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Discovery of a Spatially Extended GeV Source in the Vicinity of the TeV Halo Candidate 2HWC J1912+099: a TeV Halo or Supernova Remnant?
Zhang, Hai-Ming1,5; Xi, Shao-Qiang1,5; Liu, Ruo-Yu1,2; Xin, Yu-Liang3,4; Liu, Siming3,4; Wang, Xiang-Yu1,5
2020-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume889Issue:1Pages:6
Corresponding AuthorLiu, Ruo-Yu(ryliu@nju.edu.cn)
AbstractObservations by the High-Altitude Water Cherenkov Observatory (HAWC) and Milagro have detected spatially extended TeV sources surrounding middle-aged (t similar to 100-400 kyr) pulsars like Geminga and PSR B0656+14, which have been named "TeV halos," representing very extended TeV pulsar wind nebulae (PWNe) powered by relatively old pulsars. A few more HAWC-detected sources have been suggested to be TeV halo candidates. In this paper, we search for possible GeV counterparts of three TeV halo candidates with Fermi Large Area Telescopes. We detect a new spatially extended GeV source in the vicinity of the TeV halo candidate 2HWC J1912+099, which is also detected by the High Energy Stereoscopic System (H.E.S.S.) (HESS J1912+101). We find that the size of the GeV source is significantly larger than that of the TeV emission measured by H.E.S.S., and a spatial template characteristic of a PWN can fit the GeV data. We suggest that the GeV source is an extended PWN powered by the central middle-aged pulsar PSR J1913+1011. This discovery favors the TeV halo scenario for the TeV source 2HWC J1912+099 (HESS J1912+101), although the possible shell-like morphology measured by H.E.S.S. challenges this interpretation. Alternatively, the TeV emission could be dominated by a supernova remnant via the hadronic process. Future multi-wavelength observations of the source and more precise measurements of the spatial profile of the TeV emission will be useful to distinguish between the two scenarios.
KeywordPulsars Cosmic rays High-energy cosmic radiation
DOI10.3847/1538-4357/ab5af6
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000520584400001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35847
Collection中国科学院紫金山天文台
Corresponding AuthorLiu, Ruo-Yu
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China
2.Deutsch Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
5.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Hai-Ming,Xi, Shao-Qiang,Liu, Ruo-Yu,et al. Discovery of a Spatially Extended GeV Source in the Vicinity of the TeV Halo Candidate 2HWC J1912+099: a TeV Halo or Supernova Remnant?[J]. ASTROPHYSICAL JOURNAL,2020,889(1):6.
APA Zhang, Hai-Ming,Xi, Shao-Qiang,Liu, Ruo-Yu,Xin, Yu-Liang,Liu, Siming,&Wang, Xiang-Yu.(2020).Discovery of a Spatially Extended GeV Source in the Vicinity of the TeV Halo Candidate 2HWC J1912+099: a TeV Halo or Supernova Remnant?.ASTROPHYSICAL JOURNAL,889(1),6.
MLA Zhang, Hai-Ming,et al."Discovery of a Spatially Extended GeV Source in the Vicinity of the TeV Halo Candidate 2HWC J1912+099: a TeV Halo or Supernova Remnant?".ASTROPHYSICAL JOURNAL 889.1(2020):6.
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