ICRC2015

July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Constraints on the extragalactic magnetic fields from the NVSS Faraday rotation measures

Aug 4, 2015, 4:00 PM
1h
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 178
Poster contribution CR-TH

Speaker

Maxim Pshirkov (Moscow State University)

Description

Extragalactic magnetic fields remain extremely elusive. Non-observation of cascade gamma-rays from VHE sources imply that there is a lower bound on their strength $B_{min}\sim10^{-17}$ G. The upper bound could be larger than $10^{-8}$ G. Magnetic fields of such strength could considerably alter the process of UHECR propagation, increasing deflection of proton UHECRs and even introducing so-called 'magnetic horizons' for heavier nuclei. In this work we have used rotation measures of the sources with known redshift from the NVSS catalogue. Redshift evolution of their intrinsic RMs could have been caused by extragalactic fields. Absence of any clear-cut evolution thus allowed us to constrain strength of the extragalactic magnetic fields at several nGs.
Registration number following "ICRC2015-I/" 798 -- not specified --

Primary author

Maxim Pshirkov (Moscow State University)

Co-authors

Dr Federico Urban (Universite Libre de Bruxelles) Peter Tinyakov (Universite Libre de Bruxelles (ULB))