Gamma-ray image reconstruction of the Andromeda galaxy

被引：5
作者：
Armand, Celine [1 ,2 ,3 ]
Calore, Francesca [1 ]
机构：
[1] Univ Grenoble Alpes, USMB, CNRS, LAPTh, F-74000 Annecy, France
[2] Univ Grenoble Alpes, USMB, CNRS, LAPP, F-74000 Annecy, France
[3] Univ Geneva, Astron Dept, Chemin Ec 16, CH-1290 Versoix, Switzerland
来源：
PHYSICAL REVIEW D | 2021年 / 103卷 / 08期
关键词：
GALACTIC-CENTER EXCESS; LARGE-AREA TELESCOPE; DARK-MATTER; STELLAR MASS; EMISSION; M31; DISTANCE; HALO; ALGORITHM; SIGNAL;
D O I：
10.1103/PhysRevD.103.083023
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyze about 12 years of Fermi-LAT data in the direction of the Andromeda galaxy (M31). We robustly characterize its spectral and morphological properties against systematic uncertainties related to the modeling of the Galactic diffuse emission. We perform this work by adapting and exploiting the potential of the SkyFACT adaptive template fitting algorithm. We reconstruct the gamma-ray image of M31 in a template-independent way, and we show that flat spatial models are preferred by data, indicating an extension of the gamma-ray emission of about 0.3-0.4 degrees for the bulge of M31. This study also suggests that a second component, extending to at least 1 degrees, contributes to the observed total emission. We quantify systematic uncertainties related to mismodeling of Galactic foreground emission at the level of 2.9%.
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页数：15
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