GAMMA RAYS FROM THE TYCHO SUPERNOVA REMNANT: MULTI-ZONE VERSUS SINGLE-ZONE MODELING

被引：29

作者：

Atoyan, Armen ^{[1
]}

Dermer, Charles D. ^{[2
]}

机构：

[1] Concordia Univ, Dept Math, Montreal, PQ H3G 1M8, Canada

[2] USN, Res Lab, Washington, DC 20375 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 749卷 / 02期

关键词：

diffusion; gamma rays: general; ISM: supernova remnants; radiation mechanisms: non-thermal; supernovae: individual (Tycho); LARGE-AREA TELESCOPE; PARTICLE-ACCELERATION; MAGNETIC-FIELD; COSMIC-RAYS; HIGH-ENERGY; FERMI LAT; EMISSION; SPECTRUM; SHOCK; AMPLIFICATION;

D O I：

10.1088/2041-8205/749/2/L26

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent Fermi and VERITAS observations of the prototypical Type Ia supernova remnant (SNR) Tycho have discovered gamma-rays with energies E in the range 0.4 GeV less than or similar to E less than or similar to 10 TeV. Crucial for the theory of Galactic cosmic-ray origin is whether the gamma-rays from SNRs are produced by accelerated hadrons (protons and ions) or by relativistic electrons. Here we show that strong constraints on the leptonic model imposed in the framework of the commonly used single-zone model are essentially removed if the analysis of the broadband radiation spectrum of Tycho is done in the two-zone (or, in general, multi-zone) approach, which is likely to apply to every SNR. Importantly, we show that the single-zone approach may underpredict the gamma-ray fluxes by an order of magnitude. A hadronic model can, however, also fit the detected gamma-ray spectrum. The difference between gamma-ray fluxes of hadronic and leptonic origins becomes significant only at less than or similar to 300 MeV, which could be revealed by spectral measurements of Tycho and other SNRs at these energies.

引用

页数：4

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