NDLI: Giant lobes of Centaurus A as seen in radio and γ-ray images obtained with the Fermi-LAT and Planck satellites

Content Provider	EDP Sciences
Author	Xiao-na Sun Rui-zhi Yang Benjamin Mckinley Felix Aharonian
Abstract	The γ-ray data of Fermi-LAT on the giant lobes of Centaurus A are analysed together with the high frequency radio data obtained with the Planck satellite. The large γ-ray photon statistics, accumulated during seven years of observations, and the recently updated Fermi-LAT collaboration software tools allow substantial extension of the detected γ-ray emission towards higher energy, up to 30 GeV, and lower energy, down to 60 MeV. Moreover, the new γ-ray data allow us to explore the spatial features of γ-ray emission of the lobes. For the north lobe, we confirm, with higher statistical significance, our earlier finding on the extension of γ-ray emission beyond the radio image. Moreover, the new analysis reveals significant spatial variation of γ-ray spectra from both lobes. On the other hand, the Planck observations at microwave frequencies contain important information on spectra of synchrotron emission in the cutoff region, and thus allow model-independent derivation of the strength of the magnetic field and the distribution of relativistic electrons based on the combined γ-ray and radio data. The interpretation of multiwavelength spectral energy distributions of the lobes within a pure leptonic model requires strong enhancement of the magnetic field at the edge of the south lobe. Alternatively, a more complex, leptonic-hadronic model of the γ-ray emission, postulating a non-negligible contribution of the π^{0^{-decay component at highest energies, can explain the γ-ray data with a rather homogeneous distribution of the magnetic field over the giant lobes.}}
Page Count	10
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2016/11/aa29069-16/aa29069-16.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	595
DOI	10.1051/0004-6361/201629069
Language	English
Publisher	EDP Sciences
Publisher Date	2016-11-01
Access Restriction	Open
Rights Holder	© ESO, 2016
Subject Keyword	gamma rays: galaxies galaxies: clusters: individual: Centaurus A radiation mechanisms: non-thermal gamma rays: galaxies / galaxies: clusters: individual: Centaurus A / radiation mechanisms: non-thermal
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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