| Contribution from normal and starburst galaxies to the extragalactic gamma-ray background （EGRB） |
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| 作者单位： | Debbijoy Bhattacharya(Department of Physics,'Indian Institute of Science, Bangalore 560012,India;Space Astronomy & Instrumentation Division, ISRO Satellite Centre, Bangalore 560017, India);Parameswaran Sreekumar(Space Astronomy & Instrumentation Division, ISRO Satellite Centre, Bangalore 560017, India)
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| 摘 要： | The extragalactic diffuse emission at γ-ray energies has interesting cosmo-logical implications since these photons suffer little or no attenuation during their prop-agation from the site of origin. The emission could originate from either truly diffuse processes or from unresolved point sources such as AGNs, normal galaxies and starburst galaxies. Here, we examine the unresolved point source origin of the extragalactic γ-ray background emission from normal galaxies and starburst galaxies. γ-ray emission from normal galaxies is primarily coming from cosmic-ray interactions with interstellar mat-ter and radiation (～90%) along with a small contribution from discrete point sources (～10%). Starburst galaxies are expected to have enhanced supernovae activity which leads to higher cosmic-ray densities, making starburst galaxies sufficiently luminous at γ-ray energies to be detected by the current γ-ray mission (Fermi Gamma-ray Space Telescope).
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| 关 键 词： | 活动星系核 伽玛射线 宇宙射线 射线能量 太空望远镜 排放量 相互作用 星际物质 |
Contribution from normal and starburst galaxies to the extragalactic gamma-ray background (EGRB) |
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| Authors: | Debbijoy Bhattacharya Parameswaran Sreekumar |
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| Abstract: | |
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| Keywords: | galaxy general-galaxies luminosity function-galaxies starburst-gamma-rays observations |
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