Article
Astronomy & Astrophysics
Yihuan Di, Yuan Li, Feng Yuan, Fangzheng Shi, Mirielle Caradonna
Summary: We conducted high-resolution hydrodynamical simulations using MACER framework to investigate SMBH feeding and feedback in a massive compact galaxy. Compared to a reference galaxy, the compact galaxy shows a higher inflow rate, resulting in stronger SMBH feeding and feedback, and a larger inflow-outflow structure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Mark D. Smith, Martin Bureau, Timothy A. Davis, Michele Cappellari, Lijie Liu, Kyoko Onishi, Satoru Iguchi, Eve North, Marc Sarzi
Summary: The study investigates the correlation between SMBH masses and CO line widths using resolved and unresolved methods, finding the tightest correlation with the resolved sample and a total scatter of 0.6 dex, mainly influenced by the intrinsic scatter of 0.5 dex. Additionally, a strong correlation is found between deprojected CO line widths and stellar velocity dispersions averaged within one effective radius.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Onur Catmabacak, Robert Feldmann, Daniel Angles-Alcazar, Claude-Andre Faucher-Giguere, Philip F. Hopkins, Dusan Keres
Summary: The concurrent growth of supermassive black holes and their host galaxies is explored using cosmological zoom-in simulations. The results show that the growth of supermassive black holes at low redshift can be explained by a gravitational torque-driven accretion model. At high redshift, supermassive black holes are found to be undermassive but start to grow efficiently once their host galaxies reach a certain mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Linhao Ma, Philip F. Hopkins, Xiangcheng Ma, Daniel Angles-Alcazar, Claude-Andre Faucher-Giguere, Luke Zoltan Kelley
Summary: Supermassive black holes in the early universe may not efficiently sink in high-z galaxies, but solutions such as increasing the number of seeds or embedding seed BHs in dense structures can be considered.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Imran Tariq Nasim, Cristobal Petrovich, Adam Nasim, Fani Dosopoulou, Fabio Antonini
Summary: This paper uses high-resolution N-body simulations to study the merger of two equal-mass galaxies hosting a central SMBH and the formation of SMBH binaries. The research findings suggest that binaries with high eccentricity quickly reverse their sense of rotation due to torque from the triaxial background mass distribution. This has significant implications for the detection of gravitational wave signals emitted by these systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Sobolenko, P. Berczik, R. Spurzem
Summary: The hierarchical merging scenario is one mechanism leading to the creation of supermassive black holes, with the ultraluminous infrared galaxy NGC 6240 being one of the strongest SMBHB candidates. Dynamical calculations in dense stellar environments show that initial physical conditions can strongly affect merging time estimations, but within certain parameters, no strong correlation is found between merging time and mass ratios. This research sets an upper limit of around 55 Myr for the merging time of central SMBHBs.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Shihong Liao, Peter H. Johansson, Matias Mannerkoski, Dimitrios Irodotou, Francesco Paolo Rizzuto, Stuart McAlpine, Antti Rantala, Alexander Rawlings, Till Sawala
Summary: We propose a new model to study the accretion and feedback of SMBH binaries, which allows us to investigate the evolution of SMBH binaries in gas-rich galaxy mergers. Our model includes preferential mass accretion on to the secondary SMBH and can resolve SMBH binaries down to separations of tens of Schwarzschild radii. We perform simulations of gas-rich disc galaxy mergers with different types of AGN feedback and find that the feedback implementation plays a critical role in the merger time-scales and the resulting stellar profiles.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Federico Lelli, Timothy A. Davis, Martin Bureau, Michele Cappellari, Lijie Liu, Ilaria Ruffa, Mark D. Smith, Thomas G. Williams
