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- W2904401583 abstract "The Andromeda Galaxy is the closest spiral galaxy to us and has been the subject of numerous studies. It harbors a massive dark matter (DM) halo which may span up to ~600 kpc across and comprises ~90% of the galaxy's total mass. This halo size translates into a large diameter of 42 degrees on the sky for an M31-Milky Way (MW) distance of 785 kpc, but its presumably low surface brightness makes it challenging to detect with gamma-ray telescopes. Using 7.6 years of Fermi Large Area Telescope (Fermi-LAT) observations, we make a detailed study of the gamma-ray emission between 1-100 GeV towards M31's outer halo, with a total field radius of 60 degrees centered at M31, and perform an in-depth analysis of the systematic uncertainties related to the observations. We use the cosmic ray (CR) propagation code GALPROP to construct specialized interstellar emission models (IEMs) to characterize the foreground gamma-ray emission from the MW, including a self-consistent determination of the isotropic component. We find evidence for an extended excess that appears to be distinct from the conventional MW foreground, having a total radial extension upwards of ~120-200 kpc from the center of M31. We discuss plausible interpretations of the excess emission but emphasize that uncertainties in the MW foreground, and in particular, modeling of the H I-related components, have not been fully explored and may impact the results. This study was first presented in a poster at the 8th International Fermi Symposium. The article describing the full analysis is under preparation and will be published elsewhere." @default.
- W2904401583 created "2018-12-22" @default.
- W2904401583 creator A5036894717 @default.
- W2904401583 creator A5060680372 @default.
- W2904401583 creator A5064467756 @default.
- W2904401583 creator A5071481475 @default.
- W2904401583 date "2019-07-30" @default.
- W2904401583 modified "2023-09-27" @default.
- W2904401583 title "<i>Fermi</i>-LAT Observations of <i>γ</i>-Ray Emission toward the Outer Halo of M31" @default.
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