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Title: Reionization constraints on primordial magnetic fields
Authors: Pandey, Kanhaiya L.
Choudhury, Roy T.
Sethi, S.K.
Ferrara, A.
Keywords: intergalactic medium
dark ages
Issue Date: 1-Aug-2015
Publisher: Oxford University Press for the RAS
Citation: Monthly Notices of the Royal Astronomical Society , 2015, Vol. 451, p 1692-1700
Abstract: We study the impact of the extra density fluctuations induced by primordial magnetic fields on the reionization history in the redshift range: 6 < z < 10. We perform a comprehensive Markov chain Monte Carlo (MCMC) physical analysis allowing the variation of parameters related to primordial magnetic fields (strength, B0, and power-spectrum index nB ), reionization and Λ cold dark matter cosmological model. We find that magnetic field strengths in the range: B0 ≃ 0.05–0.3 nG (for nearly scale-free power spectra) can significantly alter the reionization history in the above redshift range and can relieve the tension between the Wilkinson Microwave Anisotropy Probe and quasar absorption spectra data. Our analysis puts upper limits on the magnetic field strength B0 < 0.358, 0.120 and 0.059 nG (95 per cent c.l.) for nB=−2.95,−2.9 and −2.85 , respectively. These represent the strongest magnetic field constraints among those available from other cosmological observables.
Description: Open Access
ISSN: 1365-2966 - (online)
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Copyright: 2015 The authors & the Royal Astronomical Society.
Appears in Collections:Research Papers (A&A)

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