Giant radio pulses (GRPs) are sporadic bursts emitted by some pulsars that last a few microseconds and are hundreds to thousands of times brighter than regular pulses from these sources. The only GRP-associated emission outside of radio wavelengths is from the Crab Pulsar, where optical emission is enhanced by a few percentage points during GRPs. We observed the Crab Pulsar simultaneously at x-ray and radio wavelengths, finding enhancement of the x-ray emission by 3.8 ± 0.7% (a 5.4σ detection) coinciding with GRPs. This implies that the total emitted energy from GRPs is tens to hundreds of times higher than previously known. We discuss the implications for the pulsar emission mechanism and extragalactic fast radio bursts.
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Origin of Spectral Bands in the Crab Pulsar Radio Emission.
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Article Synopsis
- - A new model has been developed to explain the high-frequency interpulse (HFIP) emission pattern of the Crab pulsar, suggesting that the emission bands are actually diffraction fringes influenced by the pulsar's magnetosphere acting as a diffraction screen.
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Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 252-5258, Japan.
Giant radio pulses (GRPs) are sporadic bursts emitted by some pulsars that last a few microseconds and are hundreds to thousands of times brighter than regular pulses from these sources. The only GRP-associated emission outside of radio wavelengths is from the Crab Pulsar, where optical emission is enhanced by a few percentage points during GRPs. We observed the Crab Pulsar simultaneously at x-ray and radio wavelengths, finding enhancement of the x-ray emission by 3.
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Caltech Optical Observatories, California Institute of Technology, Pasadena, CA, USA.
Since their discovery in 2007, much effort has been devoted to uncovering the sources of the extragalactic, millisecond-duration fast radio bursts (FRBs). A class of neutron stars known as magnetars is a leading candidate source of FRBs. Magnetars have surface magnetic fields in excess of 10 gauss, the decay of which powers a range of high-energy phenomena.
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