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Keywords = NGC 4151

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12 pages, 1137 KB  
Article
Spectral and Photometric Studies of NGC 4151 in the Optical Range: Current Results
by Nazim Huseynov, Saule Shomshekova, Alexander Serebryanskiy, Luydmila Kondratyeva, Samira Rahimli, Gabit Nazymbekov, Inna Reva and Gaukhar Aimanova
Universe 2026, 12(1), 19; https://doi.org/10.3390/universe12010019 - 9 Jan 2026
Viewed by 504
Abstract
We present the results of long-term photometric and spectroscopic monitoring of the Seyfert galaxy NGC 4151 based on new observational data complemented by archival material spanning several decades. NGC 4151 is one of the most extensively studied active galactic nuclei, exhibiting pronounced variability [...] Read more.
We present the results of long-term photometric and spectroscopic monitoring of the Seyfert galaxy NGC 4151 based on new observational data complemented by archival material spanning several decades. NGC 4151 is one of the most extensively studied active galactic nuclei, exhibiting pronounced variability in both optical continuum and emission-line fluxes, which makes it a key object for investigating physical processes in the central engine and the broad-line region. Our study covers the optical and near-infrared wavelength ranges, including the Ic band and the standard BVRc photometric filters. Using multi-band optical photometry and optical spectroscopy, we construct light curves of the continuum and emission lines and perform a comparative analysis of their temporal behavior during different activity states of the galaxy. The analysis focuses on variability amplitudes, long-term trends, and correlations between photometric and spectral characteristics, allowing us to examine the relationship between continuum variations and the line-emitting regions. Full article
(This article belongs to the Section Galaxies and Clusters)
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18 pages, 1390 KB  
Article
Probing the Dusty Torus of Seyfert Galaxy NGC 4151: A Multi-Band Study
by Arya Sudhakaran, Debbijoy Bhattacharya, Puthiyaveettil Shalima, Gulab Chand Dewangan and Parameshwaran Sreekumar
Galaxies 2026, 14(1), 3; https://doi.org/10.3390/galaxies14010003 - 6 Jan 2026
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Abstract
Despite several efforts to investigate the accretion disk and torus, near-simultaneous broadband studies of the nuclear regions of radio-quiet AGNs remain lacking. NGC 4151, one of the closest and brightest Seyfert galaxies, provides an excellent laboratory for probing the circum-nuclear regions of AGNs. [...] Read more.
Despite several efforts to investigate the accretion disk and torus, near-simultaneous broadband studies of the nuclear regions of radio-quiet AGNs remain lacking. NGC 4151, one of the closest and brightest Seyfert galaxies, provides an excellent laboratory for probing the circum-nuclear regions of AGNs. A detailed, near-simultaneous broadband spectral study of NGC 4151 is carried out during one of its historic minimum activity states, using archival data from the Ultraviolet (UV) to the Infrared (IR) regions. We used the radiative transfer code SKIRT to model the source and to constrain the properties of the torus. We found that the observed broadband spectral energy distribution is best explained by a two-torus geometry with a polar conical shell structure. Full article
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