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Bow Ties in the Sky. I. The Angular Structure of Inverse Compton Gamma ray Halos in the Fermi Sky

Broderick, Avery E. and Tiede, Paul and Shalaby, Mohamad and Pfrommer, Christoph and Puchwein, Ewald and Chang, Philip and Lamberts, Astrid (2016) Bow Ties in the Sky. I. The Angular Structure of Inverse Compton Gamma ray Halos in the Fermi Sky. Astrophysical Journal, 832 (2). Art. No. 109. ISSN 0004-637X. doi:10.3847/0004-637X/832/2/109.

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Extended inverse Compton halos are generally anticipated around extragalactic sources of gamma rays with energies above 100 GeV. These result from inverse Compton scattered cosmic microwave background photons by a population of high-energy electron/positron pairs produced by the annihilation of the high-energy gamma rays on the infrared background. Despite the observed attenuation of the high-energy gamma rays, the halo emission has yet to be directly detected. Here, we demonstrate that in most cases these halos are expected to be highly anisotropic, distributing the upscattered gamma rays along axes defined either by the radio jets of the sources or oriented perpendicular to a global magnetic field. We present a pedagogical derivation of the angular structure in the inverse Compton halo and provide an analytic formalism that facilitates the generation of mock images. We discuss exploiting this fact for the purpose of detecting gamma ray halos in a set of companion papers.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Broderick, Avery E.0000-0002-3351-760X
Tiede, Paul0000-0003-3826-5648
Shalaby, Mohamad0000-0001-9625-5929
Pfrommer, Christoph0000-0002-7275-3998
Chang, Philip0000-0002-2137-2837
Lamberts, Astrid0000-0001-8740-0127
Additional Information:© 2016 The American Astronomical Society. Received 2016 July 15; revised 2016 August 31; accepted 2016 September 1; published 2016 November 21. AEB receives financial support from the Perimeter Institute for Theoretical Physics and the Natural Sciences and Engineering Research Council of Canada through a Discovery Grant. Research at the Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Research and Innovation. CP acknowledges support from the European Research Council under ERC-CoG Grant CRAGSMAN-646955 and by the Klaus Tschira Foundation. PC gratefully acknowledges support from the NASA ATP program through NASA Grant NNX13AH43G, and NSF Grant AST-1255469. AL receives financial support from an Alfred P. Sloan Research Fellowship, NASA ATP Grant NNX14AH35G, and NSF Collaborative Research Grant 411920 and CAREER Grant 1455342. EP acknowledges support from the Kavli Foundation.
Funding AgencyGrant Number
Perimeter Institute for Theoretical PhysicsUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Industry CanadaUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
European Research Council (ERC)CRAGSMAN-646955
Klaus Tschira FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Kavli FoundationUNSPECIFIED
Subject Keywords:BL Lacertae objects: general – gamma-rays: diffuse background – gamma-rays: general – infrared: diffuse background – plasmas – radiation mechanisms: nonthermal
Issue or Number:2
Record Number:CaltechAUTHORS:20161121-092417259
Persistent URL:
Official Citation:Avery E. Broderick et al 2016 ApJ 832 109
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72191
Deposited By: Tony Diaz
Deposited On:21 Nov 2016 19:23
Last Modified:11 Nov 2021 04:57

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