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Where are all the supernova remnants? with Professor Bon-Chul Koo, Seoul National University

Friday 27 April 2012 - 8:00pm
Topic: Where are all the supernova remnants?
Speaker: Professor Bon-Chul Koo, Seoul National University
Venue: Epping Creative Centre - 26 Stanley Road, Epping
Abstract: Supernova is the manifestation of the violent, explosive death of a star. When a star explodes, it suddenly appears as a very bright new star but sooner or later disappears from the sky, which gave it the name ‘supernova’ or ‘guest star’ in western and eastern countries, respectively.

With modern telescopes, the remnants of such stellar explosions, supernova remnants (SNRs), can be observed in all wavebands, from radio to X-rays. In our Galaxy, the number of known SNRs is about three hundreds, most of which have been discovered in radio continuum or/and in X-rays. This number is much less than what we would expect from the Galactic supernova rate and their life time. Most SNRs are therefore missing.

In this talk, I first give a general introduction on SNRs and their observational characteristics. Then I show that the old missing SNRs can be identified by observing 21cm emission line from fast-moving hydrogen atoms accelerated by SNR shocks, and discuss the implications of SNR statistics on the structure of the interstellar medium.

Biography: Professor Bon-Chul Koo is a member of the astronomy faculty at the Seoul National University. He obtained his BS in Astronomy at Seoul National University and his MS in Physics from the Korea Institute of Science and Technology. He gained his PhD in Astronomy at The University of California, Berkeley. He was post doctoral fellow at the Harvard Smithsonian Center for Astrophysics before returning to Seoul National University.

 

Event Date: 
Friday, 27 April, 2012 - 20:00

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