Bulletin of the American Physical Society
2020 Annual Meeting of the APS Four Corners Section (Virtual)
Volume 65, Number 16
Friday–Saturday, October 23–24, 2020; Albuquerque, NM (Virtual)
Session B01: Astrophysics ILive
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Chair: Daniel Wik, Univ. Utah |
Friday, October 23, 2020 10:30AM - 10:54AM Live |
B01.00001: When Galaxy Clusters Collide: Recent Results from the NuSTAR and Chandra X-ray Observatories Invited Speaker: Daniel Wik Clusters of galaxies are the most massive gravitationally bound structures in the universe, growing through mergers with galaxies and other galaxy clusters. Collisions between clusters release huge amounts of energy---more than any other event since the Big Bang. Hot, X-ray emitting gas fills the volume between the galaxies in clusters, and cluster-cluster collisions drive shock waves and turbulence through the gas, which can also accelerate cosmic ray electrons and ions to close to the speed of light. I will present work on several different merging galaxy clusters observed with the X-ray telescopes NuSTAR and Chandra, where we expect to find shock fronts in X-ray images---and sometimes do---and evidence for cosmic ray electrons---which we generally do not. These results will be discussed in the larger context of how galaxy clusters grow and evolve over time and their implications for using clusters as a way to study cosmology. [Preview Abstract] |
Friday, October 23, 2020 10:54AM - 11:06AM Live |
B01.00002: Simulating the EUSO-SPB2 Balloon Flight Train with Lagrangian Mechanics Ryan Morgenstern EUSO-SPB2 is a long duration balloon experiment that will fly two optical astroparticle telescopes; a fluorescence telescope and a Cherenkov telescope. These telescopes have a 0.1 degree pointing resolution requirement. The telescope of interest is the on-board Cherenkov telescope that rotates above/below the Earth’s limb to observe extensive air showers and tau neutrinos backgrounds. Rotating the Cherenkov telescope induces motion in the gondola. Motion in the gondola exceeding the 0.1 degree resolution requirement may affect data. This presentation analyzes and simulates this telescope induced gondola motion to determine if dampening methods are required. The simulation model is additionally tested against a wood built small-scale payload with an internal rotating telescope. With this experimental basis, the simulation model accurately scales to the measured motion of the different motors and payload suspensions used. The simulation model is then built for the EUSO-SPB2 payload and flight train. Results predicted telescope induced gondola motion $\phi \leq 0.008$ degree. With proven confidence in the simulation model, EUSO-SPB2’s on-board telescopes’ data will not be affected by the Cherenkov telescope rotation. Partially funded by NASA grant NNX13AH55G. [Preview Abstract] |
Friday, October 23, 2020 11:06AM - 11:18AM Live |
B01.00003: Gravitational Wave Memory from Asymmetric Core-Collapse Supernovae Colter Richardson, Michele Zanolin, Haakon Andresen, Kiranjyot Gill, Marek Szczepanczyk, Annop Wongwathanarat Gravitational wave memory from core-collapse supernova is the permanent deformation of spacetime. This memory hints at asymmetries in the CCSN's explosion morphology. We introduce three models for explosion morphology: 1. A prolate (cigar shaped) explosion that forces the matter and neutrino emission to follow two jets along the positive and negative z-axis, 2. An oblate (disk shaped) explosion that forces the material emission radially in the x-y plane, and 3. A spheroidal explosion which forces the material to expand radially in all directions with parameters to control how prolate, oblate, elliptical, or spherical the explosion is. These morphologies are tested against the W15-2 CCSN model (a nonrotating 15M$\odot $~progenitor), here we define the memory at the end of the neutrino simulation. Because this example case does not have a complete memory due to the truncation of the simulation, we introduce methods to extend a GW signal to a final memory value. We also introduce a methodology to emulate the detector response of GW detectors to this permanent deformation. Finally, we investigate the possibilities for detecting memory signals in current and future GW detectors, using the coherent Wave Burst pipeline developed to detect transient GW burst signals. [Preview Abstract] |
Friday, October 23, 2020 11:18AM - 11:30AM Live |
B01.00004: EUSO-SPBII mission and calibration Viktoria Kungel, Lawrence Wiencke The Extreme Universe Space Observatory - Super Pressure Balloon (EUSO-SPBII) mission will measure \v{C}erenkov- and fluorescence-emission of ultra-high energy cosmic rays (UHECR) and search for $\tau$-neutrinos. The instrument will have UV/UV-visible sensitivity to measure PeV and EeV-scale cosmic rays. The planned launch date is 2023 from Wanaka, New Zealand, with a flight duration target of 100 days. \\ The payload consists of two optical 1-meter aperture telescopes. The fluorescence telescopes points down. Its field of view is FoV$_{FD} = 3\times \left(11 \times 11\right)^o$. The \v{C}erenkov telescopes points towards the Earth's limb. Its field of view is FoV$_{CH} = \left( 6.4\times 12.8 \right) ^o$. Telescope integration and laboratory calibration will be performed in Golden, Colorado. The main parameters determined in laboratory tests are the the point spread function (PSF) and the efficiency of the integrated telescope. An 1-m diameter parallel test beam will be used in these tests. Field tests will include an end-to-end test of the fully integrated instruments with the help of a steerable laser system, point sources and stars. A goal of the field campaign is the validation of the trigger threshold. [Preview Abstract] |
Friday, October 23, 2020 11:30AM - 11:42AM |
B01.00005: Precision controls for the Virtual Telescope for X-ray Observations (VTXO) Reza Pirayeshshirazinezhad, Sandra Biedron, Jorge Diaz Cruz, Manel Martinez, Salvador Sosa The Virtual Telescope for X-ray Observations (VTXO) is a mission exploiting two 6U-CubeSats operating in a precision formation. The goal of the VTXO project is to develop a space-based, X-ray imaging telescope with high angular resolution precision. X-rays are~linked to the Universe's highest energy phenomena and an order of magnitude increase in the spatial resolution would provide a window to the underlying physical processes of the high-energy universe. This technology would enable high-resolution imaging of the~X-rays from solar flares and the detailed mapping of the X-ray production in energetic objects such as Active Galactic Nuclei. In this scheme, one CubeSat carries a diffractive lens and the other one carries an imaging device to support a focal length of 1~km. In this mission, attitude control and relative position control algorithms are required to keep the formation of the two spacecraft in alignment with the Crab Nebula observations. To meet the attitude control goal, the attitude measurements from the gyros~and the star trackers are used in conjunction with controls and machine learning algorithms (ML) to hold the CubeSats in a precise formation with the required high attitude accuracy using minimal power.~ [Preview Abstract] |
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