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Deep observation of the giant radio lobes of Centaurus A with the Fermi Large Area Telescope
Yang, R. -Z.1,2; Sahakyan, N.3,4,5; Wilhelmi, E. de Ona1; Aharonian, F.1,6; Rieger, F.1
2012-06-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume542Pages:A19
AbstractThe detection of high-energy (HE) gamma-ray emission up to similar to 3 GeV from the giant lobes of the radio galaxy Centaurus A has been recently reported by the Fermi-LAT Collaboration based on ten months of all-sky survey observations. A data set more than three times larger is used here to study the morphology and photon spectrum of the lobes with higher statistics. The larger data set results in the detection of HE gamma-ray emission (up to similar to 6 GeV) from the lobes with a significance of more than 10 and 20 sigma for the north and the south lobe, respectively. Based on a detailed spatial analysis and comparison with the associated radio lobes, we report evidence for a substantial extension of the HE gamma-ray emission beyond the WMAP radio image for the northern lobe of Cen A. We reconstructed the spectral energy distribution (SED) of the lobes using radio (WMAP) and Fermi-LAT data from the same integration region. The implications are discussed in the context of hadronic and time-dependent leptonic scenarios.
KeywordGamma Rays: Galaxies Radiation Mechanisms: Non-thermal Galaxies: Active
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361/201118713
WOS KeywordPROBE WMAP OBSERVATIONS ; X-RAY-EMISSION ; PARTICLE-ACCELERATION ; NGC 5128 ; DISCOVERY ; GALAXY ; VIEW
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000305803300065
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7946
Collection暗物质和空间天文实验室
Affiliation1.Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Roma La Sapienza, I-00185 Rome, Italy
4.ICRANet, Dip Fis, I-00185 Rome, Italy
5.NAS Armenia, Inst Phys Res, Ashtarak 0203 2, Armenia
6.Dublin Inst Adv Studies, Dublin 2, Ireland
Recommended Citation
GB/T 7714
Yang, R. -Z.,Sahakyan, N.,Wilhelmi, E. de Ona,et al. Deep observation of the giant radio lobes of Centaurus A with the Fermi Large Area Telescope[J]. ASTRONOMY & ASTROPHYSICS,2012,542:A19.
APA Yang, R. -Z.,Sahakyan, N.,Wilhelmi, E. de Ona,Aharonian, F.,&Rieger, F..(2012).Deep observation of the giant radio lobes of Centaurus A with the Fermi Large Area Telescope.ASTRONOMY & ASTROPHYSICS,542,A19.
MLA Yang, R. -Z.,et al."Deep observation of the giant radio lobes of Centaurus A with the Fermi Large Area Telescope".ASTRONOMY & ASTROPHYSICS 542(2012):A19.
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