ABSTRACT This paper explores the application of machine learning methods for classifying astronomical sources using photometric data, including normal and emission line galaxies (ELGs; starforming, starburst, AGN, broad-line), quasars, stars. We utilized samples from Sloan Digital Sky Survey (SDSS) Data Release 17 (DR17) ALLWISE catalogue, which contain spectroscopically labelled SDSS. Our methodology comprises two parts. First, we conducted experiments, three-class, four-class, seven-class...

Aims. We explore machine learning techniques to forecast the star-formation rate, stellar mass, and metallicity across galaxies with redshifts ranging from 0.01 0.3. Methods. Leveraging CatBoost deep architectures, we utilised multiband optical infrared photometric data SDSS AllWISE trained on MPA-JHU DR8 catalogue. Results. Our study demonstrates potential of accurately predict galaxy properties solely data. achieved minimised root mean square errors specifically by employing model. For...

We perform two-dimensional hydrodynamical simulations of slowly rotating accretion flows in the region $ 0.01-7\, \mathrm{pc} around a supermassive black holes with M_\mathrm{BH} = 10^{8} M_{\odot} $. The flow is irradiated by photons from central active galactic nucleus (AGN). In addition to direct radiation AGN, we have also included "re-radiation", i.e., locally produced Thomson scattering, line and bremsstrahlung radiation. Compare our previous work, improved calculation force due...

Abstract We solved the set of two-dimensional magnetohydrodynamic (MHD) equations for optically thin black hole accretion flows incorporating toroidal component magnetic field. Following global and local MHD simulations disks, field inside disk is decomposed into a large-scale fluctuating The effects in transferring angular momentum dissipating energy are described through usual α description. by assuming steady-state radially self-similar approximation r − θ plane spherical coordinate...

Abstract We present the two-dimensional inflow–outflow solutions of radiation hydrodynamic equations supercritical accretion flows. Compared with prior studies, we include all components viscous stress tensor. assume steady-state flow and use self-similar in radial direction to solve r – θ domain spherical coordinates. The set differential have been integrated from rotation axis equatorial plane. find that self-similarity assumption requires profile density is described by ρ ( ) ∝ −0.5 ....

We solve the set of hydrodynamic equations for optically thin advection-dominated accretion flows by assuming a radially self-similar spherical coordinate system . The disk is considered to be in steady state and axisymmetric. define boundary conditions at pole equator and, avoid singularity rotation axis, taken symmetric with respect this axis. Moreover, only component viscous stress tensor assumed, we have main purpose study investigate variation dynamical quantities flow vertical...

We solve the two-dimensional hydrodynamic equations of hot accretion flow in presence thermal conduction. The is assumed to be steady-state and axisymmetric, self-similar approximation adopted radial direction. In this study, we consider viscous stress tensor mimic effects magnetorotational instability for driving angular momentum. impose physical boundary conditions at both rotation axis equatorial plane obtain solutions full $ r-\theta space. have found that conduction indispensable term...

We solve the radiation-hydrodynamic equations of supercritical accretion flows in presence radiation force and outflow by using self-similar solutions. Similar to pioneering works, this paper we consider a power-law function for mass inflow rate as . found that s = 1 when radiative cooling term is included energy equation. Correspondingly, effective temperature profile with respect radius was obtained In addition, investigated influence on dynamics flow. also calculated continuum spectrum...

Aims. We explore machine learning techniques to forecast star formation rate, stellar mass, and metallicity across galaxies with redshifts ranging from 0.01 0.3. Methods. Leveraging CatBoost deep architectures, we utilize multiband optical infrared photometric data SDSS AllWISE, trained on the MPA-JHU DR8 catalogue. Results. Our study demonstrates potential of in accurately predicting galaxy properties solely data. achieve minimised root mean square errors, specifically employing model. For...

Abstract We investigate the dependency of inflow-wind structure a hot accretion flow on kinematic viscosity coefficient. In this regard, we propose model for coefficient to mimic behavior magnetorotational instability that would be maximal at rotation axis. Then, compare our with two other prescriptions from numerical simulations flow. solve two-dimensional hydrodynamic equations flows in presence thermal conduction. The self-similar approach is also adopted radial direction. calculate...

Abstract We explore the effects of anisotropic thermal conduction, pressure, and magnetic field strength on hot accretion flows around black holes by solving axisymmetric, steady-state magnetohydrodynamic equations. The pressure is known as a mechanism for transporting angular momentum in weakly collisional plasmas with extremely low mass rates. However, does not extensively impact transport momentum, it leads to shrinkage wind region. Our results show that can help Poynting energy flux...

Abstract Previous numerical simulations have shown that strong winds can be produced in the hot accretion flows around black holes. Most of those studies focus only on region close to central hole; therefore it is unclear whether wind production stops at large radii Bondi radius. Bu et al. (2016) studied flow radius presence nuclear star gravity. They find that, when stars gravity important–comparable hole gravity, cannot However, for some galaxies, may not strong. In this case, clear. We...

This paper explores the application of machine learning methods for classifying astronomical sources using photometric data, including normal and emission line galaxies (ELGs; starforming, starburst, AGN, broad line), quasars, stars. We utilized samples from Sloan Digital Sky Survey (SDSS) Data Release 17 (DR17) ALLWISE catalog, which contain spectroscopically labeled SDSS. Our methodology comprises two parts. First, we conducted experiments, three-class, four-class, seven-class...

Previous numerical simulations have shown that strong winds can be produced in the hot accretion flows around black holes. Most of those studies focus only on region close to central hole, therefore it is unclear whether wind production stops at large radii Bondi radius. Bu et al. 2016 studied flow radius presence nuclear star gravity. They find when stars gravity important/comparable hole gravity, not However, for some galaxies, may strong. In this case, clear. We study with and without...