Project information
Stars in galactic nuclei: interrelation with massive black holes
- Project Identification
- GM24-10599M
- Project Period
- 1/2024 - 12/2028
- Investor / Pogramme / Project type
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Czech Science Foundation
- JUNIOR STAR
- MU Faculty or unit
- Faculty of Science
Cílem projektu je studium vzájemné interakce mezi hvězdami a supermasivními černými dírami (SCD) v galaktických jádrech. Již dříve jsme ukázali, že interakce s nukleárním jetem může podstatně ovlivnit vlastnosti hvězd. Zde navrhujeme rozšířit předchozí studie systematickou analýzou kombinované interakce hvězd s akrečním diskem i jetem. Opakovaná setkání zvýší ztrátu hvězdné hmoty, a tudíž kromě modifikace hvězdného vývoje nevyhnutelně změní i stav akrece SCD. Tradiční unifikované modely aktivních galaktických jader (AGJ) vliv hvězd zanedbávají. Ty však mohou nejen ovlivňovat akreční stav SCD, ale nakonec jej také určovat prostřednictvím hustých koncentrací - jaderných hvězdokup (JH). K pochopení souvislosti mezi modulací akrečního stavu SCD ze strany JH a zpětnou vazbou AGJ na velkých škálách je zapotřebí porovnat vlastnosti JH, charakteristiky rádiové emise na menších a větších škálách, jakož i vlastnosti rentgenové emise v rámci Bondiho poloměru SCD.
The goal of the project is to study the mutual interaction between stars and supermassive black holes (SBHs) in galactic nuclei. Previously, we showed that the interaction with the nuclear jet can substantially affect stellar characteristics. Here we propose to extend previous studies by analyzing systematically the combined interaction of stars with both the accretion disk and the jet. Repetitive encounters will enhance stellar mass loss and hence, in addition to modifying stellar evolution, they inevitably change the accretion state of the SBH. Traditional unified models of active galactic nuclei (AGN) neglect the effect of stars. However, they can not only perturb the accretion state of SBHs, but eventually also determine it via dense concentrations – nuclear star clusters (NSCs). Comparison of the NSC properties, radio emission characteristics on smaller and larger scales as well as X-ray emission properties within the Bondi radius of the SBH are needed to comprehend the link between the NSC modulation of the SMBH accretion state and large-scale AGN feedback.
Sustainable Development Goals
Masaryk University is committed to the UN Sustainable Development Goals, which aim to improve the conditions and quality of life on our planet by 2030.
Publications
Total number of publications: 43
2026
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A Brush with Turbulence: Probing the ICM Dynamics in the Merging Toothbrush Cluster using XRISM
Astronomy and Astrophysics, year: 2026
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Binary Dynamics and Mergers in a Stellar Disk and the Formation of Dusty Objects in the Galactic Center
ASTROPHYSICAL JOURNAL, year: 2026, volume: 1011, edition: 1, DOI
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Constraining the Galactic center dark cluster with ELT/MICADO observations
ASTRONOMY & ASTROPHYSICS, year: 2026, volume: 710, edition: June, DOI
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Eclipses of Nearby Millimeter-bright Galactic Nuclei by Stars in Nuclear Star Clusters
ASTROPHYSICAL JOURNAL, year: 2026, volume: 1009, edition: 1, DOI
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Evolution of quasi-periodic eruptions in the post-tidal disruption event accretion disk perturbed by an orbiting star
ASTRONOMY & ASTROPHYSICS, year: 2026, volume: 709, edition: May, DOI
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Galaxy-SMBH co-evolution in 2435 DESI disc galaxies and merger-free BH growth in bulgeless discs
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, year: 2026, volume: 552, edition: 4, DOI
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HALO I. Photometric continuum reverberation mapping of Fairall 9
ASTRONOMY & ASTROPHYSICS, year: 2026, volume: 706, edition: February, DOI
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Chemical enrichment of the Perseus cluster core seen by XRISM/Resolve
ASTRONOMY & ASTROPHYSICS, year: 2026, volume: 712, edition: August, DOI
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IceCube AGN neutrino source candidate PKS 2233−148: peculiar observed properties & possible gravitational lensing signatures
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, year: 2026, volume: 552, edition: 2, DOI
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Iron He-triplet signatures of shocks in the hottest galaxy clusters Z/W line ratio, line broadening, and electron-ion temperature equilibration
ASTRONOMY & ASTROPHYSICS, year: 2026, volume: 711, edition: July, DOI