GALAXIES and COSMOLOGY department
INSTITUTE of ASTRONOMY and NAO
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:: INDIVIDUAL GALAXIES ::


Our current research is focused on:

Nuclear activity in galaxies

Starbursts in active galaxies

Galaxy interactions and mergers can induce inflows sufficient to trigger both starburst and nuclear activity. The interrelationship between star formation (SF) and accretion onto massive black holes is crucial to understanding galaxy formation and nuclear activity triggering. We address this issue from two perspectives:

Galaxy interactions

Theory, numerical simulations, and observations show that mergers, together with tidal interactions, could induce tails, bridges, shells, bars, and various types of disturbed spiral structure and asymmetries. As a result nuclear activity and/or starburst could be induced. However, the straightforward relation between AGNs and interactions is hard for deriving. We have studied it in several aspects:

Study of the nuclear variability on various time scales

Galaxy parameters

A homogeneous set of global (ellipticity, position angle, inclination, and total magnitude) and isophotal (semi-major axis and colour indices at the 24 V mag arcsec-2) parameters of galaxies have been estimated. They can be further used in various galactic structure studies. A set of bar parameters are also reported. Regarding bar length estimation, we used a method, based on the relation between the behaviour of the profiles and orbit analysis. The so estimated bar length tightly correlates with the semi-major axis, corresponding to the ellipticity maximum. There is a correlation between the deprojected bar length and the corrected isophotal semi-major axis. The deprojected relative bar length and bar ellipticity show no clear correlation.

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