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  • Other Sources  (4)
  • Astronomy  (4)
  • FLUID MECHANICS AND HEAT TRANSFER
  • Numerical Analysis
  • 2005-2009  (4)
  • 1995-1999
  • 1970-1974
  • 2009  (4)
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  • 2005-2009  (4)
  • 1995-1999
  • 1970-1974
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  • 1
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    Observing Merging Massive Black Hole Binaries with LISA (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: The Laser Interferometer Space Antenna (LISA) is expected to detect gravitational radiation from the inspiral and merger of massive black hole binaries at high redshifts with large signal-to-noise ratios (SNRs). These high-SNR observations will make it possible to extract physical parameters such as hole masses and spins, luminosity distance, and sky position from the observed waveforms. LISA'S effectiveness as a tool for astrophysics will be influenced by the precision with which these parameters can be measured. In addition, the practicality of coordinated observations with other instruments will be affected by the temporal evolution of parameter errors such as sky position. We present estimates of parameter errors for the special case of non-spinning black holes. Our focus is on the contribution of the late inspiral and merger portions of the waveform, a regime which typically dominates the SNR but has not been extensively studied due to the historic lack of a precise description of the waveform. Advances in numerical relativity have recently made such studies possible. Initial results suggest that the portion of the waveform beyond the Schwarzchild inner-most stable circular orbit can reduce parameter uncertainties by up to a factor of two.
    Keywords: Astronomy
    Type: 2009 Meeting of the American Physical Society; May 02, 2009 - May 05, 2009; Colorado; United States
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  • 2
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    Mercury's Atmosphere and Magnetosphere: MESSENGER Third Flyby Observations (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: MESSENGER's third flyby of Mercury en route to orbit insertion about the innermost planet took place on 29 September 2009. The earlier 14 January and 6 October 2008 encounters revealed that Mercury's magnetic field is highly dipolar and stable over the 35 years since its discovery by Mariner 10; that a structured, temporally variable exosphere extends to great altitudes on the dayside and forms a long tail in the anti-sunward direction; a cloud of planetary ions encompasses the magnetosphere from the dayside bow shock to the downstream magnetosheath and magnetotail; and that the magnetosphere undergoes extremely intense magnetic reconnect ion in response to variations in the interplanetary magnetic field. Here we report on new results derived from observations from MESSENGER's Mercury Atmospheric and Surface Composition Spectrometer (MASCS), Magnetometer (MAG), and Energetic Particle and Plasma Spectrometer (EPPS) taken during the third flyby.
    Keywords: Astronomy
    Type: American Geophysical Union (AGU) 2009 Fall Meeting; Dec 14, 2009 - Dec 18, 2009; San Francisco, CA; United States
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  • 3
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    Black Holes, Gravitational Waves, and LISA (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Binary black hole mergers are central to many key science objectives of the Laser Interferometer Space Antenna (LISA). For many systems the strongest part of the signal is only understood by numerical simulations. Gravitational wave emissions are understood by simulations of vacuum General Relativity (GR). I discuss numerical simulation results from the perspective of LISA's needs, with indications of work that remains to be done. Some exciting scientific opportunities associated with LISA observations would be greatly enhanced if prompt electromagnetic signature could be associated. I discuss simulations to explore this possibility. Numerical simulations are important now for clarifying LISA's science potential and planning the mission. We also consider how numerical simulations might be applied at the time of LISA's operation.
    Keywords: Astronomy
    Type: Computational Relativistic Astrophysics; Oct 22, 2009 - Oct 24, 2009; Princeton, NJ; United States
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  • 4
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    The Status of the Mock LISA Data Challenges (2009)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: For the last four years, many gravitational-wave researchers around the world have participated in the Mock LISA Data Challenges (MLDCs), a program to demonstrate and encourage the development of LISA data-analysis capabilities, tools and techniques. In this poster, we present a summary of the results of MLDC 3, which was completed in 2009. During MLDC 3, 27 participants from 15 institutions successfully analyzed data sets that included Galactic binaries, coalescing spinning massive black holes, extreme-mass-ratio inspirals, cosmic-string cusp bursts and a stochastic gravitational-wave background. We also describe the technical and scientific challenges that will be addressed by future MLI)Cs, starting with MLDC 4, which is currently in progress.
    Keywords: Astronomy
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