Title: Missing metals and baryons in galaxies: Clues from our Milky Way Abstract: It is well-known that most galaxies are missing most of their baryonic mass. Perhaps more surprisingly, they also seem to be missing most of their metals. I will present Chandra observations probing our Milky Way halo in absorption. Together with XMM and Suzaku … Continue reading "CRA Seminar (Prof. Smita Mathur (Ohio State University))"
Title: Juggling gas and metals: exploring the role of outflows in galaxy evolution Abstract: The cycling of gas through galactic fountains links disks to halos. Simulations enable astronomers to follow … Continue reading "Prof. Charlotte Christensen (Grinnell College)"
Title: Puzzles of Galaxy Evolution Abstract: I will describe a pair of sharp puzzles suggesting a possible mismatch between our theory of galaxy evolution and recent observations. First, current models predict that the z ~ 4-8 universe should be a time in which the most massive galaxies are transitioning from their initial halo assembly to … Continue reading "Prof. Charles Louis Steinhardt (Niels Bohr Institute)"
============== Multi-messenger signals from gravitational wave sources Neutron star mergers had long been suspected to produce gravitational wave "chirps", gamma ray bursts and produce r-process elements. While overall convincing, all … Continue reading "Prof. Stephan Rosswog (Stockholm University)"
Title: Connecting the first galaxies with ultra-faint dwarfs in the local Universe. Abstract : Ultra-Faint Dwarf Galaxies (UFDs) are the least luminous systems and also the least metal- enriched systems. Their … Continue reading "CRA Seminar **Special Time** ( Myoungwon Jeon, U. Arizona )"
Cosmic-ray anisotropy searches with the Fermi Large Area Telescope Cosmic rays arrive at Earth nearly isotropically due to magnetic deflection during propagation. However, small anisotropy has now been measured in cosmic-ray nuclei over eight orders of magnitude in energy, from 100 GeV to 10^10 GeV. This anisotropy is an essential observable in the study of … Continue reading "CRA Seminar: Prof. Justin Vandenbroucke (UW Madison)"
Making a Universe with (Rel)axions The discovery of the Higgs boson reinforces the possibility that other similar, scalar particles may exist in nature. In this talk, I will begin by discussing one such dark matter and sometime inflaton candidate, the axion. I will describe the claim that dark matter axions form an exotic state of … Continue reading "CRA Seminar: Dr. Chanda Prescod-Weinstein (University of Washington, Seattle) **Special Time**"
100,000 Asteroids Down the Back of the Couch: A Novel Approach to the Minor Planet Linking Problem A number of ongoing surveys, such as Pan-STARRS, the Catalina Sky Survey, OSSOS, and NEOWISE, as well as planned surveys such as ZTF, LSST, and NEOCam, are designed to pursue goals ranging from constraining models of planet formation, … Continue reading "Matt Holman (Harvard CfA, director of Minor Planet Center)"
