Probing intergalactic intergalactic magnetic fields with LOFAR LoTSS DR2 data

arXiv (Cornell University)

Abstract

We use Faraday rotation measurements from the latest catalog LoTSS DR2 from LOFAR to probe intergalactic magnetic fields. To identify the extragalactic component of the observed rotation measure (RM) we use two different techniques: residual rotation measure (RRM) and close radio pairs. For the RRM approach, we conclude that, despite smaller measurement errors in the LOFAR data, robust and conservative treatment of the systematic uncertainties in the Galactic contribution to RM results in the constraint on a homogeneous volume-filling magnetic field at the level 2.4 nG, slightly weaker than previous constraints from NVSS data, and does not allow to probe the presence of over-magnetized bubbles predicted by the AGN feedback model of the IllustrisTNG. Analyzing close radio pairs we found that in only 0.5% of our mock realizations of observed data, the expected contribution from the over-magnetized bubbles does not exceed LoTSS DR2 data.

Authors 4

1. Kyrylo Bondarenko

   Nordic Institute for Theoretical Physics · Stockholm University · KTH Royal Institute of Technology

   Affiliation as printed

   Nordita , KTH Royal Institute of Technology and Stockholm University , Hannes Alfvéns väg 12 , 10691 Stockholm , Sweden

   Nordita

2. Alexey Mikhajlovich Boyarsky Aachen Institute Lorentz Leiden U

   Leiden University

   Affiliation as printed

   Institute Lorentz , Leiden University , Niels Bohrweg 2 , Leiden , NL-2333 CA , the Netherlands

   Leiden U

3. Anastasia Sokolenko

   Fermi National Accelerator Laboratory · University of Chicago

   Affiliation as printed

   Kavli Institute for Cosmological Physics , The University of Chicago , Chicago , IL 60637 , USA

   Theoretical Astrophysics Department , Fermi National Accelerator Laboratory , Batavia , Illinois , 60510 , USA

   Chicago U., KICP

   Fermilab

4. Ievgen Vovk

   Institute for Cosmic Ray Research · The University of Tokyo

   Affiliation as printed

   Institute for Cosmic Ray Research , The University of Tokyo , 5-1-5 Kashiwa-no-Ha , Kashiwa City , Chiba , 277-8582 , Japan

   Tokyo U., ICRR