Deep observation of the giant radio lobes of Centaurus A with the Fermi Large Area Telescope

被引：4
|
作者：
Yang, Rui-zhi [1 ,2 ]
Sahakyan, Narek [3 ,4 ]
de Ona Wilhelmi, Emma [1 ,5 ]
Aharonian, Felix [1 ,6 ]
Rieger, Frank [1 ]
机构：
[1] Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany
[2] Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Peoples R China
[3] Univ Rome Sapienza, ICRANet, Dept Fis, I-00185 Rome, Italy
[4] NAS Armenia, Inst Phys Res, Yerevan, Armenia
[5] Inst CiRncies lOEspai IEEC CSIC, E-08193 Barcelona, Spain
[6] Dublin Inst Adv Studies, Dublin 2, Ireland
来源：
HIGH ENERGY GAMMA-RAY ASTRONOMY | 2012年 / 1505卷
关键词：
Gamma rays: galaxies; PROBE WMAP OBSERVATIONS;
D O I：
10.1063/1.4772329
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The detection of high-energy (HE) 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.
引用
收藏
页码：590 / 593
页数：4
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