Summary: The mm-Wave Interferometric Survey of Dark Object Masses (WISDOM) is used to study the properties of supermassive black holes (SMBHs) in galaxies. In this study, Fairall 49, a luminous infrared galaxy with an active galactic nuclei (AGNs), is investigated using ALMA observations and HST imaging. The results reveal the kinematics of CO gas, the mass of SMBH, the molecular gas mass, and the gas inflow rate in the galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jorge Sanchez Almeida, Mireia Montes, Ignacio Trujillo
Summary: A recent paper reported the discovery of a thin linear object believed to be the trail of star-forming regions left behind by a runaway supermassive black hole. The actual physical interpretation is challenging, as the wake of a black hole typically produces only small perturbations. An alternative explanation suggests that the object is a bulgeless galaxy viewed edge-on.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Will Lockhart, Samuel E. Gralla
Summary: EHT observations of the core of M87 suggest a ring-like structure with a diameter of approximately 40 microarcseconds. The thickness of the ring is uncertain, but alternative data analysis methods indicate a preference for thicker rings compared to theoretical expectations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Yannick M. Bahe, Joop Schaye, Matthieu Schaller, Richard G. Bower, Josh Borrow, Evgenii Chaikin, Roi Kugel, Folkert Nobels, Sylvia Ploeckinger
Summary: The repositioning of supermassive black holes is a necessary prerequisite for active galactic nucleus feedback in galaxy formation simulations. It promotes black hole growth and accelerates mergers, leading to increased accretion rates. Limiting the repositioning speed delays feedback and limits its impact on stellar mass growth. A more sophisticated treatment of repositioning is critical for more predictive simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Stefania Barsanti, Matthew Colless, Francesco D'Eugenio, Sree Oh, Julia J. Bryant, Sarah Casura, Scott M. Croom, Yifan Mai, Andrei Ristea, Jesse van de Sande, Charlotte Welker, Henry R. M. Zovaro
Summary: The activity of central supermassive black holes affects the alignment between galaxy spin axes and cosmic filaments. By analyzing observational data, the study finds that gas and stellar spin-filament alignments are influenced by active galactic nuclei (AGN) and bulge mass, with stellar alignments being more strongly correlated with the black hole mass proxy. Bulge mass is the primary parameter for spin-filament alignments, while black hole activity plays a crucial role in star formation quenching.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Zhiyuan Zheng, Yong Shi, Fuyan Bian, Xiaoling Yu, Junfeng Wang, Jianhang Chen, Xin Li, Qiusheng Gu
Summary: AGN feedback is important in massive galaxies, and it also plays a significant role in dwarf galaxies. We observed a spatially extended and fast AGN-driven outflow in the dwarf galaxy Sloan Digital Sky Survey J022849.51-090153.8. The outflow has a size of about 3 kpc and a velocity of about 471 km/s.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Mengye Wang, Yiqiu Ma, Qingwen Wu
Summary: In this study, the effects of gas accretion on the mass distribution and migration of stellar-mass black holes and stars in the accretion disc of active galactic nuclei are simulated and explored. It is found that stellar-mass black holes can grow up to several tens solar mass and form heavier black hole binaries. This can help us understand the black-hole mass distribution observed by ground-based gravitational wave detectors such as LIGO/Virgo, ET, and Cosmic Explorer.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Mechanics
H. Alrebdi, Fredy L. Dubeibe, Euaggelos E. Zotos
Summary: The orbital properties of stars in a disk galaxy with a central rotating black hole are numerically investigated. It is found that the angular momentum of the black hole has a profound influence on the orbital properties of the galaxy, as suggested by the orbit taxonomy.
Article
Astronomy & Astrophysics
Bakhtiyor Narzilloev, Bobomurat Ahmedov
Summary: This work continues the previous research on Bardeen black hole and perfect fluid dark matter, expanding the study on X-ray sources containing black hole candidates and exploring the importance of additional spacetime parameters in interpreting observational radiative efficiency.
