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Showing 1 to 20 of 29 for “"SMBH"”.
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Bent tail radio sources as tracers of galaxy clusters at high redshift and SMBH mass estimates
… array (SKA). In this work we look at some SMBH mass measurements, which are crucial in the determination of the correlations between the SMBH mass and some galaxy characteristics including jet length and luminosity. The high redshift SMBH mass measurement methods are calibrated using local …
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Aktyvaus branduolio tėkmės įtaka juodosios skylės maitinimui /
… ~ 4,3 · 10e6 Solar mass supermassive black hole (SMBH) named Sagittarius A* has been discovered. In many galaxies, SMBHs are known to be part of their centers, and their gravitational pull can affect the surrounding material, potentially contributing to the formation of new stars. According to …
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Statistiškai reiškmingi skirtumai tarp aktyvių ir fosilinių tėkmių parametrų /
… are formed from gas which is farther from the SMBH than gas currently in active outflows. In lower SMBH mass models, fossil outflows are made up of lower density gas, whereas fossil outflow gas density varies more in higher SMBH mass models. In lower SMBH mass models, fossil outflows are formed …
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Dual active galactic nuclei within Romulus25
… trace the growth of supermassive black holes (SMBHs) during galaxy interactions, while also being an important electromagnetic precursor of SMBH mergers which are important for missions such as LISA. In this thesis, we aim to study the properties of DAGN within the Romulus25 simulation, which …
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Dense stellar systems and massive black holes
… Are these objects supermassive black holes (SMBHs), or do we need alternatives? The answer lies in the event horizon, the characteristic that defines a black hole. The key to probe the horizon is to model the movement of stars around a SMBH, and the interactions between them, and look for …
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Cosmological Simulations with Resolved Supermassive Black Hole Binary Dynamics and Accretion
… of galaxies and supermassive black hole (SMBH) binaries in cosmological zoom-in simulations. The focus of the study is twofold: first, the agreement between simulated galaxies and observed scaling relations is assessed, followed by an analysis of the impact of different mass accretion …
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Gravitational instability and fragmentation of self-gravitating accretion disks
… from observations that supermassive black holes (SMBH) of masses up to $10^{10} \msol$ existed in quasars when the universe was only about $10^9$ years old. The rapid formation of SMBHs can be understood as the outcome of the collision of two large gas-rich galaxies followed by disk accretion. …
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Unveiling fundamental physics with high-resolution X-ray spectroscopy of Active Galactic Nuclei.
… (ALPs) and the spin of supermassive black holes (SMBHs). Chapter 1 starts with a review of black holes as mathematical and astronomical objects and provides an account of the knowledge of the physics of the accretion flow onto SMBHs in AGNs as revealed by X-ray observations of AGNs. This is …
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The Impact of AGN Feedback on Galaxy Formation in Gas-Rich Mergers at z∼1-2
… surrounding the central supermassive black hole (SMBH). The feedback mechanisms include, for example, photoionization heating due to high-energy photons and winds and jets driven by the AGN. Numerically, AGN feedback was implemented using two models in this thesis: thermal and kinetic AGN …
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Outflows and Dust in Quasars
Supermassive black holes (SMBHs) at the centres of galaxies are known to actively accrete, forming so-called `active galactic nuclei' (AGN) or `quasars'. These AGN are believed to feed back energy into their host galaxies, regulating star formation and the growth of the SMBH itself. This thesis …
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Spectral Energy Distribution Modelling of X-ray Selected AGNs and Their Host Galaxies
… link between central supermassive black hole (SMBH) masses, and host galaxy properties such as the velocity dispersion of stars, and bulge mass. However, the difference in scale between SMBH and their host galaxies has led to debate on how this relation might form, and develop over time. In …
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Towards a complete census of active galactic nuclei in the nearby Universe
… galaxies host a central supermassive black hole (SMBH), it is natural to ask, how many of these SMBHs are actively accreting? Studies aimed at answering this question can better define the fraction of nearby galaxies that harbour active galactic nuclei (AGNs), provide constraints on the growth of …
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Spectra and variability of accreting black holes
… analysis of a sample of supermassive black hole (SMBH) sources, showing that in many of these sources, variability in the accretion disc emission is driven by heating from the central source. Chapter 3 presents results from a dedicated campaign on a particularly X-ray variable object, IRAS …
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Hunting Supermassive Black Holes in the Early Universe
Supermassive black holes (SMBHs) hold the essential ingredient into understanding the galaxy formation and evolution across cosmic time. The physical properties of SMBH are found to tightly correlated with host galaxies in local universe. Whether such relationship apply in the early universe …
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Examining the growth and evolution of magnetic fields in clusters of galaxies: a numerical perspective
… AGN or the seeding and merging of the associated SMBHs. Thus, we must include these effects as subgrid models. In order to carefully study the growth of magnetic fields in clusters via AGN-driven outflows, we present a systematic study of SMBH and AGN subgrid models. Using dark-matter only …
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Simulations of active galactic nucleus feedback in the cores of galaxy clusters
… consist of central super-massive black holes (SMBH) in galaxy clusters through simulations is a very challenging problem. Due to limited resolution to resolve physics at sub-resolution scales, previous studies usually involve a subgrid model and considerable simplification of the complex …
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Investigating the evolution of red and blue quasars
… host galaxy and central supermassive black hole (SMBH) accretion properties of a sample of 218 red and blue broadline quasars (AGN with Lₓ > 10⁴⁴ erg/s) to test the predictions of the major merger-driven evolutionary model. Using rich multiwavelength data, we analyze differences in bolometric …
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The complex interplay between AGN jet feedback and galaxy evolution
Supermassive black holes (SMBHs), residing in the nuclei of most galaxies, are capable of imparting extreme amounts of energy to their surroundings. Observations indicate the presence of collimated, relativistic jets as well as powerful, multiphase winds emanating from these active galactic nuclei …
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Reverberation mapping of Active Galactic Nuclei
… (AGNs) with central super-massive black hole (SMBH) mass estimates using reverberation mapping (RM) technique. RM makes use of the time variability of the broad emission lines from the nearby broad-line region (BLR) to measure their time response or delay (τ) relative to the incident ionizing …
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The VIMOS-VLT Deep Survey: the evolution of type-1 AGN
… nuclei contain a super-massive black hole (SMBH) and that between a third and half of them are showing some evidence of activity (Kormendy and Richstone, 1995). The discovery of a tight relation between black holes mass and velocity dispersion of their host galaxy suggests that the evolution …
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