Table · dataset · 2024
MALS SALT-NOT survey of MIR-selected AGN at z<3.5
Listed in IVOA Registry (Virtual Observatory)
We present results of an optical spectroscopic survey using SALT and the Nordic Optical Telescope to build a Wide-field Infrared Survey Explorer mid-infrared color-based, dust-unbiased sample of powerful radio-bright (>200mJy at 1.4GHz) active galactic nuclei (AGN) for the MeerKAT Absorption Line Survey (MALS).
Description
Our sample has 250 AGN (median z=1.8) showing emission lines, 26 with no emission lines, and 27 without optical counterparts.
Overall, our sample is fainter ({Delta}i=0.6mag) and redder ({Delta}(g-i)=0.2mag) than radio-selected quasars, and representative of fainter quasar population detected in optical surveys. About 20% of the sources are narrow-line AGN (NLAGN)-65% of these, at z<0.5 are galaxies without strong nuclear emission, and 10% at z>1.9, have emission line ratios similar to radio galaxies. The farthest NLAGN in our sample is M1513-2524 (z_em_=3.132), and the largest radio source (size ~330kpc) is M0909-3133 (z_em_=0.884).
Read the rest (2 more)
We discuss in detail 110 AGN at 1.9<z<3.5. Despite representing the radio loudest quasars (median R=3685), their Eddington ratios are similar to the Sloan Digital Sky Survey quasars having lower R. We detect four CIV broad-absorption line (BAL) QSOs, all among AGN with least R, and highest black hole masses and Eddington ratios. The BAL detection rate (4_-2_^+3^%) is consistent with that seen in extremely powerful (L_1.4GHz_>10^25^W/Hz) quasars.
Using optical light curves, radio polarization, and {gamma}-ray detections, we identify seven high-probability BL Lacertae objects. We also summarize the full MALS footprint to search for HI 21cm and OH 18cm lines at z<2.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/929/108 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2022ApJ...929..108G ui.adsabs.harvard.edu/abs/2022ApJ...929..108G ↗
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/929/108 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/929/108 | 13 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:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | 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 |