7 papers
Gas Dynamics in Central Parts of Galaxies
Witold Maciejewski
Asymmetries in galactic potentials, either self-induced, or caused by a passing companion, play an important role in global gas dynamics in galaxies. In particular, they are able t…
Constraints on nested bars - implications for gas inflow
Witold Maciejewski
A wide-spread belief that nested bars enhance gas inflow to the galactic centre has recently been contradicted by dynamical models in which inner bars seem to prohibit such inflow.…
Simulations of Gas Flow from a Galactic Disk to the BH-dominated Central Disk
Witold Maciejewski
With a help of hydrodynamical models, we explore fundamental modes of gas flow in central parts of a galaxy potential with non-axisymmetric perturbations of various strengths. Our…
Gas kinematics from spectroscopy with a wide slit: detecting nuclear black holes
Witold Maciejewski, James Binney
Motivated by STIS observations of more than 50 nearby galactic nuclei, we consider long-slit emission-line spectra when the slit is wider than the instrumental PSF, and the target…
Black Holes in Centers of Disk Galaxies - Spectroscopy with a Wide Slit
Witold Maciejewski
Motivated by STIS observations of more than 50 nearby galactic nuclei, we consider long-slit emission-line spectra when the slit is wider than the instrumental PSF. The finite widt…
Centers of Barred Galaxies: Secondary Bars and Gas Flows
Witold Maciejewski
Active Galactic Nuclei (AGN) require mass accretion onto the central engine. On large galactic scales, torques from a stellar bar can efficiently remove angular momentum from gas,…