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Identification of point sources in gamma rays using U-shaped convolutional neural networks and a data challenge
Pontificia Univ Catolica Chile, Ave Vicuna Mackenna 4860, Macul, Region Metropol, Chile..
Univ Nova Gorica, Ctr Astrophys & Cosmol, Vipayska 13, Nova Gorica 5000, Slovenia.;Univ Grenoble Alpes, USMB, CNRS, LAPTh, F-74000 Annecy, France..
Radboud Univ Nijmegen, High Energy Phys, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands..
Radboud Univ Nijmegen, High Energy Phys, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands.;Nikhef, Sci Pk 105, NL-1098 XG Amsterdam, Netherlands..
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2021 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 656, p. A62-, article id A62Article in journal (Refereed) Published
Abstract [en]

Context. At GeV energies, the sky is dominated by the interstellar emission from the Galaxy. With limited statistics and spatial resolution, accurately separating point sources is therefore challenging. Aims. Here we present the first application of deep learning based algorithms to automatically detect and classify point sources from gamma-ray data. For concreteness we refer to this approach as AutoSourceID. Methods. To detect point sources, we utilized U-shaped convolutional networks for image segmentation and k-means for source clustering and localization. We also explored the Centroid-Net algorithm, which is designed to find and count objects. Using two algorithms allows for a cross check of the results, while a combination of their results can be used to improve performance. The training data are based on 9.5 years of exposure from The Fermi Large Area Telescope (Fermi-LAT) and we used source properties of active galactic nuclei (AGNs) and pulsars (PSRs) from the fourth Fermi-LAT source catalog in addition to several models of background interstellar emission. The results of the localization algorithm are fed into a classification neural network that is trained to separate the three general source classes (AGNs, PSRs, and FAKE sources). Results. We compared our localization algorithms qualitatively with traditional methods and find them to have similar detection thresholds. We also demonstrate the robustness of our source localization algorithms to modifications in the interstellar emission models, which presents a clear advantage over traditional methods. The classification network is able to discriminate between the three classes with typical accuracy of similar to 70%, as long as balanced data sets are used in classification training. We published online our training data sets and analysis scripts and invite the community to join the data challenge aimed to improve the localization and classification of gamma-ray point sources.

Place, publisher, year, edition, pages
EDP Sciences , 2021. Vol. 656, p. A62-, article id A62
Keywords [en]
catalogs, gamma rays: general, astroparticle physics, methods: numerical, methods: data analysis, techniques: image processing
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-306860DOI: 10.1051/0004-6361/202141193ISI: 000725877600001Scopus ID: 2-s2.0-85121036912OAI: oai:DiVA.org:kth-306860DiVA, id: diva2:1624607
Note

QC 20220104

Available from: 2022-01-04 Created: 2022-01-04 Last updated: 2024-03-18Bibliographically approved

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Johannesson, Gudlaugur

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