The Denoised, Deconvolved, and Decomposed Fermi gamma-ray sky

Journal
Date Issued
2015
Author(s)
Selig, Marco
•
•
Oppermann, Niels
•
Enßlin, Torsten A.
DOI
Abstract
We analyze the 6.5 year all-sky data from the Fermi Large Area Telescope in the energy range 0.6–307.2 GeV. Raw count maps show a superposition of diffuse and point-like emission structures and are subject to shot noise and instrumental artifacts. Using the Denoising, Deconvolving, and Decomposing Photon Observations D3PO algorithm, we modeled the observed photon counts as the sum of a diffuse and a point-like photon flux, convolved with the instrumental beam and subject to Poissonian shot noise, without the use of spatial or spectral templates. The D3PO algorithm performs a Bayesian inference and yields separate estimates for the two flux components. We show that the diffuse γ-ray flux can be described phenomenologically by only two distinct components: a soft component, presumably dominated by hadronic processes, tracing the dense, cold interstellar medium, and a hard component, presumably dominated by leptonic interactions,following the hot and dilute medium and outflows such as the Fermi bubbles.
Coverage
34th International Cosmic Ray Conference (ICRC2015)
Volume
236
Start page
768
Conferenece
34th International Cosmic Ray Conference (ICRC2015)
Conferenece place
The Hague, The Netherlands
Conferenece date
30 July- 6 August, 2015
Uri
Url
Issn Identifier
1824-8039
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

Selig_proc_etal2015.pdf

Description
pdf editoriale
Size

8.19 MB

Format

Adobe PDF

Checksum (MD5)

35e8711ca6c6278e6264fbf3e14d2f0c