Table · dataset · 2019
3C 294 NIR images and optical spectra
Listed in IVOA Registry (Virtual Observatory)
High redshift radio galaxies are among the most massive galaxies at their redshift, are often found in the centers of proto-clusters of galaxies, and are expected to evolve into the present day massive central cluster galaxies.
Description
Thus they are a useful tool to explore structure formation in the young Universe. 3C 294 is a powerful FR II type radio galaxy at z=1.786. Past studies have identified a clumpy structure, possibly indicative of a merging system, as well as tentative evidence that 3C 294 hosts a dual AGN.
Due to its proximity to a bright star, it was subject to various adaptive optics imaging studies. In order to distinguish between the various scenarios for 3C 294 we performed deep high-resolution adaptive optics imaging and optical spectroscopy of 3C 294 with the Large Binocular Telescope. We resolve the 3C 294 system into three distinct components separated by a few tenths of an arcsecond on our images.
Read the rest (3 more)
One is compact, the other two are extended, all appear to be non-stellar. The nature of each component is unclear. The latter could be a galaxy with an internal absorption feature, a galaxy merger or two galaxies at different redshifts.
We can now uniquely associate the radio source of 3C 294 with one of the extended components. Based on our spectroscopy, we determined a redshift of z=1.784+/-0.001, which is similar to the one previously cited. In addition we found a previously unreported emission line at lambda 6749.4{AA} in our spectra.
It is not clear that it originates from 3C 294. It could be the Ne [IV] doublet lambda 2424/2426{AA} at z=1.783, or belong to the compact component at a redshift of z~4.56. We thus can not unambiguously determine whether 3C 294 hosts a dual AGN or a projected pair of AGNs.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/628/A28 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2019A&A...628A..28H ui.adsabs.harvard.edu/abs/2019A%26A...628A..28H ↗
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/628/a28 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/628/a28 | 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].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[modality].local:modality:imaging | 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 |