Title
The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope
Date Issued
01 August 2018
Access level
open access
Resource Type
journal article
Author(s)
Ackermann M.
Ajello M.
Baldini L.
Ballet J.
Barbiellini G.
Bastieri D.
Bellazzini R.
Bissaldi E.
Blandford R.D.
Bloom E.D.
Bonino R.
Bottacini E.
Brandt T.J.
Bregeon J.
Bruel P.
Buehler R.
Cameron R.A.
Caputo R.
Caraveo P.A.
Castro D.
Cavazzuti E.
Charles E.
Cheung C.C.
Chiaro G.
Ciprini S.
Cohen-Tanugi J.
Costantin D.
Cutini S.
D'Ammando F.
De Palma F.
Desai A.
Di Lalla N.
Di Mauro M.
Di Venere L.
Favuzzi C.
Finke J.
Franckowiak A.
Fukazawa Y.
Funk S.
Fusco P.
Gargano F.
Gasparrini D.
Giglietto N.
Giordano F.
Giroletti M.
Green D.
Grenier I.A.
Guillemot L.
Guiriec S.
Hays E.
Hewitt J.W.
Horan D.
Jóhannesson G.
Kensei S.
Kuss M.
Larsson S.
Latronico L.
Lemoine-Goumard M.
Li J.
Longo F.
Loparco F.
Lovellette M.N.
Lubrano P.
Magill J.D.
Maldera S.
Manfreda A.
Mazziotta M.N.
McEnery J.E.
Meyer M.
Mizuno T.
Monzani M.E.
Morselli A.
Moskalenko I.V.
Negro M.
Nuss E.
Omodei N.
Orienti M.
Orlando E.
Ormes J.F.
Palatiello M.
Paliya V.S.
Paneque D.
Perkins J.S.
Persic M.
Pesce-Rollins M.
Piron F.
Porter T.A.
Principe G.
Rainò S.
Rando R.
Rani B.
Razzaque S.
Reimer A.
Reimer O.
Reposeur T.
Sgrò C.
Siskind E.J.
Spandre G.
Spinelli P.
Suson D.J.
Publisher(s)
Institute of Physics Publishing
Abstract
We present a search for spatial extension in high-latitude (|b| > 5°) sources in recent Fermi point source catalogs. The result is the Fermi High-Latitude Extended Sources Catalog, which provides source extensions (or upper limits thereof) and likelihood profiles for a suite of tested source morphologies. We find 24 extended sources, 19 of which were not previously characterized as extended. These include sources that are potentially associated with supernova remnants and star-forming regions. We also found extended γ-ray emission in the vicinity of the Cen A radio lobes and-at GeV energies for the first time-spatially coincident with the radio emission of the SNR CTA 1, as well as from the Crab Nebula. We also searched for halos around active galactic nuclei, which are predicted from electromagnetic cascades induced by the e+e? pairs that are deflected in intergalactic magnetic fields. These pairs are produced when ?-rays interact with background radiation fields. We do not find evidence for extension in individual sources or in stacked source samples. This enables us to place limits on the flux of the extended source components, which are then used to constrain the intergalactic magnetic field to be stronger than 3 × 10?16 G for a coherence length λ ≳ 10 kpc, even when conservative assumptions on the source duty cycle are made. This improves previous limits by several orders of magnitude.
Volume
237
Issue
2
Language
English
OCDE Knowledge area
Astronomía
Subjects
Scopus EID
2-s2.0-85052388013
Source
Astrophysical Journal, Supplement Series
ISSN of the container
00670049
Sponsor(s)
1Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany 2Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634-0978, USA 3Università di Pisa and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa I-56127 Pisa, Italy 4Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d’Astrophysique, CEA Saclay, F-91191 Gif sur Yvette, France 5Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy 6Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy 7Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy 8Dipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, Italy 9Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy 10Dipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, Italy 11Istituto Nazionale di Fisica Nucleare, Sezione di Bari, I-70126 Bari, Italy 12W.W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA; mameyer@stanford.edu, mdwood@slac.stanford.edu 13Istituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino, Italy 14Dipartimento di Fisica, Università degli Studi di Torino, I-10125 Torino, Italy 15Department of Physics and Astronomy, University of Padova, Vicolo Osservatorio 3, I-35122 Padova, Italy 16NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 17Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, F-34095 Montpellier, France 18Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France 19Center for Research and Exploration in Space Science and Technology (CRESST) and NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA regina.caputo@nasa.gov 20INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via E. Bassini 15, I-20133 Milano, Italy 21Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA 22Italian Space Agency, Via del Politecnico snc, I-00133 Roma, Italy 23Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USA 24Space Science Data Center—Agenzia Spaziale Italiana, Via del Politecnico, snc, I-00133, Roma, Italy 25Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy 26INAF Istituto di Radioastronomia, I-40129 Bologna, Italy 27Dipartimento di Astronomia, Università di Bologna, I-40127 Bologna, Italy 28Università Telematica Pegaso, Piazza Trieste e Trento, 48, I-80132 Napoli, Italy 29Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan 30Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, D-91058 Erlangen, Germany 31Department of Astronomy, University of Maryland, College Park, MD 20742, USA 32Laboratoire de Physique et Chimie de l’Environnement et de l’Espace—Université d’Orléans / CNRS, F-45071 Orléans Cedex 02, France 33Station de radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, F-18330 Nançay, France 34The George Washington University, Department of Physics, 725 21st St, NW, Washington, DC 20052, USA 35University of North Florida, Department of Physics, 1 UNF Drive, Jacksonville, FL 32224, USA 36Science Institute, University of Iceland, IS-107 Reykjavik, Iceland 37KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden 38Department of Physics, KTH Royal Institute of Technology, AlbaNova, SE-106 91 Stockholm, Sweden 39The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden 40Centre d’Études Nucléaires de Bordeaux Gradignan, IN2P3/CNRS, Université Bordeaux 1, BP120, F-33175 Gradignan Cedex, France 41Institute of Space Sciences (CSICIEEC), Campus UAB, Carrer de Magrans s/n, E-08193 Barcelona, Spain 42Hiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan 43Istituto Nazionale di Fisica Nucleare, Sezione di Roma “Tor Vergata,” I-00133 Roma, Italy 44Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA 45Max-Planck-Institut für Physik, D-80805 München, Germany 46Osservatorio Astronomico di Trieste, Istituto Nazionale di Astrofisica, I-34143 Trieste, Italy 47Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa 48Institut für Astro-und Teilchenphysik and Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria 49NYCB Real-Time Computing Inc., Lattingtown, NY 11560-1025, USA 50Purdue University Northwest, Hammond, IN 46323, USA 51Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan 52CNRS, IRAP, F-31028 Toulouse cedex 4, France 53GAHEC, Universit de Toulouse, UPS-OMP, IRAP, F-31400 Toulouse, France 54Institució Catalana de Recerca i Estudis Avançats (ICREA), E-08010 Barcelona, Spain 55Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy 56California State University, Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90032, USA 57Praxis Inc., Alexandria, VA 22303, resident at Naval Research Laboratory, Washington, DC 20375, USA 58Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste, Italy 59Center for Astrophysics and Cosmology, University of Nova Gorica, Nova Gorica, Slovenia 60Institut de Physique Nucléaire, Université Paris-Sud, Univ. Paris/Saclay, 15 rue Georges Clemenceau, 91406 Orsay, Cedex, France
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