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Activity of the Seyfert galaxy NGC 4151 in the near-IR in 1994–2011

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Abstract

We present the results of our infrared J H K L photometry of the Seyfert galaxy NGC 4151 during its active period in 1995–2011. The variable IR source was still in its active state in 2011, though its observed luminosity had almost halved compared to the maximum of 1995–1996. If the “cool” component of the galaxy’s variable source is a dust shell heated with the central “hot” source, its optical depth at 1.25 µm varied from 0.3 to almost 1.0, its temperature from 700 to 950 K, its size from 20 to 40 pc, and its mass from 2 to 40M ⊙ during our observations. A component with a period of 317 ± 5 days can be revealed in the flux variations observed in 1994–2011.

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  1. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119991, Russia

    O. G. Taranova & V. I. Shenavrin

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  1. O. G. Taranova
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  2. V. I. Shenavrin
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Correspondence to O. G. Taranova.

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Original Russian Text © O.G. Taranova, V.I. Shenavrin, 2013, published in Astronomicheskii Zhurnal, 2013, Vol. 90, No. 2, pp. 91–103.

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Taranova, O.G., Shenavrin, V.I. Activity of the Seyfert galaxy NGC 4151 in the near-IR in 1994–2011. Astron. Rep. 57, 71–83 (2013). https://doi.org/10.1134/S1063772913010071

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  • DOI: https://doi.org/10.1134/S1063772913010071

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