Parity-odd correlators of diffuse gamma-rays and intergalactic magnetic fields

Hiroyuki Tashiro, Tanmay Vachaspati

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We develop the connection between intergalactic helical magnetic fields and parity-odd signatures in the diffuse gamma-ray sky. We find that the location and the amplitude of a peak in a parity-odd correlator, Q(R), can be used to infer the normal and helical power spectra of the intergalactic magnetic field. When applied to Fermi-LAT data, the amplitude of the observed peak in Q(R) gives ~10-14 G intergalactic magnetic field strength, which is consistent with an earlier independent estimate that only used the peak location (Tashiro et al. 2014).We discuss features in the observed Q(R) that further support the intergalactic magnetic field hypothesis and make predictions for future tests.

Original languageEnglish (US)
Pages (from-to)299-306
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Mar 21 2015


  • Diffuse radiation
  • gamma-rays: diffuse background

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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