Hitomi X-ray studies of Giant Radio Pulses from the Crab pulsar

Abstract

To search for giant X-ray pulses correlated with the giant radio pulses (GRPs) from the Crab pulsar, we performed a simultaneous observation of the Crab pulsar with the X-ray satellite Hitomi in the 2 -- 300 keV band and the Kashima NICT radio observatory in the 1.4 -- 1.7 GHz band with a net exposure of about 2 ks on 25 March 2016, just before the loss of the Hitomi mission.The timing performance of the Hitomi instruments was confirmed to meet the timing requirement and about 1,000 and 100 GRPs were simultaneously observed at the main and inter-pulse phases, respectively, and we found no apparent correlation between the giant radio pulses and the X-ray emission in either the main or inter-pulse phases.All variations are within the 2 sigma fluctuations of the X-ray fluxes at the pulse peaks, and the 3 sigma upper limits of variations of main- or inter- pulse GRPs are 22\% or 80\% of the peak flux in a 0.20 phase width, respectively, in the 2 -- 300 keV band.The values become 25\% or 110\% for main or inter-pulse GRPs, respectively, when the phase width is restricted into the 0.03 phase.Among the upper limits from the Hitomi satellite, those in the 4.5-10 keV and the 70-300 keV are obtained for the first time, and those in other bands are consistent with previous reports.Numerically, the upper limits of main- and inter-pulse GRPs in the 0.20 phase width are about (2.4 and 9.3) $\times 10^{-11}$ erg cm${}^{-2}$, respectively. No significant variability in pulse profiles implies that the GRPs originated from a local place within the magnetosphere and the number of photon-emitting particles temporally increases.However, the results do not statistically rule out variations correlated with the GRPs, because the possible X-ray enhancement may appear due to a $>0.02$\% brightening of the pulse-peak flux under such conditions.

18 pages, 7 figure, 6 tables, accepted for publication in PASJ

References in corpus (13)

• A bright millisecond radio burst of extragalactic origin
• TEMPO2, a new pulsar timing package. I: Overview
• The direct localization of a fast radio burst and its host
• The Quiescent Intracluster Medium in the Core of the Perseus Cluster
• Discovery of a transient gamma-ray counterpart to FRB 131104
• Statistical properties of giant pulses from the Crab pulsar
• On generation of Crab giant pulses
• Correlation of the scattering and dispersion events in the Crab Nebula pulsar
• In-orbit performance of the soft X-ray imaging system aboard Hitomi (ASTRO-H)
• Correlation of Fermi photons with high-frequency radio giant pulses from the Crab pulsar
• A Blind Search for Prompt Gamma-ray Counterparts of Fast Radio Bursts with Fermi-LAT Data
• Wide-Band Spectra of Giant Radio Pulses from the Crab Pulsar
• Very Long Baseline Interferometry Experiment on Giant Radio Pulses of Crab Pulsar toward Fast Radio Burst Detection

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• Enhanced X-ray Emission Coinciding with Giant Radio Pulses from the Crab Pulsar
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• In-flight Calibration of Hitomi Soft X-ray Spectrometer (3) Effective Area
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• NICER observations of the Crab pulsar glitch of 2017 November
• Statistics of VHE gamma-Rays in Temporal Association with Radio Giant Pulses from the Crab Pulsar
• Are Pulsar Giant Pulses Induced by Re-emission of Cyclotron Resonance Absorption?
• A simple, flexible method for timing cross-calibration of space missions
• Stimulated-emission based model of fast radio bursts
• Multi-wavelength Polarimetry of Isolated Neutron Stars