The Southern Stellar Stream Spectroscopic Survey (S5)

Dr. Ting Li
Fermilab​​​​​​​

Recently, more than a dozen new stellar streams in the Milky Way were discovered in the southern hemisphere with the Dark Energy Survey (DES). In this talk, I will present an ongoing spectroscopic program S5, which maps these southern streams with the 2df/AAOmega spectrograph on the Anglo-Australian Telescope. S5 is the first systematic program pursuing a complete census of known streams in the southern hemisphere. The radial velocities and stellar metallicities from S5, together with the proper motions from Gaia DR2, provide a unique sample to understand the Milky Way halo populations, the progenitors and formation of the streams, the mass and shape of the Milky Way potential, and to test the characteristics of dark matter. So far, the S5 program has obtained the 6D+1 (metallicity) phase space information for 10 streams in the DES footprint, all of which are the first-time measurements for these southern streams, and we are expanding our program beyond the DES footprint to cover more southern streams. I will give an overview of the S5 program, including target selection, observation, and data analysis, and I will end with a discussion of the implications of the preliminary results from S5.

Neutrino emission from the blazar TXS 0506+056

Dr. Joshua Wood
WIPAC, University of Wisconsin…

Presented by: Prof. Christopher Kolda

During the past few years, physicists have finally completed their century-long program of building a fundamental and unified picture of all known particles found in nature, only to find that key pieces are still missing. In this talk, we will show how our world works at its most fundamental levels, where the gaping holes in our knowledge remain, and how we plan to fill many of these holes in this new century.…

Part of the Our Universe Revealed Lecture Series

Title TBA

Prof. Christopher Kolda
Department of Physics
University of Notre Dame…

Pigmy resonances, neutron skins and neutron stars

Prof. Carlos Bertulani
Department of Physics & Astronomy
Texas A&M

Hosted by Prof. Mathews…