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ETC Block Diagram

ETC Block Diagram. Spectra Type Stellar (50 stellar types) Galaxies (elliptical, spiral) QSO Luminosity Profile point source extended (uniform, gaussian, elliptical, exponential) Redshift. Source Spectrum is derived from:. Sky Background Spectrum based on specified observing parameters.

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ETC Block Diagram

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  1. ETC Block Diagram

  2. Spectra Type Stellar (50 stellar types) Galaxies (elliptical, spiral) QSO Luminosity Profile point source extended (uniform, gaussian, elliptical, exponential) Redshift Source Spectrum is derived from:

  3. Sky Background Spectrum based on specified observing parameters • Lunar Phase • Moon-target separation • Airmass • Solar cycle (min, max, average)

  4. System Throughput derived from LSST system specifications • Telescope Aperture • Optics (Lenses and Mirrors) • Filter Transmission – U G R I Z Y • Detector Sensitivity

  5. Atmospheric TransmissionModel • Base Sky Transmission Curve • Clouds • Humidity • Airmass

  6. Signal-to-noise Analysis • Select optimal aperture • Sum weighted source count • Sum weighted sky background count • Add sources of noise: • Poisson noise (source and background) • Sky Estimation Noise • Readout Noise • Dark Current Noise

  7. Weighted source noise Weighted background noise Dark current noise Readout noise Sky subtraction noise Poisson Poisson 0.0015 e-/s/pixel 5 e-/pixel 1/sky aperture Sources of Noise

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