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Studies on the Anomalous Rotation Observed in Millisecond Pulsars

Research Project

Project/Area Number 07640358
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionRIKKYO UNIVERSITY

Principal Investigator

SHIBAZAKI Noriaki  RIKKYO UNIV..DEPT.of SCIENCE・ASSIST.PROF., 理学部, 助教授 (50206124)

Co-Investigator(Kenkyū-buntansha) HOUSHI Reiun  RIKKYO UNIV..DEPT.of SCIENCE・PROF, 理学部, 教授 (70062601)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordsneutron stars / pulsars / superfluid / frictional instability / braking index / グリッチ / 減速指数 / 摩擦不安定性 / 状態方程式
Research Abstract

The millisecond pulsar 1620-26 in the globular cluster M4 exhibits an unusually large second derivative of the pulse frequency, which togethr with the other pulse timing parameters yields a braking index of 4*10^7. Shibazaki and Mochizuki (1995, ApJ 438,288) have suggested a frictional instability in the crust-superfluid coupling, which sets in below a critical temperature, as a possible cause for this extreme behavior of the pulsar rotation. We have conducted numerical calculations for the thermal and rotational evolution of old neutron stars after being recycled in order to examine this suggestion. We confirm that the rapid growth in internal friction between the crust and the superfluid, caused by frictional instability, can produce an extremely large second derivative in the crust-rotation rate, as observed in PSR 1620-26. We obtain omega_<cr>-10 rad s^<-1> and I_s-3.6*10^<43> g cm^2 respectively for the critical angular-velocity difference and the moment of inertia of the inner crust superfluid from a comparison of our results with the timing parameters observed in PSR 1620-26. These values for omega_<cr> and I_s are in the range expected in current models. We find that a strong pinning region is required in the inner crust in order to explain OMEGA_c of PSR 1620-26.

Report

(3 results)
  • 1997 Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] N.Shibazaki and S.Hirano: "Application of an Internal Friction Model to an Anomalous Behavior of the Pulsar Rotation Observed in PSR 1620-26" Publ.Astron.Soc.Japan. 47. 445-449 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Asai, D.Dotani, K.Mitsuda, R.Hoshi et al.: "ASCA Observations of Soft X-Ray Transients in Quiescence" Publ.Astron.Soc.Japan. 48. 257-263 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Murata and N.Shibazaki: "Interaction of Jets with a Supernova Remnant in the SS433/W50 System" Publ.Astron.Soc.Japan. 48. 819-825 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tanaka and N.Shibazaki: "X-Ray Novae" Annu.Rev.Astron.Astrophys.34. 607-644 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Hirano, N.Shibazaki, H.Umeda and K.Nomoto: "Thermal Response of a Neutron Star to a Glitch" Astrophys.J.491. 286-295 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] R.Hoshi: "Low Luminosity Accretion Disks" X-Ray Imaging and Spectroscopy of Cosmic Hot Plasmas,ed.F.Makino,K.Mitsuda(Universal Academy Press,Inc.Tokyo). 469-470 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Shibazai and S.Hirano: "Application of an Internal Friction Model to an Anomalous Behavior of the Pulsar Rotation Observed in PSR 1620-26" Publ.Astron.Soc.Japan. 47. 445-449 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Asai, D.Dotani, K.Mitsuda, R.Hoshi, et al.: "ASCA Observation of Soft X-Ray Transients in Quiescence" Publ.Astron.Soc.Japan. 48. 257-263 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Murata and N.Shibazaki: "Interaction of Jets with a Supernova Remnant in the SS433/W50 System" Publ.Astron.Soc.Japan. 48. 819-825 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tanaka and N.Shibazaki: "X-Ray Novae" Annu.Rev.Astron.Astrophys.34. 607-644 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Hirano, N.Shibazaki, H.Umeda and K.Nomoto: "Thermal Response of a Neutron Star to a Glitch" Astrophys.J.491. 286-295 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] R.Hoshi: "Low Luminosity Accretion Disks" X-Ray Imaging and Spectroscopy of Cosmic Hot Plasmas, eds.F.Makino, K.Mitsuda (Universal Academy Press, Inc.Tokyo). 469-470 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Tanaka: "X-Ray Novae" Annu.Rev.Astron.Astrophys.34. 607-644 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K.Murata: "Interaction of Jets with a Supernove Remnant in the SS 433/W50 System" Publ.Astron.Soc.Japan. 48. 819-825 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K.Asai: "ASCA observations of soft X-ray transients in quiescence : X1608-52 and Cen X-4" Publ.Astron.Soc.Japan. 48. 257-263 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.Hoshi: "Low-Luminosity Accretion Disks" Proceedings of X-Ray Imaging and Spectroscopy of cosmic Hot Plasmas,ed.F.Makino and K.Mitsuda(Tokyo,Universal Academy Press). 469-470 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] N. Shibazaki & S. Hirano: "Application of an Internal Friction to an Anomalous Behavior of the Pulsar Rotation Observed in PSR 1620-26" Publ. Astron. Soc. Japan. 47. 445-449 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Tanaka & N. Shibazaki: "X-Ray Novae" Ann. Rev. Astron. Astrophys.34(印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] K. Asai et al(R. Hoshi): "ASCA Observations of Soft X-Ray Transients in Quiescence: X1608-52 and Cen X-4" Publ. Astron. Soc. Japan. 48(印刷中). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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