Spectral and Photometric Studies of NGC 7469 in the Optical Range
Shomshekova S. Reva I. Kondratyeva L. Huseynov N. Kim V. Aktay L.
July 2025Multidisciplinary Digital Publishing Institute (MDPI)
Universe
2025#11Issue 7
The galaxy NGC 7469 is a bright infrared source with an active galactic nucleus (AGN) and an intense star-forming region with a radius of approximately 500 parsecs, where the star formation rate is estimated to be 20–50 (Formula presented.). This study presents the results of spectral and photometric observations carried out during the period from 2020 to 2024 at the Fesenkov Astrophysical Institute (Almaty, Kazakhstan) and the Nasreddin Tusi Shamakhy Astrophysical Observatory (Shamakhy, Azerbaijan). Photometric data were obtained using B, V, and Rc filters, while spectroscopic observations covered the wavelength range of (Formula presented.) 4000–7000 Å. Data reduction was performed using the IRAF and MaxIm DL Pro6 software packages. An analysis of the light curves revealed that after the 2019–2020 outburst, the luminosity level of NGC 7469 remained relatively stable until the end of 2024. In November–December 2024, an increase in brightness (∼0.3–0.5 magnitudes) was recorded. Spectral data show variations in the Ha fluxes and an enhancement of them at the end of 2024. On BPT diagrams, the emission line flux ratios [OIII]/H (Formula presented.) and [NII]/H (Formula presented.) place NGC 7469 on the boundary between regions dominated by different ionization sources: AGN and star-forming regions. The electron density of the gas, estimated from the intensity ratios of the [SII] 6717, 6731 Ålines, is about (Formula presented.). Continued observations will help to determine whether the trend of increasing brightness and emission line fluxes recorded at the end of 2024 will persist.
broad emission components , emission lines , light curves , photometric observations , Seyfert galaxy , spectral observations
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Fesenkov Astrophysical Institute, Observatory 23, Medeu District, Almaty, 050020, Kazakhstan
Shamakhy Astrophysical Observatory Named After N. Tusi, Shamakhy District, Y. Mammadaliyev Settlement, AZ-5626, Azerbaijan
Fesenkov Astrophysical Institute
Shamakhy Astrophysical Observatory Named After N. Tusi
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