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
UDK 53 Физика
UDK 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
UDK 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
UDK 523 Солнечная система
UDK 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
UDK 52-1 Метод изучения
UDK 52-6 Излучение и связанные с ним процессы
GRNTI 41.00 АСТРОНОМИЯ
GRNTI 29.35 Радиофизика. Физические основы электроники
GRNTI 29.31 Оптика
GRNTI 29.33 Лазерная физика
GRNTI 29.27 Физика плазмы
GRNTI 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
OKSO 03.06.01 Физика и астрономия
OKSO 03.05.01 Астрономия
OKSO 03.04.03 Радиофизика
BBK 2 ЕСТЕСТВЕННЫЕ НАУКИ
BBK 223 Физика
TBK 614 Астрономия
TBK 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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