Events at Physics |
Events on Monday, February 1st, 2021
- Monday Science Seminar
- Monday Science Seminar w/ Benjamin Rosenwasser (UW-Madison)
- Time: 12:00 pm - 1:00 pm
- Place:
- Speaker: Benjamin Rosenwasser, University of Wisconsin - Madison
- Abstract: Over the past decade the Cosmic Origins Spectrograph (COS) has obtained high S/N FUV spectra of hundreds of distant QSOs, illuminating the gaseous structures that lie within the cosmic web at redshift < 1. Besides Lyman alpha forest absorption, the next most common type of absorber are low column density OVI absorbers, often appearing as apparent single components with one or two associated HI lines. Many studies have shown that the absorbers with large column densities are in the inner regions of galaxy halos, while the much more numerous single component OVI absorbers have not been the subject of much scrutiny. We have been studying a large sample of 600 OVI absorbers, and I will focus on our effort to characterize the galaxy environments of the common single component systems. We show that some appear to trace halos, but many are clearly isolated, and sometimes embedded within filamentary structure traced by nearby galaxies on Mpc scales. We discuss the possible origins and physical properties of the gas in this intra-filament medium.
- Host: Melinda Soares-Furtado
- Plasma Physics (Physics/ECE/NE 922) Seminar
- Real-time wall conditioning of fusion devices by injection of low-Z powders
- Time: 12:00 pm - 1:00 pm
- Place: Join Zoom Meeting
- Speaker: Alessandro Bortolon, PPPL
- Abstract: Join Zoom Meeting Meeting ID: 918 3541 9103 Passcode: 578475
- Host: Chris Hegna
- Plasma Theory Seminar
- MHD Transient Seeding of Disruptive Neoclassical Tearing Modes (NTMs)
- Time: 4:00 pm
- Place: Zoom Meeting
- Speaker: J. D. Callen, UW-Madison
- Abstract:
Join Zoom Meeting
Meeting ID: 954 878 7359
Passcode: 4Ugg1v
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Meeting ID: 954 878 7359
Passcode: 596249 - Host: Chris Hegna