2018 Annual Fall Meeting of the APS Ohio-Region Section
Volume 63, Number 15
Friday–Saturday, September 28–29, 2018;
University of Toledo, Toledo, Ohio
Session A01: Astronomy , Astrophysics, and Space Science
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Chair: Nicole Karnath, The University of Toledo
Room: SU 2582
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Friday, September 28, 2018
1:30PM - 1:45PM
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A01.00001: A New Potential-Density Pair for Spherical Star Systems
Benjamin Joseph Amend, Stephen Alexander
I present a new potential-density pair for use in computational simulations of spherically symmetric star systems. My model contains a finite-density core and results in an r-4 density falloff at large radii. I produce velocity dispersion profiles for five different Milky Way globular clusters, and compare them to dispersion profiles constructed from observational data. These results are also checked against the Plummer model to examine their relative accuracies. I find that both models are in great agreement with observation, producing dispersion profiles that match collected data to a high degree. |
Friday, September 28, 2018
1:45PM - 2:00PM
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A01.00002: Latest Results in the Search for Ultra-High Energy Neutrinos in the Askaryan Radio Array
Brian Clark
Ultra-high energy (>10 PeV) neutrinos encode unique information about the distant, high energy universe—including the composition of cosmic rays and the nature of astrophysical accelerators. The Askaryan Radio Array (ARA) is a gigaton telescope under construction at the South Pole to detect these rare particles (<1 km^3/year). By burying arrays of antennas 200 m in the Antarctic ice sheet, ARA seeks to observe neutrinos by measuring the broadband, radio impulse that accompanies neutrino-nucleon interactions in ice. Five stations have been deployed so far. In this talk, I will present the latest progress in our search for neutrinos in four years of data from two stations.
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Friday, September 28, 2018
2:00PM - 2:15PM
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A01.00003: Extracting X-rays, Gamma-Rays, and Electron-Positron (e-e+) Pairs from the Ergosphere of Rotating Black Holes Using Penrose Scattering Processes
Reva-Kay Williams
Theoretical fully relativistic 4D model calculations involving Monte Carlo computer simulations of Compton scattering and e-e+ pair production processes, in the ergosphere of supermassive or stellar size rotating black holes, are presented. Particles from an accretion disk surrounding the black hole fall into the ergosphere and scatter off particles that are in bound equatorial and nonequatorial confined orbits. The Penrose mechanism, in general, allows rotational energy of a Kerr (rotating) black hole to be extracted by scattered particles escaping from the ergosphere to large distances. The energy-momentum four vectors are calculated for the scattered escaping particles. Particles escape in the form of bi-polar jets with energies as high as 54 GeV. These calculations show that the Lense-Thirring effect, i.e., the dragging of inertial frames into rotation, caused by the angular momentum of the black hole, results in a “gravitomagnetic” Coriolis-like force being exerted on the scattered particles. The effect of this force on the escaping particles is discussed as well as the luminosities and energy-momenta attained. Such escaping particles are observed in objects we believed to be powered by black holes: center of galaxies, quasars, microquasars, and gamma-ray bursts.
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Friday, September 28, 2018
2:15PM - 2:30PM
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A01.00004: Abstract Withdrawn
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