20.500.12556/RUNG-2131
FERMI-LAT OBSERVATIONS OF HIGH-ENERGY γ-RAY EMISSION TOWARD THE GALACTIC CENTER
The Fermi Large Area Telescope (LAT) has provided the most detailed view to date of the emission toward the Galactic center (GC) in high-energy γ-rays. This paper describes the analysis of data taken during the first 62 months of the mission in the energy range 1–100 GeV from a 15° × 15° region about the direction of the GC. Specialized interstellar emission models (IEMs) are constructed to enable the separation of the γ-ray emissions produced by cosmic ray particles interacting with the interstellar gas and radiation fields in the Milky Way into that from the inner ∼1 kpc surrounding the GC, and that from the rest of the Galaxy. A catalog of point sources for the 15° × 15° region is self-consistently constructed using these IEMs: the First Fermi-LAT Inner Galaxy Point Source Catalog (1FIG). The spatial locations, fluxes, and spectral properties of the 1FIG sources are presented, and compared with γ-ray point sources over the same region taken from existing catalogs. After subtracting the interstellar emission and point-source contributions a residual is found. If templates that peak toward the GC are used to model the positive residual the agreement with the data improves, but none of the additional templates tried account for all of its spatial structure. The spectrum of the positive residual modeled with these templates has a strong dependence on the choice of IEM.
cosmic rays – Galaxy: center – gamma-rays: general – gamma-rays: ISM – radiation mechanisms: non-thermal
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true
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Angleški jezik
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Delo ni kategorizirano
2016-03-02 11:38:38
2016-03-02 16:39:26
2023-06-09 03:15:42
0000-00-00 00:00:00
2016
0
0
44
819
2016
0000-00-00
Zaloznikova
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
4150011
10.3847/0004-637X/819/1/44
URN:SI:UNG:REP:MIVBYH7Q
ApJ_GalacticCenter_2016.pdf
ApJ_GalacticCenter_2016.pdf
1
A2CF2F55CFEEAA21756ECDD67F21C5DF
f567539c520ec17f487b37656b52cbe67d34eb402e434b82a8dae6e261bcca02
dda5b4af-05cd-11ee-9c48-5ef991fed68f
https://repozitorij.ung.si/Dokument.php?lang=slv&id=3428
Univerza v Novi Gorici
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