6 papers
Estimation of black hole spins in low-mass AGNs and comparison with other types of AGNs
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
We estimated the spins of a sample of 58 low-mass AGNs. Analysis of the obtained spins showed that they decrease with increasing SMBH mass, leading us to hypothesize that mergers a…
Red Quasars: Selecting Candidates in SDSS DR16 and Estimating Their Physical Parameters
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
Using ''color cut'' method we obtained from SDSS DR16 catalog 733 red quasar candidates which amounted to approximately 4% of the objects from the initial sample. Then we estimated…
Spins of SMBHs in distant low luminosity AGNs
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
We estimated radiative efficiency, spin and SMBH mass values for sample of 33 distant low luminosity AGNs. The distribution of the estimated spin values (majority of objects have a…
MAD-Accretion Scenario in High-Mass X-Ray Binaries with Neutron Stars
N. R. Ikhsanov, M. Yu. Piotrovich, N. G. Beskrovnaya
The wind-fed accretion of gas with an intrinsic magnetic field onto neutron stars in high-mass X-ray binaries (HMXBs) is discussed. The criteria for the implementation of quasi-sph…
Estimating the spins of supermassive black holes in distant ultraluminous quasars
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
We estimated spin, inclination angle and corresponding SMBH mass values for sample of extremely distant (6 < z < 7.5) ultraluminous quasars. The estimated spin values are on averag…
Red quasars: estimation of SMBH spin, mass and accretion disk inclination angle
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
We estimated values of spin, mass and inclination angle for sample of 42 red quasars. Our estimations show that 2 objects: F2MS~J1113+1244 and F2MS~J1434+0935 with highest Eddingto…