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Events During the Week of November 26th through December 2nd, 2023

Monday, November 27th, 2023

No events scheduled

Tuesday, November 28th, 2023

Finding Radio-Loud Strong Gravitational Lenses Using Large Surveys
Time: 2:30 pm - 6:00 pm
Place: B343 Sterling
Speaker: Michael Martinez, Physics PhD Graduate Student
Abstract: Strong Gravitational Lensing, the phenomenon by which a background source is magnified and split into multiple images by a massive foreground object, is one of the most versatile tools to modern astrophysicists, with applications to everything from studying high-redshift galaxy evolution to measuring the Hubble Constant. As lensing is sensitive to all mass along the line of sight from the lensed source to the Earth, it offers sensitivity to dark matter halos even if no luminous stellar population is present. Radio wavelength Very Long Baseline Interferometry (VLBI) observations, which provide milliarcsecond resolution and complement existing optical and infrared studies, are ideal for measuring the perturbations caused by these low-mass halos. In this talk, I present the results of a pilot project to discover new radio-loud gravitationally lensed sources. Using Very Large Array (VLA) follow-up to VLA Sky Survey (VLASS) selected lens candidates, we report 5 new radio-loud gravitational lenses, a 10% increase in the present sample size. I will also discuss plans for future observations in which we expect to further extend this sample by 50%, laying the groundwork for a statistically robust VLBI program to provide new constraints on dark matter.
Host: Keith Bechtol
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Wednesday, November 29th, 2023

PeV Neutrino Astronomy with IceCube
Time: 1:45 pm - 3:45 pm
Place: B343 Sterling
Speaker: Emre B. Yildizci, Physics PhD Graduate Student
Abstract: In the past, Icecube diffuse neutrino analyses at high energies have utilized event selections with contained and non-contained vertices separately. I have started to investigate the possibility of a unified, combined analysis approach. This approach promises a significant enhancement in selection efficiency for the highest-energy neutrinos. Additionally, I have studied novel techniques to reject background from cosmic ray muons. I will present our initial findings and the plan for completing the analysis.
Host: Lu Lu
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Thursday, November 30th, 2023

No events scheduled

Friday, December 1st, 2023

No events scheduled