Article
Physics, Multidisciplinary
Temurbek Mirzaev, Song Li, Bakhtiyor Narzilloev, Ibrar Hussain, Ahmadjon Abdujabbarov, Bobomurat Ahmedov
Summary: We study the effect of strong gravitational field on the light rays emitted from particles in the accretion disk near the Kerr-Newman-NUT-Kiselev (KNNK) black hole in Rastall gravity (RG). The thermal flux of the accretion disk strongly depends on the intensity of the quintessence in the spacetime of the KNNK black hole in RG, and decreases with increasing quintessential intensity. The shadow cast by the KNNK black hole in RG is influenced by the inclination angle of the incident light and the parameters alpha and omega(q) of the quintessence.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Review
Multidisciplinary Sciences
Bakhtiyor Narzilloev, Bobomurat Ahmedov
Summary: This work reviews the investigation of electromagnetic, optical, and energetic properties of astrophysical and galactic black holes and surrounding matter. Astrophysical applications of theoretical models to describe observed phenomena are discussed. It has been shown that observational data strongly depends on the structure and evolution of the accretion disk surrounding the black hole. The simulated images of supermassive black holes obtained are in agreement with the observations, and the high energetic activity from supermassive black holes is consistent with observed cosmic rays.
Article
Multidisciplinary Sciences
Farruh Atamurotov, Husan Alibekov, Ahmadjon Abdujabbarov, Ghulam Mustafa, Mersaid M. Aripov
Summary: This paper investigates gravitational weak lensing around a Bardeen black hole with the string clouds parameter, examining the horizon structure in the presence of string clouds around the gravitational compact object defined by Bardeen spacetime. The effect of gravitational weak lensing in a plasma medium is also discussed. The findings reveal that the influence of the string cloud parameter on the circular orbits of a light ray around the black hole is greater than that in the Schwarzschild case, while the influence of the charge is reversed. The deflection angle of light rays in weak lensing is also used to study magnification of the image.
Article
Astronomy & Astrophysics
Sanjar Shaymatov, Bobomurat Ahmedov, Eldor Karimbaev
Summary: This paper investigates the overspinning behavior of a seven-dimensional rotating black hole with three rotation parameters and shows that a black hole in seven dimensions cannot be overspun, even under linear particle accretion, thereby confirming the weak cosmic censorship conjecture (WCCC) in seven dimensions.
Article
Astronomy & Astrophysics
Shukhrat N. N. Mardonov, Bobir A. A. Toshmatov, Bobomurat J. J. Ahmedov, Shukurillo T. T. Inoyatov
Summary: The concept of polaron quasiparticles was first introduced in the pioneering papers by Landau and Feynman in the 1930s and 1940s. It describes the phenomenon of an external particle producing a bound state in an embedded medium. Since then, the study of polaron quasiparticles has been an active area of research in condensed matter physics, with a wide range of applications in magnetic phenomena and lattice deformation properties. This paper provides a comprehensive review of the polaron quasiparticle phenomenon, including its historical origins, theoretical developments, and current research. The review also discusses the various applications of polaron quasiparticles in condensed matter physics, including in magnetic phenomena and lattice deformation properties. It concludes with an outlook on future directions of research in this field.
Article
Physics, Nuclear
Furkat Sarikulov, Farruh Atamurotov, Ahmadjon Abdujabbarov, Vokhid Khamidov
Summary: In this study, we investigate the motion of photons in curved spacetime and explore the effects of gravitational weak lensing in black-bounce gravity. We analyze the horizon structure around a compact object described by black-bounce spacetime and study the shadow radius of the object as well as the magnification of the image using the deflection angle of light rays.
Article
Physics, Multidisciplinary
Abdurakhmon Nosirov, Farruh Atamurotov, Gulzoda Rakhimova, Ahmadjon Abdujabbarov
Summary: We have studied the structure of the horizon and ergosphere in the background of the rotating Simpson-Visser (SV) black hole by considering time-like geodesics. We have examined the innermost stable circular orbits (ISCO) and the effective potential that controls particle motion in spacetime for different parameter values in the SV black hole. Additionally, the center-of-mass energy of two colliding particles near the horizon and the thermodynamic properties of the SV black hole have been investigated.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Multidisciplinary Sciences
Husan Alibekov, Bakhtiyor Narzilloev, Ahmadjon Abdujabbarov, Bobomurat Ahmedov
Summary: The motion of photons and the frequency shift of photons emitted by particles orbiting the central black hole described by the deformed Reissner-Nordstrom spacetime metric is studied. It is found that two stable photon spheres are formed in spacetime due to the gravitational attraction of photons by the central gravitating object. The size of charge and deformation photon spheres decreases as the spacetime parameters increase, and the effect of the electric charge is stronger than the effect of the deformation parameter. The frequency shift of photons emitted by particles at the equatorial plane is stronger for smaller values of the deformation parameter and the electric charge of the deformed Reissner-Nordstrom black hole.
