Title  Spatial Density Probe Comparison in Protostars and YSOs 
Pi     J. Mangum
Time   15 hrs

 1. Name: Spatial Density Probe Comparison in Protostars and YSOs
    Authors: J. Mangum, A. Wootten

 2. Science goal: Compare the spatial density derived from
    measurements of the molecular spectral line emission from the
    CS and H2CO molecules from a representative sample of protostars
    and YSOs.  Coupled with studies of the kinetic temperature
    structure within these sources, spatial densities over a range
    from 10^5 - 10^8 cm^(-3) can be derived.

3. Number of sources: 30

4. Coordinates: 

  4.1. 10 sources in Oph      (RA=16:30, DEC=-24)
       10 sources in Perseus  (RA=03,  DEC=+30)
       10 sources distributed over sky (RA=any, DEC=any visible)

  4.2. Moving target: no

  4.3. Time critical: no


5.  Spatial scales:

  5.1. Angular resolution: 0.5"
       
  5.2. Range of spatial scales/FOV: 30"

  5.3. Single dish: yes
 
  5.4. ACA: yes

  5.5. Subarrays: no
 

6. Frequencies:

  6.1. Receiver band: Band 6, Band 7

  6.2. Line: H2CO 3(13)-2(12), H2CO 5(15)-4(14), CS 5-4, CS 7-6
       Frequency: 211.2 GHz, 351.8 GHz, 244.9 GHz, 342.9 GHz

  6.3. Spectral resolution (km/s): 0.05 km/s
  
  6.4. Spectral coverage (km/s or GHz): 20 km/s    


7. Continuum flux density:

  7.1. Typical value: O.3 Jy

  7.2. Continuum peak value: 0.3 Jy

  7.3. Required continuum rms: 0.0002 K

  7.4. Dynamic range in image: 20


8. Line intensity:

  8.1. Typical value: 0.03 Jy

  8.2. Required rms per channel: 0.5 K
  
  8.3. Spectral dynamic range: 20


9. Polarization: no


10. Integration time per setting: 30 x 0.5 hrs 

11. Total integration time for program: 15 hr


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Review John Richer: see program 2.1.1.





--------------------------------------------------
Review v2.0:
 
init_5 = 2.1.5

1. Name: Spatial Density Probe Comparison in Protostars and YSOs
    Authors: J. Mangum, A. Wootten

Unchanged w.r.t. DRSP 1.1. 7m x 12m correlations may be useful to
increase sensitivity. To what extent will continuum-only measurements
already provide the density information? The combined interpretation
of SEDs and continuum visibilities has become quite powerful in recent
years. (I guess the answer is that this is an independent measure of
the volume density)