and chemical abundance in galaxies,
systems of galaxies and the Universe are investigated. Photometry and Surface photometry
of normal and active galaxies and galaxies in Voids are carried
out. Disk profiles and starformation in galaxies are investigated. Structures of galaxies and clusters of galaxies
are searched. Some catalogs of the most massive structures are
compiled and the large scale structure
in the Universe is studied. Primordial
nucleosynthesis and chemical evolution of the light elements in the
presence of neutrino oscillations is analysed. Cosmological constraints on oscillation parameters
are obtained. Different baryogenesis
scenarios are investigated. Possibilities of antimatter in the Universe are studied.
Extragalactic Astronomy - The
field that deals with objects beyond the Milky Way, especially
galaxies and quasars.
Extragalactic Distance Scale
- The set of distances to astronomical objects outside our galaxy.
It is difficult to obtain distances to objects further than about
10 million light years with accuracies better than about 25%.
Nucleus - AGN -- An unusually bright
galactic nucleus whose light is not due to starlight. Active Galaxy -
Any galaxy which is emitting large quantities of
non-thermal radiation. (b) Active galactic nuclei are
very luminous (10^43-10^46 ergs s-1). Their energy
output is in two forms: nonthermal continuum and thermal
emission line. Astrophysics
- (a) The science that studies the physics and chemistry
of extraterrestrial objects. The alliance of physics and
astronomy, which began with the advent of spectroscopy,
made it possible to investigate what celestial objects
are and not just where they are. (b) All applications of
the laws of physics, chemistry and the other physical
sciences to the understanding of astronomical phenomena.
IAU commission 28 -
Old IAU commission 47 -
of colliding, interconnecting and merging of galaxies
For REVIEW papers see below...
Department "GALAXIES" - 2011 main projects:
Petrov , Institute of Astronomy, Bulgarian Academy of
Sciences, 72 - Tsarigradsko Chaussee, 1784-Sofia, Bulgaria
mail to: petrov[at]astro[dot]bas[dot]bg
The page is
Created at 28.12.2004 (Last updated at 24.03.2016) Basic location at Institute of Astronomy