Table · dataset · 2025
Abell 655 radio images
Listed in IVOA Registry (Virtual Observatory)
Some galaxy clusters contain non-thermal synchrotron emitting plasma permeating the intracluster medium (ICM).
Description
The spectral properties of this radio emission are not well characterized at decameter wavelengths ({nu}<30MHz), primarily due to the severe corrupting effects of the ionosphere. Using a recently developed calibration strategy, we present LOFAR images below 30MHz of the low mass galaxy cluster Abell 655, which was serendipitously detected in an observation of the bright calibrator 3C 196.
We combine this observation with LOFAR data at 144MHz, and new Band 4 Giant Metrewave Radio Telescope observations centered at 650MHz. In the 15-30MHz LOFAR image, diffuse emission is seen with a physical extent of about 700kpc. We argue that the diffuse emission detected in this galaxy cluster likely has multiple origins.
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At higher frequencies (650MHz), the diffuse emission resembles a radio halo, while at lower frequencies the emission seems to consist of several components and bar-like structures. It suggests that most low-frequency emission in this cluster comes from re-energized fossil plasma from old AGN outbursts, coexisting with the radio halo component. By counting the number of cluster radio detections in the decameter band, we estimate that around a quarter of the Planck clusters host re-energised fossil plasma that is detectable in the decameter band with LOFAR.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A99 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...693A..99G ui.adsabs.harvard.edu/abs/2025A%26A...693A..99G ↗
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/693/a99 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Image 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/693/a99 | 12 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 (75%) |
| 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 |