Table · dataset · 2025
GNIRS-DQS: SDSS 1.5<z<3.5 QSOs with NIR sp. obs.
Listed in IVOA Registry (Virtual Observatory)
Quasars at z>~1 most often have redshifts measured from rest-frame ultraviolet emission lines.
Description
One of the most common such lines, CIV{lambda}1549, shows blueshifts up to ~5000km/s and in rare cases even higher. This blueshifting results in highly uncertain redshifts when compared to redshift determinations from rest-frame optical emission lines, e.g., from the narrow [OIII]{lambda}5007 feature.
We present spectroscopic measurements for 260 sources at 1.55<~z<~3.50 having -28.0<~M_i_<~-30.0mag from the Gemini Near Infrared Spectrograph-Distant Quasar Survey (GNIRS-DQS) catalog, augmenting the previous iteration, which contained 226 of the 260 sources whose measurements are improved upon in this work. We obtain reliable systemic redshifts based on [OIII]{lambda}5007 for a subset of 121 sources, which we use to calibrate prescriptions for correcting UV-based redshifts.
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These prescriptions are based on a regression analysis involving CIV full-width-at-half-maximum intensity and equivalent width, along with the UV continuum luminosity at a rest-frame wavelength of 1350{AA}. Applying these corrections can improve the accuracy and the precision in the CIV-based redshift by up to ~850km/s and ~150km/s, respectively, which correspond to ~8.5 and ~1.5Mpc in comoving distance at z=2.5. Our prescriptions also improve the accuracy of the best available multifeature redshift determination algorithm by ~100km/s, indicating that the spectroscopic properties of the CIV emission line can provide robust redshift estimates for high-redshift quasars.
We discuss the prospects of our prescriptions for cosmological and quasar studies utilizing upcoming large spectroscopic surveys.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/950/95 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023ApJ...950...95M ui.adsabs.harvard.edu/abs/2023ApJ...950...95M ↗
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/apj/950/95 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 71%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/950/95 | 15 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 (71%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | source · 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 |