Table · dataset · 2025
EVLA and LOFAR images of Crab Nebula
Listed in IVOA Registry (Virtual Observatory)
We present International LOw Frequency ARray (LOFAR) Telescope (ILT) observations of the Crab Nebula, the remnant of a core-collapse supernova explosion observed by astronomers in 1054.
Description
The field of the Crab Nebula was observed between 120 and 168MHz as part of the LOFAR Two Meter Sky Survey (LoTSS), and the data were re-processed to include the LOFAR international stations to create a high angular resolution (0.43"x0.28") map at a central frequency of 145MHz.
Combining the ILT map with archival centimeter-range observations of the Nebula with the Very Large Array (VLA) and LOFAR data at 54MHz, we become sensitive to the effects of free-free absorption against the synchrotron emission of the pulsar wind nebula. This absorption is caused by the ionised filaments visible in optical and infrared data of the Crab Nebula, which are the result of the pulsar wind nebula expanding into the denser stellar ejecta that surrounds it and forming Rayleigh-Taylor fingers.
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The LOFAR observations are sensitive to two components of these filaments: their dense cores, which show electron densities of >=1000cm^-3^, and the diffuse envelopes, with electron densities of ~50-250cm^-3^. The denser structures have widths of ~0.03pc, whereas the diffuse component is at one point as large as 0.2pc. The morphology of the two components is not always the same.
These finding suggests that the layered temperature, density, and ionisation structure of the Crab optical filaments extends to larger scales than previously considered.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A319 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...699A.319A ui.adsabs.harvard.edu/abs/2025A%26A...699A.319A ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/699/a319 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Image 65%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/699/a319 | 11 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (65%) |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |