Discovery of Gamma-ray Emission from M31 via FERMI-LAT
H. \"Ogelman, N. Aksaker, S. An{\i}lan, H. Dereli, N. Emraho\u{g}lu,, I. Yegingil
TL;DR
This study analyzed two years of FERMI-LAT data to detect gamma-ray emission from the Andromeda galaxy, finding a significant excess indicating gamma-ray activity.
Contribution
First detection of gamma-ray emission from M31 using archival FERMI-LAT data with aperture photometry analysis.
Findings
7 sigma excess in on-source apertures
Gamma-ray flux of (4.95±0.71)×10⁻⁸ photons cm⁻² s⁻¹ for E>100 MeV
No noticeable elliptical image in the data
Abstract
2 years worth of archival FERMI-LAT data was used to search for the gamma-ray emission from the Andromeda galaxy. The data show no noticeable elliptical image. Subsequent on-off source aperture photometry analysis using a CO image template show a 7 sigma excess in the number of on-source apertures in comparison to the off-source apertures, yielding a flux of (4.95+/-0.71)x10-8 photons cm-2 s-1 for E>100 MeV.
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