Re: [alma-sw-ssr] Pipeline Requirements new version

[Robert Lucas <lucas@iram.fr>]

mel wright 456 wrote:

> Robert,
>         you can check my numbers (maybe wrong ?)
> 
>  obsrms freq=40 antdiam=12 tsys=40 nants=60 bw=8000 inttime=.1 min
> => Rms Flux density:   0.142     mJy/beam in 6s.
> 
> Kellerman gives  N(S) = 60 S^{-1.5} Sr^{-1}
> [at 5 GHz (?); I think Frazer had some better estimates at mm]
> 
> calc '60/.7e-3**1.5*2.1*2.1/3400/3400'
> =>  1.2 sources in a 2.1' beam above  5 x RMS in 6s.
> 
Mel:

I think you're using the sensitivity for detecting a point source, while
you should use the sensitivity for getting the phase for each antenna
which is sqrt(60)~8 times  worse.

Robert



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Robert LUCAS,            Institut de Radioastronomie Millimetrique
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