Table · dataset · 2025
Identifying CT-AGNs in the COSMOS. I.
Listed in IVOA Registry (Virtual Observatory)
Compton-thick active galactic nuclei (CT-AGNs), characterized by a significant absorption with column densities of N_H_>=1.5x10^24^cm^-2^, emit feeble X-ray radiation, even undetectable by X-ray instruments, making them difficult to identify.
Description
The X-ray radiations from AGNs are the predominant origin of the cosmic X-ray background (CXB). Based on the AGN synthesis models for the CXB, the fraction of CT-AGNs should constitute a substantial portion, approximately 30% or more.
The fraction of CT-AGNs discovered in the Cosmological Evolution Survey (COSMOS) is significantly lower than this value. These mean that many CT-AGNs may be hidden in AGNs that exhibit low photon counts or that have not been detected by X-ray instruments. This work focuses on identifying CT-AGNs hidden in AGNs with low photon counts.
Read the rest (3 more)
Firstly, we selected 440 AGNs with abundant multiwavelength data as our sample. Secondly, we analyzed multiwavelength data, extracting crucial physical parameters required for the CT-AGN diagnosis. Finally, we used the multiwavelength approaches to identify CT-AGNs.
We have successfully identified 18 CT-AGNs in our sample. Among the CT-AGNs, four AGNs showed discrepant results across different diagnostic methods. We discussed the potential reasons behind these diagnostic discrepancies.
We explored the impact of estimating [OIII]{lambda}5007 luminosities based on [OII]{lambda}3727 luminosities for the CT-AGN diagnosis. We also found that the properties of host galaxies for CT-AGNs and non-CT-AGNs did not show significant discrepancies.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/694/A241 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...694A.241G ui.adsabs.harvard.edu/abs/2025A%26A...694A.241G ↗
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/694/a241 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- X-Ray
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/694/a241 | 11 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:x-ray | 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 |