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- Lin, RebeccaUniversity of Toronto (author)
Resolving the Emission Regions of the Crab Pulsar’s Giant Pulses. II. Evidence for Relativistic Motion
- Article/chapterEnglish2023
Publisher, publication year, extent ...
- 2023-03-14
- American Astronomical Society,2023
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:research.chalmers.se:da924d4a-aa86-41a7-99e6-4eb3f909c1a4
- https://research.chalmers.se/publication/535158URI
- https://doi.org/10.3847/1538-4357/acba95DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- The Crab Pulsar is the prime example of an emitter of giant pulses. These short, very bright pulses are thought to originate near the light cylinder, at ∼1600 km from the pulsar. The pulsar’s location inside the Crab Nebula offers an unusual opportunity to resolve the emission regions, using the nebula, which scatters radio waves, as a lens. We attempt to do this using a sample of 61,998 giant pulses found in coherently combined European VLBI network observations at 18 cm. These were taken at times of relatively strong scattering and hence good effective resolution. From correlations between pulse spectra, we show that the giant pulse emission regions are indeed resolved. We infer apparent diameters of ∼2000 and ∼2400 km for the main and interpulse components, respectively, and show that with these sizes the correlation amplitudes and decorrelation timescales and bandwidths can be understood quantitatively, both in our observations and in previous ones. Using pulse-spectra statistics and correlations between polarizations, we also show that the nebula resolves the nanoshots that comprise individual giant pulses. The implied diameters of ∼1100 km far exceed light-travel-time estimates, suggesting the emitting plasma is moving relativistically, with γ ≃ 104, as inferred previously from drifting bands during the scattering tail of a giant pulse. If so, the emission happens over a region extended along the line of sight by ∼107 km. We conclude that relativistic motion likely is important for producing giant pulses, and may be similarly for other sources of short, bright radio emission, such as fast radio bursts.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
- NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
- NATURVETENSKAP Fysik Fusion, plasma och rymdfysik hsv//swe
- NATURAL SCIENCES Physical Sciences Fusion, Plasma and Space Physics hsv//eng
Added entries (persons, corporate bodies, meetings, titles ...)
- van Kerkwijk, Marten H.University of Toronto (author)
- Main, RobertMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
- Mahajan, NikhilUniversity of Toronto (author)
- Pen, U. L.University of Toronto,Institut canadien d'astrophysique théorique,Canadian Institute for Theoretical Astrophysics,Academia Sinica Taiwan,Perimeter Institute for Theoretical Physics (author)
- Kirsten, Franz,1983Netherlands Institute for Radio Astronomy (ASTRON),Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kfranz (author)
- University of TorontoMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG) (creator_code:org_t)
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- In:Astrophysical Journal: American Astronomical Society945:21538-43570004-637X
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