170 research outputs found
Limits on the Emission of Gamma Rays from M31 (The Andromeda Galaxy) with HAWC
The detection of the Fermi Bubbles suggests that spiral galaxies such as the
Milky Way can undergo active periods. Using gamma-ray observations, we can
investigate the possibility that such structures are present in other nearby
galaxies. We have analyzed the region around the Andromeda Galaxy (Messier
Catalog M31) for signs of bubble-like emission using TeV gamma-ray data
recorded by the High-Altitude Water Cherenkov Observatory. We fit a model
consisting of two 6 kpc bubbles symmetric about and perpendicular to the M31
galactic plane and assume a power-law distribution for the gamma-ray flux. We
compare the emission from these bubble regions to that expected from structures
similar to the Fermi Bubbles found in the Milky Way. No significant emission
was observed. We report upper limits on the TeV flux from Fermi Bubble
structures in M31.Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017),
Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution
- …