Bulletin of the American Physical Society
Joint Fall 2017 Meeting of the Texas Section of the APS, Texas Section of the AAPT, and Zone 13 of the Society of Physics Students
Volume 62, Number 16
Friday–Saturday, October 20–21, 2017; The University of Texas at Dallas, Richardson, Texas
Session N1: Astro IV |
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Chair: Lindsay King, University of Texas at Dallas Room: DGAC 1.102A |
Saturday, October 21, 2017 2:30PM - 2:54PM |
N1.00001: Astrophysical searches for particle dark matter Invited Speaker: Louis Strigari Dark matter comprises the majority of the mass density of the universe, yet its identity is unknown. Well-motivated theories predict that dark matter is a new elementary particle of nature, which may be detected through a variety of astrophysical and terrestrial experiments. In this talk, I will discuss the recent progress that has been made using astroparticle experiments, focusing on direct searches with underground detectors, and experiments searching for high energy gamma-rays and cosmic rays produced by dark matter interactions. I will discuss the theoretical parameter space that these experiments are now probing, and highlight the progress and the possible ultimate limitations of forthcoming dark matter experiments. [Preview Abstract] |
Saturday, October 21, 2017 2:54PM - 3:06PM |
N1.00002: Astrophysical J-Factors for Dwarf Spheroidal Satellite Galaxies Andrew Pace, Louis Strigari Local dwarf spheroidal satellite galaxies are an attractive target for searches of dark matter annihilation. They are dark matter dominated systems with little to no astrophysical backgrounds. The best limits for the indirect detection of dark matter in the ~100 GeV range are set with gamma-ray searches of dwarf spherical galaxies with the Fermi Large Area Telescope. One key ingredient in this process is the integrated dark matter distribution (J-Factor) within these galaxies. We present the first calculations of the J-Factor for several recently discovered dwarf spheroidal galaxies and update the J-Factors for other satellites. With our results we create scaling relations for the J-Factor based on the distance, size, and internal motions of the dwarfs. The inclusion of additional satellites with accurate J-Factors will assist in determining the nature of dark matter. [Preview Abstract] |
Saturday, October 21, 2017 3:06PM - 3:18PM |
N1.00003: Dwarf Satellite Galaxies in the Dark Energy Survey Jennifer Marshall In recent years, wide-field imaging survey data from the Dark Energy Survey have been used to discover many new candidate ultra-faint dwarf galaxies in the nearby Universe, nearly doubling the number of known satellites. Detailed kinematic followup study of these objects has confirmed that many of these objects are indeed low luminosity, dark matter dominated dwarf galaxies, while chemical abundance analysis of their brightest member stars has revealed a surprising variety of chemical evolution histories in these objects. I will present recent results from the Dark Energy Survey and associated followup, and will discuss the implications for galaxy formation, star formation, and dark matter studies. [Preview Abstract] |
Saturday, October 21, 2017 3:18PM - 3:30PM |
N1.00004: Chemical Abundance Measurements of Ultra-Faint Dwarf Galaxies Discovered by the Dark Energy Survey Daniel Nagasawa, Jennifer Marshall, Joshua Simon, Terese Hansen, Ting Li, Rebecca Bernstein, Eduardo Balbinot, Alex Drlica-Wagner, Andrew Pace, Louis Strigari, Craig Pellegrino, Darren DePoy, Nicholas Suntzeff, Keith Bechtol Ultra-faint dwarf galaxies preserve a fossil record of the chemical abundance patterns of some of the first stars formed in the Universe. High resolution spectroscopic observations of member stars of some of the most recently discovered Milky Way satellites have revealed a range of abundance patterns among ultra-faint dwarfs suggesting that star formation processes in the early Universe were quite diverse. The chemical content of member stars in these objects provides a glimpse not only into the various nucleosynthetic processes and chemical history of the objects themselves but also into the environment in they were formed. In this talk, I will discuss recent chemical abundance measurements of member stars in multiple ultra-faint dwarf galaxies that have been discovered by the Dark Energy Survey. [Preview Abstract] |
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