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Title: H I absorption from the epoch of reionization and primordial magnetic fields

We study the impact of primordial magnetic fields on the H I absorption from the epoch of reionization. The presence of these fields results in two distinct effects: (1) the heating of the halos from the decay of the magnetic fields owing to ambipolar diffusion, and (2) an increase in the number of halos owing to additional matter fluctuations induced by magnetic fields. We analyze both of these effects and show that the latter is potentially observable because the number of halos along of line of sight can increase by many orders of magnitude. While this effect is not strongly dependent on the magnetic field strength in the range 0.3-0.6 nG, it is extremely sensitive to the magnetic field power spectral index for the near scale-free models. Therefore, the detection of such absorption features could be a sensitive probe of the primordial magnetic field and its power spectrum. We discuss the detectability of these features with the ongoing and future radio interferometers. In particular, we show that LOFAR might be able to detect these absorption features at z ≅ 10 in less than 10 hr of integration if the flux of the background source is 400 mJy.
Authors:
 [1] ;  [2]
  1. Southern Federal University, Rostov on Don 344090 (Russian Federation)
  2. Raman Research Institute, Bangalore 560080 (India)
Publication Date:
OSTI Identifier:
22356897
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 786; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; AMBIPOLAR DIFFUSION; COSMOLOGY; DECAY; DETECTION; FLUCTUATIONS; INTERFEROMETERS; MAGNETIC FIELDS; SPECTRA; UNIVERSE