WIDE-BAND SPECTRA of GIANT RADIO PULSES from the CRAB PULSAR

Ryo Mikami, Katsuaki Asano, Shuta J. Tanaka, Shota Kisaka, Mamoru Sekido, Kazuhiro Takefuji, Hiroshi Takeuchi, Hiroaki Misawa, Fuminori Tsuchiya, Hajime Kita, Yoshinori Yonekura, Toshio Terasawa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We present the results of the simultaneous observation of giant radio pulses (GRPs) from the Crab pulsar at 0.3, 1.6, 2.2, 6.7, and 8.4 GHz with four telescopes in Japan. We obtain 3194 and 272 GRPs occurring at the main pulse and the interpulse phases, respectively. A few GRPs detected at both 0.3 and 8.4 GHz are the most wide-band samples ever reported. In the frequency range from 0.3 to 2.2 GHz, we find that about 70% or more of the GRP spectra are consistent with single power laws and their spectral indices are distributed from -4 to -1. We also find that a significant number of GRPs have such a hard spectral index (approximately -1) that the fluence at 0.3 GHz is below the detection limit ("dim-hard" GRPs). Stacking light curves of such dim-hard GRPs at 0.3 GHz, we detect consistent enhancement compared to the off-GRP light curve. Our samples show apparent correlations between the fluences and the spectral hardness, which indicates that more energetic GRPs tend to show softer spectra. Our comprehensive studies on the GRP spectra are useful materials to verify the GRP model of fast radio bursts in future observations.

Original languageEnglish
Article number212
JournalAstrophysical Journal
Volume832
Issue number2
DOIs
Publication statusPublished - 2016 Dec 1

Keywords

  • pulsars: individual (B0531+21)
  • radio continuum: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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