Physics Department Colloquia |
Events During the Week of April 18th through April 25th, 2010
Monday, April 19th, 2010
- No events scheduled
Tuesday, April 20th, 2010
- No events scheduled
Wednesday, April 21st, 2010
- No events scheduled
Thursday, April 22nd, 2010
- No events scheduled
Friday, April 23rd, 2010
- The Transient Revolution in Astrophysics
- Time: 4:00 pm
- Place: 2241 Chamberlin Hall (coffee at 3:30 pm)
- Speaker: Eliot Quataert, UC-Berkeley
- Abstract: The advent of large astronomical surveys based on rapid advances in detector technology and data storage is generating an unprecedented amount of data on time-variable astronomical objects, up to 100 Terabytes per night in the coming decade. In addition to providing new insights into a wide variety of known phenomena (e.g., variable stars, supernovae, and black holes), historical analogues suggest that these surveys are likely to discover entirely new classes of astronomical objects. I will illustrate the discovery potential of the current generation of astrophysical transient surveys by focusing on two concrete examples of "known unknowns." The first is a "kilonova" produced by the decay of heavy elements created during the merger of two neutron stars or a neutron star and a black hole; a similar transient can be produced during the collapse of a white dwarf to a neutron star. These events are particularly interesting since they are the likely progenitors of some gamma-ray bursts and are also the primary target for km-scale gravitational wave observatories such as Advanced LIGO. The second "known unknown" I will highlight is a ~ week-long electromagnetic flare produced by the tidal disruption of a star that passes close to the event horizon of a massive black hole at the center of a galaxy. The study and characterization of kilonovae and tidal disruption events in the coming years will open up a new window onto the physics and astrophysics of compact objects in the universe.
- Host: Forest and Zweibel