GLOBAL COSMIC-RAY-RELATED LUMINOSITY AND ENERGY BUDGET OF THE MILKY WAY

被引：209

作者：

Strong, A. W. ^{[1
]}

Porter, T. A. ^{[2
]}

Digel, S. W. ^{[3
,4
]}

Johannesson, G. ^{[2
]}

Martin, P. ^{[1
]}

Moskalenko, I. V. ^{[2
,4
]}

Murphy, E. J. ^{[5
]}

Orlando, E. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[2] Stanford Univ, Hansen Expt Phys Lab, Stanford, CA 94305 USA

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[4] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[5] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 722卷 / 01期

关键词：

cosmic rays; Galaxy: general; gamma rays: galaxies; gamma rays: general; radiation mechanisms: non-thermal; radio continuum: galaxies; FAR-INFRARED EMISSION; CONTINUUM GAMMA-RAYS; EDDINGTON LIMIT; DISK GALAXIES; RADIO; PROPAGATION; EXPLANATION; AL-26; MODEL; DUST;

D O I：

10.1088/2041-8205/722/1/L58

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use the GALPROP code for cosmic-ray (CR) propagation to calculate the broadband luminosity spectrum of the Milky Way related to CR propagation and interactions in the interstellar medium. This includes gamma-ray emission from the production and subsequent decay of neutral pions (pi(0)), bremsstrahlung, and inverse Compton scattering, and synchrotron radiation. The Galaxy is found to be nearly a CR electron calorimeter, but only if gamma-ray emitting processes are taken into account. Synchrotron radiation alone accounts for only one-third of the gamma-ray total electron energy losses with similar to 10%-20% of the total synchrotron emission from secondary CR electrons and positrons. The relationship between far-infrared and radio luminosity that we find from our models is consistent with that found for galaxies in general. The results will be useful for understanding the connection between diffuse emissions from radio through gamma-rays in "normal" (non-active galactic nucleus dominated) galaxies as well as for estimating the broadband extragalactic diffuse background from these kinds of galaxies.

引用

页码：L58 / L63

页数：6

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