The rms brightness temperature is related to the point source sensitivity
by
![]() |
(2) |
For a typical experiment with configuration BC or CD, tracking the source
for 8 hours (but spending 2 hours on calibration) on each configuration, we
obtain = 0.11 K and
= 0.03 K, for 0.625 MHz
channel spacing with the spectral correlator, with the same assumptions as
above at 90 GHz. The factor
is increased by uniform weighting and
tapering: the amount depends on the uv-coverage and on the phase noise as
a function of baseline lengths (1 to 3), but tapering also increases the
synthesized beam size.
An equivalent way to look at noise in a map is by comparison to the
single-dish sensitivity (given here for position switching)
![]() |
(3) |
The mapping sensitivity is roughly related to by
![]() |
(4) |