Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session X9: Dark Energy II |
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Sponsoring Units: DAP Chair: Mark Phillips, Las Campanas Observatory Room: Marriott Tampa Waterside Room 5 |
Tuesday, April 19, 2005 10:45AM - 10:57AM |
X9.00001: Cosmology with Supernovae Type Ia in Sloan Digital Sky Survey (SDSS) and Dark Energy Survey (DES) Juan Estrada The contributions to cosmology expected from SNIa samples that will be detected in the extension of SDSS and the proposed DES will be presented. The ability of SDSS to populate a region of intermediate redshift, where the current number of SNIa candidates is low, will be discussed together with the results of the SDSS 2004 SNIa test survey. The expected efficiency for SNIa detection in DES will be discussed, and its dependence on the near-IR quantum efficiency of the CCDs used in the DES camera will be presented. [Preview Abstract] |
Tuesday, April 19, 2005 10:57AM - 11:09AM |
X9.00002: Optics and Imaging for the Dark Energy Survey Camera. Vic Scarpine The Dark Energy Survey (DES) project is a next generation southern hemisphere sky survey utilizing the Blanco 4-meter telescope at CTIO. The survey science goals are to extract information about dark energy utilizing galaxy clustering, galaxy angular power spectra, weak lensing and type Ia supernovae. To accomplish this survey the DES collaboration will build a 500 megapixel camera with a 2.2 degree field of view at prime focus covering the g, r, i and z filter bands. Essential to this camera is the design of wide-field corrector optics that will provide adequate imaging to perform the science goals. Presented are the corrector optical design and the imaging performance of the DES camera with respect to the science goals. [Preview Abstract] |
Tuesday, April 19, 2005 11:09AM - 11:21AM |
X9.00003: Cosmology with the Dark Energy Survey Douglas Tucker The Dark Energy Survey (DES) is a 5000 sq. deg. griz imaging survey to be conducted using a proposed 3 sq. deg. wide-field mosaic camera on the CTIO Blanco 4m telescope. The primary scientific goal of the DES is to constrain dark energy cosmological parameters via 4 complementary methods: galaxy clusters, weak lensing, galaxy angular correlations, and Type Ia supernovae, supported by precision photometric redshifts. Individually these will probe w at the 5-15{\%} level; collectively they can in principle reach the few percent level. The DES is the next step in precision measurements of dark energy. [Preview Abstract] |
Tuesday, April 19, 2005 11:21AM - 11:33AM |
X9.00004: Overview of the SuperNova/Acceleration Probe(SNAP) Science Program William Carithers The principal goal of the SNAP mission is a precise determination of the dark energy equation of state and its time derivative. To achieve this goal, SNAP will observe over 2000 well-measured Type Ia supernovae, and carry out a weak-lensing survey of approximately 1000 square degrees with particular attention to the control of systematic errors. In addition, the combination of unprecedented width and depth of the surveys in nine filters will enable a wide variety of other astrophysical science. This talk will present an overview of the SNAP science program. [Preview Abstract] |
Tuesday, April 19, 2005 11:33AM - 11:45AM |
X9.00005: The SNAP Instrument Suite Natalie Roe The SuperNova Acceleration Probe (SNAP) is a dedicated space-based mission designed to study dark energy using supernovae and gravitational weak lensing. SNAP has a 2-meter telescope, a large focal plane with sensitivity in the visible to near-infrared and a dedicated spectrograph. An active program of R&D is underway on all aspects of the mission design. In this talk, an overview of the SNAP instrument suite will be presented, with a focus on recent developments in sensors and electronics that may also have broader applications. [Preview Abstract] |
Tuesday, April 19, 2005 11:45AM - 11:57AM |
X9.00006: Possible Approaches to Measuring the Distance-Redshift Relation via Gravitational Lensing Paul Stankus The primary evidence for an accelerating Universe, currently, is found in the departure from the Hubble relation for distance vs redshift as measured in distant supernovae. These methods rely on knowing the intrinsic luminosities of ancient supernovae, and while there is no reason to doubt them it is clearly desirable to have alternate measurements of the distance-redshift relation which do not involve luminosities. Gravitational lensing of distant galaxies may afford such a measurement. Outlines for two possible approaches are described: (1) Strong lensing of CMB anisotropies in coincidence with strong lensing of a distant galaxy; (2) Statistical correlation of weak lensing signatures with redshift. Feasibility using current and future instruments are briefly discussed. [Preview Abstract] |
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