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http://hdl.handle.net/20.500.12386/24119
Titolo: | The Denoised, Deconvolved, and Decomposed Fermi gamma-ray sky | Autori: | Selig, Marco VACCA, VALENTINA Oppermann, Niels Enßlin, Torsten A. |
Data pubblicazione: | 2015 | Rivista: | POS PROCEEDINGS OF SCIENCE | Titolo del volume in cui è pubblicato il poster: | 34th International Cosmic Ray Conference (ICRC2015) | Numero: | 236 | Da pagina:: | 768 | 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. | Titolo del convegno: | 34th International Cosmic Ray Conference (ICRC2015) | Luogo del convegno: | The Hague, The Netherlands | Periodo del convegno: | 30 July- 6 August, 2015 | URI: | http://hdl.handle.net/20.500.12386/24119 | URL: | https://pos.sissa.it/236/768 | ISSN: | 1824-8039 | DOI: | 10.22323/1.236.0768 | Fulltext: | open |
È visualizzato nelle collezioni: | 3.01 Contributi in Atti di convegno |
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