Seminars
Our seminars take place in the lecture room of the building at
Praha–Sporilov.
Next seminar:
04.02.2014 15:00
Norbert Werner
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University
The Astro-H X-ray observatory
Abstract
Norbert Werner
The Astro-H X-ray observatory
I will talk about the upcoming Astro-H satellite, the next large international X-ray observatory. Astro-H will carry the first high-resolution X-ray imaging spectrometers and will provide an unprecedented wide band coverage that will revolutionize the study of the physics of X-ray plasmas. I will summarize the technical capabilities of the satellite and will present some of the most exciting science goals that we expect to reach with this mission.
Previous seminar:
27.01.2014 15:00
Frantisek Dinnbier
Astronomical Institute, Academy of Sciences, Prague
Propagating star formation in swept-up shells
Abstract
Frantisek Dinnbier
Propagating star formation in swept-up shells
Shells of swept-up gas are commonly observed at borders of HII regions
and interstellar bubbles. As they expand and accrete new mass, they can
fragment and form new stars. If massive stars are formed, they create
new bubbles and this scenario repeats leading to propagation of star
formation. Despite the importance of shell fragmentation, there is no
consonance in literature how long the unstable wavelengths are and how
fast they grow, especially in the case of higher values of pressure that
confines the shell. In my work I study fragmentation of such shells by
hydrodynamic simulations including a self gravity. A shell which is a
subject to my study is thick and stratified in a direction perpendicular
to its surface. At larger distances, it is truncated by the external
pressure from both sides. I will present first results where I study the
fragment growth rate as a function of the external pressure and compare
my results with analytical estimates made by another authors in the past.
If you would like to give a seminar in our group, please contact Vladimir Karas or Jaroslav Hamersky.
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