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Table 1

Radiative background and photon noise from instrument, atmosphere, and astrophysical background in several sub-bands suitable for SZE measurements.


Band Background Noise in 1s
(GHz) (pW) (fW/GHz)

85110 40 55
125175 110 110

Stratospheric balloon

Band Background Noise in 1s
(GHz) (pW) (fW/GHz)

125175 80 90
190260 110 130
280360 110 160
390420 40 100


Band Background Noise in 1s
(GHz) (pW) (fW/GHz)

100180 7 30
180350 10 50
350700 16 80
7001000 7 70

Notes. Photon noise per spectral bin is computed assuming that noise from all the frequencies within the sub-band is contributing to the measurement of the considered bin. Top: room-temperature spectrometer on a ground-based telescope (1 mm PWV). Middle: room-temperature spectrometer on a stratospheric balloon. Bottom: cold (2 K) spectrometer on a satellite. All instruments are diffraction limited at the lowest end of each sub-band. Turbulence and atmospheric fluctuations, which can be relevant in the groud-based case, are not included.

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