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- Title
A comparative study of the intra-night optical variability of powerful AGNs.
- Authors
Stalin, C. S.; Gopal-Krishna; Sagar, Ram; Wiita, P. J.
- Abstract
In order to address a currently much debated issue, we ate carrying out a systematic search for intra-night optical micro-variability in major classes of powerful (M[subv] ≥ -23.0 mag) active galactic nuclei (AGNs). Our sample includes 7 sets of AGNs, covering narrow redshift bins across the range 0.18 ≤ z ≤ 2.2 . Each set consists of a radio-quiet quasar, a radio lobe-dominated quasar, a BL Lac object and/or a radio core-dominated quasar (blazar), all having m[subv] ∼ 16 mag. The observations were made primarily using the 104-cm telescope of State Observatory, Nainital. The monitoring completed so far (∼ 90 nights) clearly indicates that, compared to the other AGN types, BL Lacs are distinctly more prone to exhibit intra-night optical variations.
- Subjects
GALAXIES; ACTIVE galactic nuclei; GALACTIC nuclei; QUASARS; RADIO sources (Astronomy); ASTRONOMICAL instruments
- Publication
Bulletin of the Astronomical Society of India, 2002, Vol 30, Issue 3, p765
- ISSN
0304-9523
- Publication type
Article