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Open Access Publications from the University of California

Scholarly Works (12 results)

  • Article
Lawrence Berkeley National Laboratory (2002)

P-channel, backside illuminated silicon CCDs were developed and fabricated on high-resistivity n-type silicon. Devices have been exposed up to 1x1011 protons/cm2 at 12 MeV. The charge transfer efficiency and dark curent were measured as a function of radiation dose. These CCDs were found to be significantly more radiation tolerant than conventional n-channel devices. This could prove to be a major benefit for long duration space missions.

    Cover page: Proton radiation damage in P-channel CCDs fabricated on high-resistivity silicon
    • Article
    LBL Publications (1995)
      Cover page: Four Papers by the "Supernova Cosmology Project"
      • Article
      LBL Publications (1995)
        Cover page: Four Papers by the "Supernova Cosmology Project"Creative Commons 'BY' version 4.0 license
        • Article
        • Peer Reviewed
        UC Berkeley Previously Published Works (2002)
        SN 1999aw was discovered during the first campaign of the Nearby Galaxies Supernova Search project. This luminous, slow-declining [Δm 15(B) = 0.81 ± 0.03] Type Ia supernova was noteworthy in at least two respects. First, it occurred in an extremely low luminosity host galaxy that was not visible in the template images nor in initial subsequent deep imaging. Second, the photometric and spectral properties of this supernova indicate that it very likely was similar to the subclass of Type Ia supernovae whose prototype is SN 1999aa. This paper presents the BVRI and J SHKS light curves of SN 1999aw (through ∼100 days past maximum light), as well as several epochs of optical spectra. From these data, we calculate the bolometric light curve and give estimates of the luminosity at maximum light and the initial 56Ni mass. In addition, we present deep BVI images obtained recently with the Baade 6.5 m telescope at Las Campanas Observatory that reveal the remarkably low-luminosity host galaxy.
          Cover page: The Type Ia Supernova 1999aw: A Probable 1999aa-like Event in a Low-Luminosity Host Galaxy
          • Article
          Lawrence Berkeley National Laboratory (2002)
            Cover page: SNAP focal plane
            • Article
            Lawrence Berkeley National Laboratory (2002)
              Cover page: The SNAP near infrared detectors
              • Article
              Lawrence Berkeley National Laboratory (2003)

              The proposed SuperNova/Acceleration Probe (SNAP) mission will have a two-meter class telescope delivering diffraction-limited images to an instrumented 0.7 square degree field in the visible and near-infrared wavelength regime. The requirements for the instrument suite and the present configuration of the focal plane concept are presented. A two year R&D phase, largely supported by the Department of Energy, is just beginning. We describe the development activities that are taking place to advance our preparedness for mission proposal in the areas of detectors and electronics.

                Cover page: SNAP Satellite Focal Plane Development
                • Article
                LBL Publications (2003)
                A wide field space-based imaging telescope is necessary to fully exploit the technique of observing dark matter via weak gravitational lensing. This first paper in a three part series outlines the survey strategies and relevant instrumental parameters for such a mission. As a concrete example of hardware design, we consider the proposed Supernova/Acceleration Probe (SNAP). Using SNAP engineering models, we quantify the major contributions to this telescope's Point Spread Function (PSF). These PSF contributions are relevant to any similar wide field space telescope. We further show that the PSF of SNAP or a similar telescope will be smaller than current ground-based PSFs, and more isotropic and stable over time than the PSF of the Hubble Space Telescope. We outline survey strategies for two different regimes - a "wide" 300 square degree survey and a "deep" 15 square degree survey that will accomplish various weak lensing goals including statistical studies and dark matter mapping.
                  Cover page: Weak Lensing from Space I: Instrumentation and Survey Strategy
                  • Article
                  Lawrence Berkeley National Laboratory (2002)
                    Cover page: Overview of the SuperNova/Acceleration probe (SNAP)
                    • Article
                    Lawrence Berkeley National Laboratory (2002)
                      Cover page: SNAP telescope
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