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CCAT Sensitivities

CCAT Sensitivities. Last Update: 12-May-05. TLH. Table 1: CCAT Baseline Sensitivity.

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CCAT Sensitivities

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  1. CCAT Sensitivities Last Update: 12-May-05 TLH

  2. Table 1: CCAT Baseline Sensitivity Sensitivity selected on the basis of appropriate PWV for that wavelength. NEFD is 1-sigma in 1 second. Confusion limit (CL) is for 30 beams/source. Time to CL is for S/N = 5. Source density is for all sources  CL flux.

  3. Table 2: CCAT Sensitivity vs. PWV Bold numbers are the baseline sensitivity for CCAT. Assumptions: 30 deg from zenith, 12 mm surface rms, chopping/difference loss of 1.414, 5000m altitude for transmission calculations (but consistent with tau(222 mm) measurements from Sairecabur). PWV varies from 0.125 to 2.0 mm.

  4. Table 3: CCAT Confusion Limits From Andrew Blain, 3/28/05. Updated to be consistent with beam size definition used in sensitivity calculation.

  5. Figure 1: CCAT Sensitivity Confusion limits for Spitzer, Herschel, APEX, JCMT, and LMT are shown.

  6. Figure 2: CCAT Sensitivity Confusion limits for Spitzer, Herschel, APEX, JCMT, and LMT are shown.

  7. Figure 3: Mapping Speed Mapping speed (Field-of-view*NEFD-2) of CCAT vs. ALMA. Assumes 12-m dish for ALMA and 150x150 array sampled at 2-pixels/resolution element for a 25-m CCAT. The table at right represents the speed gain for CCAT over ALMA (ratio of the mapping speeds).

  8. Figure 4: NEFD vs. PWV Changing in CCAT sensitivity vs. precipitable water vapor for different operating wavelengths. NEFD is the flux density for 1-sigma in 1 second.

  9. Figure 5: Performance vs. Surface RMS Changing in CCAT sensitivity vs. total rms surface accuracy for different operating wavelengths. NEFD is the flux density for 1-sigma in 1 second.

  10. Figure 6: Atmospheric Transmission Atmospheric transmission for different amounts of precipitable water vapor. The horizontal red bars represent the adopted bandpasses and the average transmission for 0.25 mm PWV.

  11. Table 4: CCAT Line Sensitivity R = 1000 spectroscopic sensitivity for CCAT. Numbers are for 1-sigma in 1-second. Sensitivity selected on the basis of appropriate PWV for that wavelength. Note: these numbers are for a non-heterodyne spectrograph.

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