Variability-selected AGNs in the VST-SUDARE survey of the COSMOS field

D. De Cicco, S. Falocco, M. Paolillo, G. Covone, G. Longo, A. Grado, L. Limatola, M. T. Botticella, G. Pignata, E. Cappellaro, M. Vaccari, D. Trevese, F. Vagnetti, M. Salvato, M. Radovich, W. N. Brandt, M. Capaccioli, N. R. Napolitano, P. Schipani

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


Variability is characteristic of active galaxies; luminosity variations generally occur at all wavelengths, affecting both continuum and line emission, with timescales and amplitudes depending on the wavelength. We made use of optical variability to select AGNs in the VST-SUDARE survey of the COSMOS field, and confirmed 95% of them by means of multiwavelength data from overlapping surveys. The analysis returns a sample of AGN candidates with 81% purity and 15% completeness with respect to the X-ray confirmed AGNs in the field with an optical counterpart. This study provides an estimate of the reliability of the AGN selection techniques based on variability, which will be used by future wide-field surveys, such as those by LSST.

Original languageEnglish
Title of host publicationThe Universe of Digital Sky Surveys - A Meeting to Honour the 70th Birthday of Massimo Capaccioli
PublisherKluwer Academic Publishers
Number of pages6
ISBN (Print)9783319193298
Publication statusPublished - 2016
EventConference on Universe of Digital Sky Surveys, 2014 - Naples, Italy
Duration: 25 Nov 201428 Nov 2014


OtherConference on Universe of Digital Sky Surveys, 2014

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Computer Science Applications
  • Spectroscopy
  • Space and Planetary Science
  • Nuclear and High Energy Physics


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