Table · dataset · 2025
Re-classification of high-redshift QSOs
Listed in IVOA Registry (Virtual Observatory)
The discovery of outsiders in the form of unusual, rare, or even unknown object types is important as they can provide useful information about otherwise hidden physical phenomena and processes.
Description
The present study takes advantage of the fact that the automated spectroscopic pipeline of the Sloan Digital Sky Survey (SDSS) occasionally assigns uncommon spectra to high-redshift quasi-stellar objects (QSOs). This study presents an analysis of about 4000 spectra that are QSOs with redshifts z>4.5 according to the spectroscopic pipeline of the Sloan Digital Sky Survey (SDSS) DR16.
It turns out that, after excluding non-classifiable spectra of low quality and those from three special plates, only 26% are high-z QSOs, 50% are QSOs at lower redshifts, 16% are galaxies, and 8% are stars. A significant proportion of the latter three categories prove to be unusual and are re-assigned here to a variety of rare spectral types. The results of the re-evaluation are summarised in the catalogue.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/704/A343 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...704A.343M ui.adsabs.harvard.edu/abs/2025A%26A...704A.343M ↗
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/704/a343 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 74%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/704/a343 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (74%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| 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 |