Go to the content. | Move to the navigation | Go to the site search | Go to the menu | Contacts | Accessibility

| Create Account

Sottosanti, Andrea and Costantin, Denise and Bastieri, Denis and Brazzale, Alessandra Rosalba (2018) Discovering and Locating High-Energy Extra-Galactic Sources by Bayesian Mixture Modelling. [Working Paper] WORKING PAPER SERIES, 2/2018 . , PADOVA (Inedito)

Full text disponibile come:

PDF Document

Abstract (english)

Discovering and locating gamma-ray sources in the whole sky map is a declared target of the Fermi Gamma-ray Space Telescope collaboration. In this paper, we carry out an unsupervised analysis of the collection of high-energy photons accumulated by the Large Area Telescope, the principal instrument on board the Fermi spacecraft, over a period of around 7.5 years using a Bayesian mixture model. A fixed, though unknown, number of parametric components identify the extra-galactic emitting sources we are searching for, while a further component represents parametrically the dffuse gamma ray background due to both, extragalactic and galactic high energy photon emission. We determine the number of sources, their coordinates on the map and their intensities. The model parameters are estimated using a reversible jump MCMC algorithm which implements four different types of moves. These allow us to explore the dimension of the parameter space. The possible transitions remove from or add a source to the model, while leaving the background component unchanged. We furthermore present an heuristic procedure, based on the posterior distribution of the mixture weights, to qualify the nature of each detected source.

Statistiche Download
EPrint type:Working Paper
Anno di Pubblicazione:2018
Key Words:Astrostatistics, Bayesian Statistics, Finite Mixture Model, MCMC
Settori scientifico-disciplinari MIUR:Area 13 - Scienze economiche e statistiche > SECS-S/01 Statistica
Struttura di riferimento:Dipartimenti > Dipartimento di Scienze Statistiche
Codice ID:11239
Depositato il:29 May 2018 11:46
Simple Metadata
Full Metadata
EndNote Format

Download statistics

Solo per lo Staff dell Archivio: Modifica questo record