VERITAS Search for Magnetically-Broadened Emission From Blazars
Elisa Pueschel (for the VERITAS Collaboration)
TL;DR
This paper reports on VERITAS observations searching for extended gamma-ray emission from blazars, aiming to detect effects of intergalactic magnetic fields on cascade emission, and discusses constraints on IGMF strength.
Contribution
First search using VERITAS for magnetically-broadened emission from blazars to constrain intergalactic magnetic fields.
Findings
No significant extended emission detected.
Constraints placed on IGMF strength.
Results improve previous limits on IGMF.
Abstract
A non-zero intergalactic magnetic field (IGMF) would potentially produce detectable effects on cascade emission from blazars. Depending on the strength of the IGMF, the cascade emission may be time delayed or angularly broadened compared to the blazar's primary, unscattered emission. Ground-based imaging atmospheric-Cherenkov telescopes, such as VERITAS, have the precise angular resolution needed to search for magnetically-broadened emission. We present the latest VERITAS results on the search for extended gamma-ray emission, based on observations of a number of strongly-detected TeV blazars at a range of redshifts. The consequent constraints on the strength of the IGMF are discussed.
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