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The rms noise can be computed from
|
(1) |
where
- is the conversion factor from Kelvin to Jansky (22
Jy/K at 3mm, 35 Jy/K at 1.3mm)
- is the system temperature ( = 100K
below 110GHz, 180K at 115GHz, 250K at 230GHz for sources at
and for typical summer conditions.)
- is an efficiency factor due to atmospheric phase noise
(0.9 at 3mm, 0.8 at 1.3mm).
- is the number of antennas (5), and
is the number of
configurations: 1 for D, 2 for CD, and so on.
- is the on-source integration time per configuration
in seconds (2 to 8 hours, depending on source declination). Because of
various calibration observations the total observing time is typically
1.4 .
- is the spectral bandwidth in Hz (up to 2 GHz for continuum,
40 kHz to 2.5 MHz for spectral line, according to the spectral correlator
setup)
- is the number of polarizations: 1 for single polarization
and 2 for dual polarization (see section Correlator for details).
Investigators have to specify the one sigma noise level which is
necessary to achieve each individual goal of a proposal, and
particularly for projects aiming at deep integrations.
Next: Coordinates and Velocities
Up: Call for Observing Proposals
Previous: Receivers
Clemens Thum
2007-02-14