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  • 1
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    Hopes for the year ahead (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-01-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fernandez-Capetillo, Oscar -- Yan, Nieng -- Dionne, Jen -- Bassett, Danielle -- Sebastian, Suchitra -- Hendon, Christine -- Schlichting, Hilke -- Baker, Monya -- England -- Nature. 2015 Jan 1;517(7532):111-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25568916" target="_blank"〉PubMed〈/a〉
    Keywords: Age Factors ; Aging/genetics ; Astronomy ; Biomedical Engineering/trends ; Cryoelectron Microscopy ; DNA Damage ; Diagnostic Imaging ; Humans ; Interdisciplinary Communication ; Interdisciplinary Studies ; Nanostructures/radiation effects ; Neoplasms/genetics ; Neurosciences/trends ; Planets ; Research/*trends ; *Research Personnel/psychology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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    PAPER CURRENT
  • 2
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    Community Plan for Far-Infrared/Submillimeter Space Astronomy (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: This paper represents the consensus view of the 124 participants in the Second Workshop on New Concepts for Far-Infrared/Submillimeter Space Astronomy.We recommend that NASA pursue the vision for far-IR astronomy outlined in the NAS Decadal Survey, which said: A rational coordinated program for space optical and infrared astronomy would build on the experience gained with NGST1 to construct [a JWST-scale filled-aperture far-IR telescope SAFIR, and then ultimately, in the decade 2010 to 2020, build on the SAFIR, TPF, and SIM experience to assemble a space-based, far-infrared interferometer. SAFIR will study star formation in the young universe, the buildup of elements heavier than hydrogen over cosmic history, the process of galaxy formation, and the early phases of star formation, which occur behind a veil of dust that precludes detection at mid IR and shorter wavelengths. The far-infrared interferometer will resolve distant galaxies to study protogalaxy interactions and mergers and the processes that led to enhanced star formation activity and the formation of Active Galactic Nuclei, and will resolve protostars and debris disks in our Galaxy to study how stars and planetary systems form.
    Keywords: Astronomy
    Type: New Concepts for Far-Infrared and Submillimeter Space Astronomy; XV-XXVI; NASA/CP-2003-212233
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Gauge Conditions for Moving Black Holes Without Excision (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: Recent demonstrations of unexcised, puncture black holes traversing freely across computational grids represent a significant advance in numerical relativity. Stable an$ accurate simulations of multiple orbits, and their radiated waves, result. This capability is critically undergirded by a careful choice of gauge. Here we present analytic considerations which suggest certain gauge choices, and numerically demonstrate their efficacy in evolving a single moving puncture.
    Keywords: Astronomy
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  • 4
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    Mergers of Non-spinning Black-hole Binaries: Gravitational Radiation Characteristics (2008)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We present a detailed descriptive analysis of the gravitational radiation from black-hole binary mergers of non-spinning black holes, based on numerical simulations of systems varying from equal-mass to a 6:1 mass ratio. Our primary goal is to present relatively complete information about the waveforms, including all the leading multipolar components, to interested researchers. In our analysis, we pursue the simplest physical description of the dominant features in the radiation, providing an interpretation of the waveforms in terms of an implicit rotating source. This interpretation applies uniformly to the full wavetrain, from inspiral through ringdown. We emphasize strong relationships among the l = m modes that persist through the full wavetrain. Exploring the structure of the waveforms in more detail, we conduct detailed analytic fitting of the late-time frequency evolution, identifying a key quantitative feature shared by the l = m modes among all mass-ratios. We identify relationships, with a simple interpretation in terms of the implicit rotating source, among the evolution of frequency and amplitude, which hold for the late-time radiation. These detailed relationships provide sufficient information about the late-time radiation to yield a predictive model for the late-time waveforms, an alternative to the common practice of modeling by a sum of quasinormal mode overtones. We demonstrate an application of this in a new effective-one-body-based analytic waveform model.
    Keywords: Astronomy
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    NASA TECHNICAL REPORTS
  • 5
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    The High Energy Telescope for STEREO (2008)
    In:  CASI
    Details
    Publication Date: 2018-08-10
    Description: The IMPACT investigation for the STEREO Mission includes a complement of Solar Energetic Particle instruments on each of the two STEREO spacecraft. Of these instruments, the High Energy Telescopes (HETs) provide the highest energy measurements. This paper describes the HETs in detail, including the scientific objectives, the sensors, the overall mechanical and electrical design, and the on-board software. The HETs are designed to measure the abundances and energy spectra of electrons, protons, He, and heavier nuclei up to Fe in interplanetary space. For protons and He that stop in the HET, the kinetic energy range corresponds to approx. 13 to 40 MeV/n. Protons that do not stop in the telescope (referred to as penetrating protons) are measured up to approx. 100 MeV/n, as are penetrating He. For stopping He, the individual isotopes He-3 and He-4 can be distinguished. Stopping electrons are measured in the energy range approx. 0.7 - 6 MeV.
    Keywords: Astronomy
    Type: To appear in Space Science Reviews
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    NASA TECHNICAL REPORTS
  • 6
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    Autonomous volcanic activity detection with ASE on EO-1 Hyperion: applications for planetary missions (2003)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Astronomy
    Type: Division for Planetary Sciences Meeting of the American Astronomical Society-35; Monterey, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Characterizing Black Hole Mergers (2010)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Binary black hole mergers are a promising source of gravitational waves for interferometric gravitational wave detectors. Recent advances in numerical relativity have revealed the predictions of General Relativity for the strong burst of radiation generated in the final moments of binary coalescence. We explore features in the merger radiation which characterize the final moments of merger and ringdown. Interpreting the waveforms in terms of an rotating implicit radiation source allows a unified phenomenological description of the system from inspiral through ringdown. Common features in the waveforms allow quantitative description of the merger signal which may provide insights for observations large-mass black hole binaries.
    Keywords: Astronomy
    Type: 2010 American Physical Society Meeting; Feb 12, 2010 - Feb 17, 2010; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    SGO LOWEST: Cost Savings Through Payload Reduction in a Linear Configuration (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Astronomy
    Type: GSFC.CPR.5906.2012 , Workshop for Gravitation-Wave Mission Architectural Concepts; Dec 20, 2011 - Dec 21, 2011; Linthicum, MD; United States
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  • 10
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    Observation of an Anisotropy in the Galactic Cosmic Ray Arrival Direction at 400 TeV with IceCube (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this paper we report the first observation in the Southern hemisphere of an energy dependence in the Galactic cosmic ray anisotropy up to a few hundred TeV. This measurement was performed using cosmic ray induced muons recorded by the partially deployed IceCube observatory between May 2009 and May 2010. The data include a total of 33 x 10(exp 9) muon events with a median angular resolution of approx. 3 degrees. A sky map of the relative intensity in arrival direction over the Southern celestial sky is presented for cosmic ray median energies of 20 and 400 TeV. The same large-scale anisotropy observed at median energies around 20 TeV is not present at 400 TeV. Instead, the high energy skymap shows a different anisotropy structure including a deficit with a post-trial significance of -6.3 sigma. This anisotropy reveals a new feature of the Galactic cosmic ray distribution, which must be incorporated into theories of the origin and propagation of cosmic rays.
    Keywords: Astronomy
    Type: GSFC.ABS..5857.2012 , The Astrophysical Journal; 746; 1
    Format: text
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