Article
Multidisciplinary Sciences
Bobur Turimov, Bobomurat Ahmedov
Summary: We study the matter accretion properties in the gamma metric, including thin accretion disks and radial accretion of polytropic matter fields. The results suggest that the true nature of astrophysical black hole candidates may be different from what we previously believed.
Article
Astronomy & Astrophysics
Sardor Murodov, Javlon Rayimbaev, Bobomurat Ahmedov, Eldor Karimbaev
Summary: This study investigates the effects of spacetime deformation around black holes on particle dynamics and accretion discs, and constrains the deviation parameter of the spacetime around the central black hole in microquasars through observations.
Article
Astronomy & Astrophysics
Akbar Davlataliev, Bakhtiyor Narzilloev, Ibrar Hussain, Ahmadjon Abdujabbarov, Bobomurat Ahmedov
Summary: This study investigates the optical properties of a rotating black hole in the context of Starobinsky-Bel-Robinson gravity. The results show that the ss parameter has a significant impact on photon motion near the black hole, but its influence weakens as the distance from the black hole increases. The deflection angle of photons for gravitational lensing decreases monotonically with increasing plasma parameter k. The presence of the ss parameter leads to a maximum deflection angle near the black hole, which decreases as the photon distance from the black hole horizon increases. The photon sphere radius is strongly affected by both the ss parameter and the black hole spin, while the plasma parameter has a weak influence. The shadow cast by the black hole is deformed on the left-hand side due to the ss parameter, and an increase in the plasma parameter k reduces the shadow size. The effect of the black hole spin on the shadow size is observed for larger values of ss. The average shadow radius is influenced by the spacetime parameters and plasma parameter, exhibiting a non-monotonic behavior with increasing ss. The distortion of the black hole shadow is significantly and non-monotonically influenced by the ss parameter. Observational constraints for Sgr A* show that our model falls within the confidence bounds but falls short of the upper limits, indicating limitations on the shadow radius.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Particles & Fields
Javlon Rayimbaev, Konstantinos F. Dialektopoulos, Furkat Sarikulov, Ahmadjon Abdujabbarov
Summary: Testing gravity theories and their parameters through observations is crucial in relativistic astrophysics. This study investigates the motion and harmonic oscillations of test particles in the spacetime of nonrotating hairy black holes, and explores astrophysical applications of quasiperiodic oscillations. The research examines the potential values of twin-peak quasiperiodic oscillations in different orbits and models, and analyzes the behavior and position of these oscillations relative to innermost stable circular orbits. The study also provides mass constraints for two microquasars and determines the possible value of a specific parameter in the context of the quasiperiodic oscillation models discussed.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Temurbek Mirzaev, Askar B. Abdikamalov, Ahmadjon A. Abdujabbarov, Dimitry Ayzenberg, Bobomurat Ahmedov, Cosimo Bambi
Summary: This study investigates the optical properties of rotating black holes in the Kaluza-Klein theory, focusing on the total mass, spin, and electric and magnetic charges. By using a developed general relativistic ray-tracing code, the motion of photons is calculated, generating shadows of Kaluza-Klein black holes. The properties of these shadows and the deflection of light around the black holes are studied to place constraints on the parameters of Kaluza-Klein black holes using M87* shadow observations. The study finds that small charges of the black hole can meet these constraints. The conclusion is drawn that the current precision of M87* black hole shadow observations is insufficient to distinguish between Kaluza-Klein black holes and Kerr black holes. Higher observational accuracy is required to verify constraints on modified theories of gravity in the strong field regime.
EUROPEAN PHYSICAL JOURNAL C
(2023)