Contribution of star-forming galaxies to the cosmic gamma-ray background
- Date
- November 14 (Fri) 14:00 - 15:15, 2025 (JST)
- Speaker
-
- Junling Chen (Ph.D. Student, Graduate School of Mathematical Sciences, The University of Tokyo)
- Language
- English
- Host
- Shigehiro Nagataki
Fermi Gamma-Ray Space Telescope has measured the diffuse extragalactic gamma-ray background (EGB) radiation in the energy range of 100 MeV to 820 GeV. Several candidate γ -ray sources have been proposed as the candidate components of the unresolved EGB, including active galactic nuclei (AGNs), millisecond pulsars, dark matter annihilation, and star-forming galaxies (SFGs), but their quantitative contribution has not yet been precisely determined. In this talk, I will introduce our latest physical model describing the gamma-ray emission mechanism from SFGs, and our estimate of the contribution of SFGs based on careful calibration with gamma-ray luminosities of nearby galaxies and physical quantities (star formation rate, stellar mass, and size) of galaxies observed by high-redshift galaxy surveys.
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