Bulletin of the American Physical Society
2019 Annual Meeting of the APS Four Corners Section
Volume 64, Number 16
Friday–Saturday, October 11–12, 2019; Prescott, Arizona
Session E01: Astrophysics I |
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Chair: Stacy Palen, Weber State University Room: AC1 114 |
Friday, October 11, 2019 2:48PM - 3:12PM |
E01.00001: Recent Results from Advanced LIGO Invited Speaker: Brennan Hughey Advanced LIGO's third Observing Run began on April 1st 2019, and the last six months have brought new gravitational wave detections at an unprecedented pace. In this talk, I'll discuss recent highlights of the four-year-old field of gravitational wave astronomy, including LIGO's real-time public alerts and astrophysically interesting candidates such as the likely first-ever observation of a black hole swallowing a neutron star. [Preview Abstract] |
Friday, October 11, 2019 3:12PM - 3:24PM |
E01.00002: NuSTAR Observations of ABELL 2163: Constraining Non-Thermal Emission Randall Rojas, Daniel Wik, Qian Wang Since the first non-thermal detections of inverse Compton (IC) emission in galaxy clusters at hard X-ray energies, we have yet to unambiguously confirm IC in follow-up observations. Claims of large IC fluxes from the 10' extent of Abell 2163, a massive merging cluster at z = 0.2, make it the next best chance of confirming a previous IC detection with NuSTAR. To confirm IC detections we implement three separate models: a one temperature model, a multi-temperature model, and a single temperature + power law model (which models IC scattering) and use statistical methods to determine the best model for the temperature distribution of the intracluster medium. We find that the global NuSTAR spectrum is consistent with pure thermal emission, with a global temperature of $kT = (11.77 \pm 0.13)$ keV. Our model provides a constraint on IC emission of $1.62 \times 10^{-12}$ergs$^{-1}$cm$^{-2}$ as well as a value for the magnetic field of the cluster, B $>$ 0.22 $\mu$G or B $>$ 0.35 $\mu$G using the normalization obtained from a nine temperature model, which fall between previous measurements made in other studies. [Preview Abstract] |
Friday, October 11, 2019 3:24PM - 3:36PM |
E01.00003: Gamma-ray Bursts in Inhomogeneous Interstellar Media Jacob Fields, David Neilsen, Eric Hirschmann, Matthew Anderson Gamma-ray bursts (GRBs) are among the most luminous electromagnetic phenomena in the known universe, but there is still much unknown about them. In particular, long GRBs show a high degree of variability in measured light intensity. Using a relativistic hydrodynamics simulation, we test the possibility that some of this variation might be due to interactions between a GRB blast wave and a dense, circumstellar shell of matter, similar to what might be generated by an aging star expelling the outer layers of its atmosphere. [Preview Abstract] |
Friday, October 11, 2019 3:36PM - 3:48PM |
E01.00004: Modeling a Fermion Telescope Detector Emma Rasmussen, John E. Ellsworth Laboratory nuclear astrophysics reactions typical of stellar energies are becoming of great interest. We wish to validate an observation of conversion electrons from p-chain type stellar reactions in condensed matter. To extend the capabilities of a typical silicon delta-E/E charged particle detector to include conversion electrons we are adding a plastic calorimeter. Reported here is the effort to model the detector using Geant4 simulation software. [Preview Abstract] |
Friday, October 11, 2019 3:48PM - 4:00PM |
E01.00005: Gravitational Wave Calibration Error for Supernovae Core Collapse Brad Ratto, Michele Zanolin The existence of gravitational waves reveals yet another method in which information is transmitted across the cosmos, bringing with its further insight into the inner workings of our universe. However, the instrument induces distortions in the gravitational waves. In this talk I will describe these effects, how the laser interferometers software tries to correct for them, and how the data analysis algorithms attach errors on the estimated physical parameters. The explicit examples come from GWs from Core collapse Supernovae. [Preview Abstract] |
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