Very-high-energy emission from M 82

被引：70
|
作者：
Persic, M. [1 ]
Rephaeli, Y. [2 ,3 ]
Arieli, Y. [2 ,3 ]
机构：
[1] Ist Nazl Fis Nucl, I-34143 Trieste, Italy
[2] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel
[3] Univ Calif San Diego, Ctr Space Sci & Astrophys, La Jolla, CA 92093 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2008年 / 486卷 / 01期
关键词：
acceleration of particles; ISM : cosmic rays; galaxies : general; galaxies : starburst; stars : formation radiation; mechanisms : non-thermal;
D O I：
10.1051/0004-6361:200809525
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Spurred by the improved measurement sensitivity in the very-high-energy (VHE: >= 100 GeV)gamma-ray band, we assess the feasibility of detection of the nearby starburst galaxy M 82. VHE emission is expected to be predominantly from the decay of neutral pions which are produced in energetic proton interactions with ambient protons. An estimate of VHE emission from this process is obtained by an approximate, semi-quantitative calculation, and also by a detailed numerical treatment based on a convection-diffusion model for energetic electron and proton propagation and energy losses. All relevant hadronic and leptonic processes are considered, gauged by the measured synchrotron radio emission from the inner disk region. We estimate an integrated flux f (>= 100 GeV) similar to 2 x 10(-12) cm(-2) s(-1), possibly detectable by the current northern-hemisphere imaging air Cherenkov telescopes, MAGIC and VERITAS, and a good candidate for detection with the upcoming MAGIC II telescope. We also estimate f (>= 100 MeV) similar to 10(-8) cm(-2) s(-1), a level of emission that can be detected by GLAST/LAT based on the projected sensitivity for a one-year observation.
引用
收藏
页码：143 / 149
页数：7
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