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U 波段巡天的天区覆盖及优化策略 PowerPoint Presentation
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U 波段巡天的天区覆盖及优化策略 - PowerPoint PPT Presentation

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U 波段巡天的天区覆盖及优化策略
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  1. U波段巡天的天区覆盖及优化策略 沈世银

  2. 巡天天区 • b>30, Dec>-10: 3700 degree • SDSS III:南银冠天区巡完了3100平方度的天区。数据将于2010年底释放;

  3. 4K x 4K CCD • 1.0x 1.0 degree • 0.45"/pixelm(30.2"/mm ) • Single CCD • 30 x 30 arcmin • Gap: • 2.8 x 1.0 acrmin

  4. 四次平移可完整覆盖1.5x1.5deg^2

  5. 4次观测完整覆盖总天区:1.5x1.5deg^2 • 1次观测天区:1deg^2 • 2次观测天区:1deg^2 • 3次观测天区:0.25 deg^2 • 4次观测CCD覆盖视场4deg^2 • 利用率56% (for flux calibration) • 4次观测: 0.5h? • 3700deg^2: 800h – 80day ?

  6. 最优覆盖策略?F=(3W+G)2/16W2 极端情况 W = G , F=1 W G

  7. 巡天战略 • 1.5x1.5 deg2为单元 • 整体巡天战略 • 没有 pan-star 数据, 优先SDSS 已观测天区(3 strips) • What science with deeper U band data • 有 pan-star 数据,优先非SDSS天区