Wide-Band Spectra of Giant Radio Pulses from the Crab Pulsar

Abstract

We present the results of the simultaneous observation of the 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 the spectral indices of them 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.

19 pages, 25 figures, accepted for publication in ApJ

References in corpus (15)

• A bright millisecond radio burst of extragalactic origin
• TEMPO2, a new pulsar timing package. I: Overview
• Radio Emission Signatures in the Crab Pulsar
• A fast radio burst in the direction of the Carina dwarf spheroidal galaxy
• The Crab Pulsar at Centimeter Wavelengths: I. Ensemble Characteristics
• On generation of Crab giant pulses
• Bright Giant Pulses from the Crab Nebula Pulsar: Statistical Properties, Pulse Broadening and Scattering due to the Nebula
• Correlation of the scattering and dispersion events in the Crab Nebula pulsar
• A broadband radio study of the average profile and giant pulses from PSR B1821-24A
• Giant Radio Pulses from the Crab Pulsar
• Correlation of Fermi photons with high-frequency radio giant pulses from the Crab pulsar
• The variability of the Crab Nebula in radio: No radio counterpart to gamma-ray flares
• Observations of Giant Pulses from Pulsar PSR B0950+08 using LWA1
• Avalanche Photon Cooling by Induced Compton Scattering: Higher-Order Kompaneets Equation
• Electric Field Screening with Back-Flow at Pulsar Polar Cap

Cited by in corpus (2)

• Spectral Flattening at Low Frequencies in Crab Giant Pulses
• Enhanced X-ray Emission Coinciding with Giant Radio Pulses from the Crab Pulsar