Department of Physics, M.V. Lomonosov Moscow State University
Center for Astro, Particle, and Planetary Physics, NYU AD
Universite Paris Cite, CNRS(IN2P3), Astroparticule et Cosmologie
Department of Physics, M.V. Lomonosov Moscow State University
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Intermediate-mass black holes (IMBHs) with masses below ($2 \times 10^5 M_{\odot}$) are key to understanding the origin and growth mechanisms of supermassive black holes (SMBHs) in galactic nuclei. This study focuses on the search for and detailed analysis of central lightweight black holes in various galaxies. An extended sample of IMBH candidates was selected from the RCSED optical spectral catalog, followed by refined spectral observations using large telescopes, including the Magellan, SALT, Keck, and CMO telescopes. Analysis of more than 70 spectra has obtained accurate virial masses, stellar population parameters, and kinematics. One significant result includes the detection of a binary black hole system with masses of ($1.7 \times 10^5 M_{\odot})$ and $(1.4 \times 10^6 M_{\odot}$). Our results indicate that IMBHs and their low-mass SMBH counterparts do not necessarily co-evolve with their host galaxies, suggesting that super-Eddington accretion is the dominant growth mechanism. This research improves the precision of virial mass estimates and provides new insights into the $M_{\rm BH} - \sigma_{\rm bulge}$ bulge relation, with potential implications for future high-redshift SMBH observations using next-generation facilities.
cosmology: observations; early universe; galaxies: active, nuclei, Seyfert; quasars: supermassive black holes
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