CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS

Finke, Justin D.; Reyes, Luis C.; Reynolds, Kaeleigh; Georganopoulos, Markos; McCann, Kevin; Ajello, Marco

doi:10.1088/0004-637X/814/1/20

Title: CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS

Journal Article · Fri Nov 20 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/814/1/20· OSTI ID:22521910

Finke, Justin D. ^[1]; Reyes, Luis C.; Reynolds, Kaeleigh ^[2]; Georganopoulos, Markos; McCann, Kevin ^[3]; Ajello, Marco ^[4]

U.S. Naval Research Laboratory, Code 7653, 4555 Overlook Ave. SW, Washington, DC 20375-5352 (United States)
Department of Physics, California Polytechnic State University, San Luis Obispo, CA 93401 (United States)
Department of Physics and Center for Space Sciences and Technology, University of Maryland Baltimore County, Baltimore, MD 21250 (United States)
Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634-0978 (United States)

Distant BL Lacertae objects emit γ-rays that interact with the extragalactic background light (EBL), creating electron–positron pairs, and reducing the flux measured by ground-based imaging atmospheric Cherenkov telescopes (IACTs) at very-high energies (VHE). These pairs can Compton-scatter the cosmic microwave background, creating a γ-ray signature at slightly lower energies that is observable by the Fermi Large Area Telescope (LAT). This signal is strongly dependent on the intergalactic magnetic field (IGMF) strength (B) and its coherence length (L{sub B}). We use IACT spectra taken from the literature for 5 VHE-detected BL Lac objects and combine them with LAT spectra for these sources to constrain these IGMF parameters. Low B values can be ruled out by the constraint that the cascade flux cannot exceed that observed by the LAT. High values of B can be ruled out from the constraint that the EBL-deabsorbed IACT spectrum cannot be greater than the LAT spectrum extrapolated into the VHE band, unless the cascade spectrum contributes a sizable fraction of the LAT flux. We rule out low B values (B ≲ 10{sup −19} G for L{sub B} ≥ 1 Mpc) at >5σ in all trials with different EBL models and data selection, except when using >1 GeV spectra and the lowest EBL models. We were not able to constrain high values of B.

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OSTI ID:: 22521910

Journal Information:: Astrophysical Journal, Vol. 814, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X

Country of Publication:: United States

Language:: English

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Gamma-rays from Blazars and the Extragalactic Background Light Costamante, Luigi arXiv https://doi.org/10.48550/arxiv.1309.0612	text	January 2013
Relativistic Pair Beams from TeV Blazars: A Source of Reprocessed GeV Emission rather than IGM Heating Sironi, Lorenzo; Giannios, Dimitrios arXiv https://doi.org/10.48550/arxiv.1312.4538	text	January 2013
A Three-Year Multi-Wavelength Study of the Very High Energy Gamma-ray Blazar 1ES 0229+200 Aliu, E.; Archambault, S.; Arlen, T. arXiv https://doi.org/10.48550/arxiv.1312.6592	text	January 2013
A Joint Analysis of BICEP2/Keck Array and Planck Data Collaborations, Planck; Ade, P. A. R.; Aghanim, N. arXiv https://doi.org/10.48550/arxiv.1502.00612	text	January 2015
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New limits on the density of the extragalactic background light in the optical to the far-infrared from the spectra of all known TeV blazars Mazin, Daniel; Raue, Martin arXiv https://doi.org/10.48550/arxiv.astro-ph/0701694	text	January 2007
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The COBE Diffuse Infrared Background Experiment Search for the Cosmic Infrared Background: I. Limits and Detections Hauser, M. G.; Arendt, R. G.; Kelsall, T. arXiv https://doi.org/10.48550/arxiv.astro-ph/9806167	text	January 1998

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Title: CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS

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