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

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

Journal Article · Fri Nov 20 04:00:00 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.

OSTI ID:: 22521910

Journal Information:: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 814; ISSN ASJOAB; ISSN 0004-637X

Country of Publication:: United States

Language:: English

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