[institut] Seminar Katedre za astronomiju 27. novembar 2018.

[Katedra za astronomiju]

                Seminar iz astronomije i astrofizike

                          Oleg Egorov

                 (SAI MSU & SAO RAS, Russia)

     "Feedback-driven superbubbles and triggering of star formation in
                   nearby dwarf galaxies"

     utorak, 27. novembar 2018. godine, u 18 sati, u ucionici 809.



Abstrakt:
Stellar feedback is important process regulating ISM morphology and
kinematics: cumulative action of winds and ionizing radiation from massive
stars with a following supernova explosions blow out superbubbles having
sizes from a few pc to several kpc. This process is especially important in 
dwarf irregular galaxies, which thick gaseous disk and lack of the density 
waves allow such structures to live longer and grow to a larger sizes than in 
spiral galaxies. The interaction of the giant HI supershells might trigger a 
new burst of star formation in a galaxy, while the influence of ongoing star 
formation in their rims might lead to dissolution of the HI structures. In our 
ongoing survey with the Russian 6-m telescope we study the gas morphology, 
kinematics and young stellar population in star-forming regions of nearby dwarf 
irregular galaxies. In my talk I will briefly review some results. Several tens 
of the ionized superbubbles were identified and analyzed (including old 
supernovae remnants); certain signs of propagating of star formation were 
found. We argue that at least in several galaxies the collision of the giant 
kpc-sized supershells plays important role in the triggering of a new burst of 
star formation.