJ |
| description | CTB 109 is a middle-aged shell-type supernova remnant (SNR) with bright thermal X-ray emission. We reanalyze the GeV γ -ray emission from CTB 109 using 13 yr of Pass 8 data recorded by the Fermi Large Area Telescope. The γ -ray emission of CTB 109 shows a center bright morphology, which is well consistent with its thermal X-ray emission rather than the shell-type structure in the radio band. The spectral analysis shows an evident spectral curvature at ∼several GeV for the GeV γ -ray spectrum, which can naturally explain the lack of TeV γ -ray emission from CTB 109. Although either a leptonic or a hadronic model could fit the multiwavelength observations of CTB 109, the hadronic model is favored considering its γ -ray morphology and the spectral curvature of the GeV spectrum. The unusual γ -ray spectrum of CTB 109 with other SNRs and the luminosity-diameter squared relation make CTB 109 distinguished both from the young-aged SNRs with hard GeV γ -ray spectra and several old-aged SNRs interacting with molecular clouds. |
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| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:37:12Z |
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| spelling | doaj.art-ebebef2f27654c3897889e7154a3b26b2023-09-03T13:08:36ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194314610.3847/1538-4357/acac89Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area TelescopeYuliang Xin0https://orcid.org/0000-0001-5135-5942Qizhen Zhao1Xiaolei Guo2School of Physical Science and Technology, Southwest Jiaotong University , Chengdu 610031, People's Republic of China ; ylxin@swjtu.edu.cn, xlguo@swjtu.edu.cnSchool of Physical Science and Technology, Southwest Jiaotong University , Chengdu 610031, People's Republic of China ; ylxin@swjtu.edu.cn, xlguo@swjtu.edu.cnSchool of Physical Science and Technology, Southwest Jiaotong University , Chengdu 610031, People's Republic of China ; ylxin@swjtu.edu.cn, xlguo@swjtu.edu.cnCTB 109 is a middle-aged shell-type supernova remnant (SNR) with bright thermal X-ray emission. We reanalyze the GeV γ -ray emission from CTB 109 using 13 yr of Pass 8 data recorded by the Fermi Large Area Telescope. The γ -ray emission of CTB 109 shows a center bright morphology, which is well consistent with its thermal X-ray emission rather than the shell-type structure in the radio band. The spectral analysis shows an evident spectral curvature at ∼several GeV for the GeV γ -ray spectrum, which can naturally explain the lack of TeV γ -ray emission from CTB 109. Although either a leptonic or a hadronic model could fit the multiwavelength observations of CTB 109, the hadronic model is favored considering its γ -ray morphology and the spectral curvature of the GeV spectrum. The unusual γ -ray spectrum of CTB 109 with other SNRs and the luminosity-diameter squared relation make CTB 109 distinguished both from the young-aged SNRs with hard GeV γ -ray spectra and several old-aged SNRs interacting with molecular clouds.https://doi.org/10.3847/1538-4357/acac89Supernova remnantsGamma-ray astronomyGamma-ray sources |
| spellingShingle | Yuliang Xin Qizhen Zhao Xiaolei Guo Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope The Astrophysical Journal Supernova remnants Gamma-ray astronomy Gamma-ray sources |
| title | Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope |
| title_full | Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope |
| title_fullStr | Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope |
| title_full_unstemmed | Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope |
| title_short | Revision of the γ-Ray Emission from SNR CTB 109 with the Fermi Large Area Telescope |
| title_sort | revision of the γ ray emission from snr ctb 109 with the fermi large area telescope |
| topic | Supernova remnants Gamma-ray astronomy Gamma-ray sources |
| url | https://doi.org/10.3847/1538-4357/acac89 |
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