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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The results of an almost 12-year-long JHKL photometry of a 12" region in the Seyfert 1s galaxy NGC 4151 are presented. An analysis of the observations shows that the infrared brightness of the galaxy considerably increased from 1985 through 1996 (by ~ 0.9m at lambda 1.25 microns, by ~1m at 1.65 microns, by ~1.1m at 2.2 microns, and by ~ 1.33m at 3.5 microns). The brightening was accompanied by its reddening. We could not determine how the JHKL brightness rose - abruptly or smoothly - from our observations, because there were no observations from 1989 to 1993. In the two-color H-K, J-H and K-L, H-K diagrams, our photometric JHKL data cluster around the infrared color curve of a source with a power-law spectral energy distribution. A search for periodic JHKL light variations in NGC 4151 points to the possible of several periods in the observed infrared light and color variations of the galaxy. The period of 43.0 days seems most plausible.