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- Title
Nuclear Activity of NGC 4151 as Inferred from UBVRI Observations in 1989–2000.
- Authors
Doroshenko, V. T.; Lyuty, V. M.; Bochkarev, N. G.; Vlasyuk, V. V.; Mikhaılov, V. P.; Spiridonova, O. I.; Grankin, K. N.; Ezhkova, O. V.; Mel’nikov, S. Yu.
- Abstract
We present our broadband UBVRI observations of the nucleus of the Seyfert galaxy NGC 4151 from 1989 until 2000 at three astronomical observatories: the Crimean Station of the Sternberg Astronomical Institute, the Special Astrophysical Observatory in the Caucasus, and the Maidanak Observatory of the Ulugbek Astronomical Institute in Uzbekistan. All data have been reduced to a single system and are given for an A = 27″.5 aperture. Regular R and I observations show that the pattern of optical variability is the same in all bands; the relative variability amplitude decreases from U to V, but it is even slightly larger in R than in V. The variability amplitude of the component fluctuating on time scales of several months is proportional to the UB V flux from the component varying on times scales of several years. The correlation between the slow and rapid components significantly weakens in the red, and no correlation has been found between the flux from the slow component and the amplitude of the rapid component in R. The color characteristics correspond to the recombination radiation from an optically thick plasma beyond the Balmer limit.
- Subjects
ACTIVE galactic nuclei; UBV system (Astronomy); GALAXIES
- Publication
Astronomy Letters, 2001, Vol 27, Issue 2, p65
- ISSN
1063-7737
- Publication type
Article
- DOI
10.1134/1.1344256