Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region
Journal
Date Issued
2020
Author(s)
Poulain, M.
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•
De Cicco, D.
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Brandt, W. N.
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Bauer, F. E.
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Falocco, S.
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Vagnetti, F.
•
•
Ragosta, F.
•
•
•
Pignata, G.
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•
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COVONE, GIOVANNI
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Longo, G.
•
Abstract
Context. Variability has proven to be a powerful tool to detect active galactic nuclei (AGN) in multi-epoch surveys. The new-generation facilities expected to become operational in the next few years will mark a new era in time-domain astronomy and their wide-field multi-epoch campaigns will favor extensive variability studies.
Aims: We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South, performed in the r band and covering a 2 sq. deg area. The analysis complements a previous work, in which the first half of the area was investigated. We provide a reliable catalog of variable AGN candidates, which will be critical targets in future variability studies.
Methods: We selected a sample of optically variable sources and made use of infrared data from the Spitzer mission to validate their nature by means of color-based diagnostics.
Results: We obtain a sample of 782 AGN candidates among which 12 are classified as supernovae, 54 as stars, and 232 as AGN. We estimate a contamination ≲20% and a completeness ˜38% with respect to mid-infrared selected samples.
Aims: We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South, performed in the r band and covering a 2 sq. deg area. The analysis complements a previous work, in which the first half of the area was investigated. We provide a reliable catalog of variable AGN candidates, which will be critical targets in future variability studies.
Methods: We selected a sample of optically variable sources and made use of infrared data from the Spitzer mission to validate their nature by means of color-based diagnostics.
Results: We obtain a sample of 782 AGN candidates among which 12 are classified as supernovae, 54 as stars, and 232 as AGN. We estimate a contamination ≲20% and a completeness ˜38% with respect to mid-infrared selected samples.
Full Table 3 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/634/A50
Volume
634
Start page
A50
Issn Identifier
0004-6361
Ads BibCode
2020A&A...634A..50P
Rights
open.access
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