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SUMMARY:Tracing the origin of magnetic fields in galaxies - Sergio Martin
DTSTART:20191030T134500Z
DTEND:20191030T141500Z
UID:TALK130369@talks.cam.ac.uk
CONTACT:Catrina Diener
DESCRIPTION:Magnetic fields are one of the most fascinating puzzles in the
  picture of galaxy formation. Recognised important throughout many astroph
 ysical scenarios\, they often stand as a major source of uncertainty. In g
 alaxy evolution\, one of the major unknowns is which mechanisms generate m
 icroGauss magnetic fields in the ISM. Three main alternative pictures stan
 d as possible drivers of their evolution: either magnetic field are of str
 ong primordial origin\; amplified by dynamos\; or produced by stars or AGN
  and subsequently fed to the ISM\, and possibly further out into the inter
 galactic medium\, polluting the cosmic magnetic field. While each picture 
 appears self-sufficient\, current studies struggle to shed light on how th
 ese different mechanisms interact or whether one dominates over the others
 .\n\nI present in this talk our first scientific results using our new alg
 orithm designed to answer these questions by following how magnetic fields
  from different origins co-evolve. I apply the code to a cosmic zoom-in MH
 D RAMSES simulation where magnetic fields are sourced simultaneously as an
  ab-initio primordial field and by magnetised stellar feedback to study th
 e origin of galactic magnetic fields. The two sources are followed separat
 ely. I discuss which magnetic source dominates the energy budget in the ga
 laxy and in different parts of its ISM. I review some signatures of these 
 fields and how the stellar-generated field pollutes the primordial magneti
 c field in the environment.
LOCATION:Sackler Lecture Theatre\, IoA
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