Noise

Noise is specified for a given band

band_with_noise = Band(center=150,
                       width=30,
                       sensitivity=5e-5,
                       knee=1e0,
                       gain_error=5e-2)

We can also use the

band_with_noise = Band(center=150,
                       width=30,
                       sensitivity=5e-5,
                       knee=1e0,
                       gain_error=5e-2)

Note that any sensitivity units are only implicit due to the imperfect efficiency (caused by the instrument and the atmosphere). For a heuristic, the band implicitly assumes that we are observing the zenith at the ALMA site with a PWV of 1mm, and converts the given sensitivity to the corresponding noise equivalent power. We can customize this by setting the sensitivity as

my_band.set_sensitivity(1e-5, pwv=2, elevation=45, region="mauna_kea")