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2013 Fiscal Year Final Research Report

Theoretical and observational study on the origin of cosmic magnetic fields

Research Project

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Project/Area Number 23740179
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKumamoto University

Principal Investigator

TAKAHASHI Keitaro  熊本大学, 自然科学研究科, 准教授 (80547547)

Project Period (FY) 2011 – 2013
Keywords磁場 / マイクロ波背景放射 / 活動銀河核 / ガンマ線
Research Abstract

I have done theoretical and observational studies on intergalactic magnetic fields as primordial magnetic fields. I derived a theoretical prediction on primordial magnetic fields generated from primordial vector mode and a constraint on it was put from the observational data of cosmic microwave background. Lower bounds on magnetic fields, 10 to -20th Gauss, were obtained from constraints on the secondary delayed GeV gamma-rays from active galactic nuclei Mrk 501 and Mrk 421. Finally, I have developed an algorithm for Faraday tomography, which is possible for future wideband radio telescope and enable us to reconstruct the distribution of magnetic fields and polarization emissivity along the line of sight.

  • Research Products

    (10 results)

All 2013 2012 2011

All Journal Article (9 results) (of which Peer Reviewed: 9 results) Presentation (1 results)

  • [Journal Article] Constraints on the multi-lognormal magnetic fields from the observations of the cosmic microwave background and the matter power spectrum2013

    • Author(s)
      D. G. Yamazaki, K. Ichiki and K. Takahashi
    • Journal Title

      Phys. Rev. D

      Volume: 88 Pages: 103011

    • DOI

      10.1103/PhysRevD.88.103011

    • Peer Reviewed
  • [Journal Article] Lower Bounds on Magnetic Fields in Intergalactic Voids from Long-Term GeV-TeV Light Curves of the Blazar Mrk 4212013

    • Author(s)
      K. Takahashi, M. Mori, K. Ichiki, S. Inoue and H. Takami
    • Journal Title

      Astrophys. J

      Volume: 771 Pages: L42

    • DOI

      10.1088/2041-8205/771/2/L42

    • Peer Reviewed
  • [Journal Article] Constraint on the primordial vector mode and its magnetic field generation from seven-year Wilkinson Microwave Anisotropy Probe Observations2012

    • Author(s)
      K. Ichiki, K. Takahashi and N. Sugiyama
    • Journal Title

      Phys. Rev. D

      Volume: 85 Pages: 043009

    • DOI

      10.1103/PhysRevD.85.043009

    • Peer Reviewed
  • [Journal Article] Lower Bounds on Intergalactic Magnetic Fields from Simultaneously Observed GeV-TeV Light Curves of the Blazar Mkn 5012012

    • Author(s)
      K. Takahashi, M. Mori, K. Ichiki and S. Inoue
    • Journal Title

      Astrophys. J

      Volume: 744 Pages: L7

    • DOI

      10.1088/2041-8205/744/1/L7

    • Peer Reviewed
  • [Journal Article] Effects of Primordial Magnetic Field with Log-normal Distribution on Cosmic Microwave Background2011

    • Author(s)
      D. G. Yamazaki, K. Ichiki and K. Takahashi
    • Journal Title

      Phys. Rev. D

      Volume: 84 Pages: 123006

    • DOI

      10.1103/PhysRevD.84.123006

    • Peer Reviewed
  • [Journal Article] Primordial magnetic fields generated by the non-adiabatic fluctuations at pre-recombination era2011

    • Author(s)
      S. Maeda, K. Takahashi and K. Ichiki
    • Journal Title

      JCAP

      Volume: 1111 Pages: 045

    • DOI

      10.1088/1475-7516/2011/11/045

    • Peer Reviewed
  • [Journal Article] Cosmic microwave background bispectrum of tensor passive modes induced from primordial magnetic fields2011

    • Author(s)
      M. Shiraishi, D. Nitta, S. Yokoyama, K. Ichiki and K. Takahashi
    • Journal Title

      Phys. Rev. D

      Volume: 83 Pages: 123003

    • DOI

      10.1103/PhysRevD.83.123003

    • Peer Reviewed
  • [Journal Article] Computation approach for CMB bispectrum from primordial magnetic fields2011

    • Author(s)
      M. Shiraishi, D. Nitta, S. Yokoyama, K. Ichiki and K. Takahashi
    • Journal Title

      Phys. Rev. D

      Volume: 83 Pages: 123523

    • DOI

      10.1103/PhysRevD.83.123523

    • Peer Reviewed
  • [Journal Article] CMB Bispectrum from Primordial Scalar, Vector and Tensor non-Gaussianities2011

    • Author(s)
      M. Shiraishi, D. Nitta, S. Yokoyama, K. Ichiki and K. Takahashi
    • Journal Title

      Prog. Theor. Phys

      Volume: 125 Pages: 795-813

    • URL

      http://ptp.oxfordjournals.org/content/125/4/795

    • Peer Reviewed
  • [Presentation] Probing Intergalactic Magnetic Fields with Square Kilometre Array2013

    • Author(s)
      K. Takahashi
    • Organizer
      Multi-Messenger Approaches to Cosmic Rays : Origins and Space frontiers
    • Place of Presentation
      IAP, Paris, France
    • Year and Date
      2013-11-28

URL: 

Published: 2015-06-25  

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