Multi-wavelength emission from the fermi bubble. II. Secondary electrons and the hadronic model of the bubble

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101373

Title:	Multi-wavelength emission from the fermi bubble. II. Secondary electrons and the hadronic model of the bubble
Authors:	高仲明;Cheng, K.-S.;Chernyshov, D. O.;Dogiel, V. A.;Ko, C.-M.
Contributors:	理學院天文研究所
Keywords:	ACCELERATION;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;BUBBLES;Collisions;COSMIC ELECTRONS;COSMIC PROTONS;COSMIC RADIO SOURCES;Emission;ENERGY LOSSES;Flux;GALAXIES;Gamma rays;MAGNETIC FIELDS;MILKY WAY;PARTICLE MODELS;PLASMA;PROTON-PROTON INTERACTIONS;Radio;RELATIVISTIC RANGE;Strength;SYNCHROTRON RADIATION;Texts;WAVELENGTHS
Date:	2015-01-20
Issue Date:	2026-04-21 14:32:01 (UTC+8)
Publisher:	IOP Publishing Ltd.;United States
Abstract:	摘要： We analyze the origin of the gamma-ray flux from the Fermi Bubbles (FBs) in the framework of the hadronic model in which gamma-rays are produced by collisions of relativistic protons with the protons of the background plasma in the Galactic halo. It is assumed in this model that the observed radio emission from the FBs is due to synchrotron radiation of secondary electrons produced by pp collisions. However, if these electrons lose their energy through synchrotron and inverse-Compton emission, the spectrum of secondary electrons will be too soft, and an additional arbitrary component of the primary electrons will be necessary in order to reproduce the radio data. Thus, a mixture of the hadronic and leptonic models is required for the observed radio flux. It was shown that if the spectrum of primary electrons is (ProQuest: Formulae and/or non-USASCII text omitted), the permitted range of the magnetic field strength is within the 2-7 mu G region. The fraction of gamma-rays produced by pp collisions can reach about 80% of the total gamma-ray flux from the FBs. If the magnetic field is <2 mu G or >7 mu G the model is unable to reproduce the data. Alternatively, the electrons in the FBs may lose their energy through adiabatic energy losses if there is a strong plasma outflow in the GC. Then, the pure hadronic model is able to reproduce characteristics of the radio and gamma-ray flux from the FBs. However, in this case the required magnetic field strength in the FBs and the power of CR sources are much higher than those following from observations. 出版者： United States 出版日期： 2015-01-20 出處： The Astrophysical journal, 2015-01, Vol.799 (1), p.112-6 資源來源： Institute of Physics Journals 識別號： ISSN: 1538-4357 識別號： ISSN: 0004-637X 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/799/1/112
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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