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Confusion. Confusion limit for 42m 850μm450μm350μm200μm 5σ/40beam confusion limit * (90% sky coverage) 0.5 mJy0.2 mJy0.1 mJy0.02 mJy Time to confusion.

Published byNathan Burke Modified over 11 years ago

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Presentation on theme: "Confusion. Confusion limit for 42m 850μm450μm350μm200μm 5σ/40beam confusion limit * (90% sky coverage) 0.5 mJy0.2 mJy0.1 mJy0.02 mJy Time to confusion."— Presentation transcript:

1 Confusion

2 Confusion limit for 42m 850μm450μm350μm200μm 5σ/40beam confusion limit * (90% sky coverage) 0.5 mJy0.2 mJy0.1 mJy0.02 mJy Time to confusion limit (for point source) 5 minutes2 hours30 hours1000 days * For 5x5 arcmin imager => 400 objects in the FOV

3 THz windows 1mm pwv (band 1-2) 0.2mm pwv 450 350 230 200 um

4 APEX site

5 PWV content (mm) Optical depth at zenith at 225GHz NEFD 850μm NEFD 450μm NEFD 350μm NEFD 200μm 0.2mmτ 225 =0.021.62.44.0~10 0.5mmτ 225 =0.031.83.86.440-100 1mmτ 225 =0.062.07.914>> 2mmτ 225 =0.12.83568>> 4mmτ 225 =0.195.17001600>>

6 Sub-mm colour ratios 200 350 450 850um T=10, 20, 40K 200/450 350/450 450/850

7 Calibration WavelengthsCalibration accuracy Temperature range 850/450um5/10%2-24K 450/350um10%2-7K 450/200um10/25%10-27K

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