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2020天文年會
中研院天文所 國際會議廳

論文摘要

Characterising the contribution of star-forming galaxies to the extragalactic gamma-ray background

[ Oral ]

Ellis Owen (NTHU)

Star-forming galaxies would presumably be environments rich in energetic cosmic rays due to the presence of massive stars and their remnants. Stellar remnants can supply seed particles and generate the shocks (via supernova explosions and other violent events) needed to accelerate the seeds to very high energies. These can interact to deposit energy into their environment, or to drive gamma-ray emission. In this talk, I will outline how the gamma-ray emission from these galaxies contributes to the extragalactic gamma-ray background, and discuss how the signatures that would emerge in the background power spectrum could be used to probe the redshift evolution of star-forming galaxy populations. I will also outline the prospects and limitations for observing these signatures with current and future facilities.