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. We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South (W-CDF-S), 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. 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. 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 $lesssim 20%$ and a completeness $sim 38%$ with respect to mid-infrared selected samples.

Poulain, M., Paolillo, M., De Cicco, D., Brandt, W.n., Bauer, F.e., Falocco, S., et al. (2020). Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region. ASTRONOMY & ASTROPHYSICS, 634, 50 [10.1051/0004-6361/201937108].

Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region

F. Vagnetti;
2020-01-08

Abstract

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. We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South (W-CDF-S), 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. 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. 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 $lesssim 20%$ and a completeness $sim 38%$ with respect to mid-infrared selected samples.
8-gen-2020
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
http://arxiv.org/abs/2001.02560v1
Poulain, M., Paolillo, M., De Cicco, D., Brandt, W.n., Bauer, F.e., Falocco, S., et al. (2020). Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region. ASTRONOMY & ASTROPHYSICS, 634, 50 [10.1051/0004-6361/201937108].
Poulain, M; Paolillo, M; De Cicco, D; Brandt, Wn; Bauer, Fe; Falocco, S; Vagnetti, F; Grado, A; Ragosta, F; Botticella, Mt; Cappellaro, E; Pignata, G;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/226532
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