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The Circinus Galaxy Revisited with 10 yr Fermi-LAT Data
Guo, Xiao-Lei1,2; Xin, Yu-Liang1; Liao, Neng-Hui1,3; Fan, Yi-Zhong1,2
2019-11-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume885Issue:2Pages:8
Corresponding AuthorLiao, Neng-Hui(nhliao@gzu.edu.cn)
AbstractThe Circinus galaxy is a nearby composite starburst/active galactic nucleus (AGN) system. In this work we re-analyze the GeV emission from Circinus with 10 yr of Fermi-LAT Pass 8 data. In the energy range of 1?500 GeV, the spectrum can be well fitted by a power-law model with a photon index of ?;=;2.20;;0.14, and its photon flux is (5.90;;1.04);;10(?10) photons cm(?2) s(?1). Our 0.1?500 GeV flux is several times lower than that reported in previous literature, which is roughly in compliance with the empirical relation for star-forming and Local Group galaxies and might be reproduced by the interaction between cosmic rays and the interstellar medium. The ratio between the ?-ray luminosity and the total infrared luminosity is near the proton calorimetric limit, indicating that Circinus may be a proton calorimeter. However, marginal evidence for variability of the ?-ray emission is found in the timing analysis, which may indicate the activity of an AGN jet. More Fermi-LAT data and future observation of CTA are required to fully reveal the origin of its ?-ray emission.
Keywordgalaxies: active galaxies: individual (Circinus galaxy) gamma rays: galaxies gamma rays: general radiation mechanisms: non-thermal
DOI10.3847/1538-4357/ab44ba
WOS KeywordGAMMA-RAY EMISSION ; LARGE-AREA TELESCOPE ; STAR-FORMATION ; RADIO-CONTINUUM ; DISCOVERY ; REGION ; GAS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000499882600001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35248
Collection中国科学院紫金山天文台
Corresponding AuthorLiao, Neng-Hui
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210023, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Guizhou Univ, Dept Phys & Astron, Coll Phys, Guiyang 550025, Guizhou, Peoples R China
Recommended Citation
GB/T 7714
Guo, Xiao-Lei,Xin, Yu-Liang,Liao, Neng-Hui,et al. The Circinus Galaxy Revisited with 10 yr Fermi-LAT Data[J]. ASTROPHYSICAL JOURNAL,2019,885(2):8.
APA Guo, Xiao-Lei,Xin, Yu-Liang,Liao, Neng-Hui,&Fan, Yi-Zhong.(2019).The Circinus Galaxy Revisited with 10 yr Fermi-LAT Data.ASTROPHYSICAL JOURNAL,885(2),8.
MLA Guo, Xiao-Lei,et al."The Circinus Galaxy Revisited with 10 yr Fermi-LAT Data".ASTROPHYSICAL JOURNAL 885.2(2019):8.
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