Spectral and Photometric Studies of NGC 4151 in the Optical Range: Current Results
Huseynov N. Shomshekova S. Serebryanskiy A. Kondratyeva L. Rahimli S. Nazymbekov G. Reva I. Aimanova G.
January 2026Multidisciplinary Digital Publishing Institute (MDPI)
Universe
2026#12Issue 1
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.
active galaxies , archival spectral data , NGC 4151 , photometric variability , Seyfert galaxies , spectral variability , supermassive black hole
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Shamakhy Astrophysical Observatory Named After N. Tusi, Shamakhy District, Y. Mammadaliyev Settlement AZ-5626, Azerbaijan
Fesenkov Astrophysical Institute, Observatory 23, Medeu District, Almaty, 050020, Kazakhstan
Faculty of Mathematics, Physics and Informatics, Abai Kazakh National Pedagogical University, Tole bi str.86, Almaty, 050012, Kazakhstan
Shamakhy Astrophysical Observatory Named After N. Tusi
Fesenkov Astrophysical Institute
Faculty of Mathematics
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