Search academic texts

Information × Registration Number 0217U001460, 0116U007009 , R & D reports Title Application of the GRID-technology to the astrophysical computing intensive tasks and upgrade/development of the GRID cluster of MAO NANU popup.stage_title Head Berczik P.P., Registration Date 15-02-2017 Organization Main Astronomical Observatory popup.description2 Here, we present the first multi-scale lambda-CDM cosmological simulation that follows the orbital decay of a pair of SMBHs in a merger of two typical massive galaxies at z~3, all the way to the final coalescence driven by GW emission. The two SMBHs, with masses ~10^8 MSOL, settle quickly in the nucleus of the merger remnant. The remnant is triaxial and extremely dense due to the dissipative nature of the merger and the intrinsic compactness of galaxies at high redshift. Such properties naturally allow a very ef?cient hardening of the SMBH binary. The SMBH merger occurs in only ~10 Myr after the galactic cores have merged, which is two orders of magnitude smaller than the Hubble time. We show by numerical simulations that a purely stellar dynamical model composed of an exponential disc, a cuspy bulge, and a Navarro-Frenk-White halo with parameters relevant to the Milky Way is subject to bar formation. Taking into account the ?nite disc thickness, the bar formation can be explained by the usual bar instability, in spite of the presence of an inner Lindblad resonance, that is believed to damp any global modes. It is shown thatwhile the e-folding time of bar instability increases significantly (from250 to 500Myr), the bar pattern speed remains almost the same. We investigate the evolution of the luminous (stellar) and dark (faint stars and stellar remnants) GC components and create mock observations of the simulations (i.e. photometry, colour-magnitude diagrams, surface brightness and velocity dispersion profiles). By connecting internal processes to observable features, we highlight the formation of a long-lived 'dark' nuclear subsystem made of BHs, which results in a two-component structure. The inner core is dominated by the BH subsystem and experiences a core-collapse phase within the first Gyr. The outer extended core - commonly observed in the (luminous) surface brightness profiles - shows no collapse features and is continuously expanding. We carried out processing and analysis of the spectra of 650 galaxies for the new release date of the panoramic spectral survey CALIFA DR3 (Calar Alto Legacy Integral Field Area) in 2016 year. Based on the the intensities of the emission lines computed in grid environment we studied global azimuthal asymmetry of the oxygen content in the disks of galaxies from CALIFA survey. It has been established that there is no significant global azimuthal asymmetries in our sample of galaxies, ie, the asymmetry was usually less than 0.05 dex. Significant (perhaps dominant) part of asymmetry may be due to the uncertainty of the geometric parameters of galaxies. Product Description popup.authors Іванов Д.Д. Берцик Петер Петерович Велесь Олександр Анатолійович Зінченко І.А. Соболенко М.О. popup.nrat_date 2020-04-02 Close