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 contribution

1 Scopus citations


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 (US)
Title of host publicationThe Universe of Digital Sky Surveys - A Meeting to Honour the 70th Birthday of Massimo Capaccioli
EditorsGiuseppe Longo, Maurizio Paolillo, Nicola R. Napolitano, Marcella Marconi, Enrichetta Iodice
PublisherKluwer Academic Publishers
Number of pages6
ISBN (Print)9783319193298
StatePublished - Jan 1 2016
EventConference on Universe of Digital Sky Surveys, 2014 - Naples, Italy
Duration: Nov 25 2014Nov 28 2014

Publication series

NameAstrophysics and Space Science Proceedings
ISSN (Print)1570-6591
ISSN (Electronic)1570-6605


OtherConference on Universe of Digital Sky Surveys, 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Computer Science Applications
  • Spectroscopy
  • Space and Planetary Science
  • Nuclear and High Energy Physics

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