Title  Mapping the turbulence in a molecular cloud
Pi     J. Richer
Time   121 hrs

 1. Name: Mapping the turbulence in a molecular cloud

    Authors: J Richer

 2. Science goal: To image at 2 arcsec resolution a nearby quiescent
    molecular cloud containing full spatial information up to the
    diffraction limit. Aim is to compare quantitatively with numerical
    models of turbulence in molecular clouds, in particular looking for
    filaments and shock strcutures, and the fluid flow within these.
    Various quantitative diagnostics will be used to compare with models
    (delta variance, wavelets techniques, power spectra).  I have chosen
    the C18O 1-0 line as gas tracer.  The observation will produce a
    6000x6000 pixel data cube, with perhaps 40 or so spectral channel
    containing emission.

    Tis survey will also produce serendipitous sources - it has an rms
    of 12 micro Jy at 110GHz.

3. Number of sources: 1

4. Coordinates: 

  4.1. Somewhere in Ophiuchus would do, say RA=16:30, DEC=-24

  4.2. Moving target: no

  4.3. Time critical: no

5.  Spatial scales:

  5.1. Angular resolution: 2.0 arcsec
       
  5.2. Range of spatial scales/FOV: 10 arcmin

  5.3. Single dish: yes
 
  5.4. ACA: possibly, perhaps not essential

  5.5. Subarrays: no
 
6. Frequencies:

  6.1. Receiver band: Band 3

  6.2. Line: C18O 1-0
       Frequency: 110 GHz

  6.3. Spectral resolution (km/s): 0.1 km/s
  
  6.4. Spectral coverage (km/s or GHz): 5 km/s    


7. Continuum flux density:

  7.1. Typical value: 10 mJy but irrelevant

  7.2. Continuum peak value: 40 mJy

  7.3. Required continuum rms: 12 micro Jy achieved (0.3mK)

  7.4. Dynamic range in image:


8. Line intensity:

  8.1. Typical value: 2 K

  8.2. Required rms per channel: 0.15 K
  
  8.3. Spectral dynamic range: 15

9. Polarization: no

10. Integration time: 

    Mosaic size is 22x22 fields to cover 10x10 arcmin = 484 fields
    (assuming sampling at 27 arcsec, half the primary beam size at 110
    GHz)

    Time required per field is 900 seconds to get to delta T = 0.15 K

11. Total integration time for program: 121 hrs

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Review Munetake Momose: OK

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Review v2.0:
 
yso_1 = 2.2.1

 1. Name: Mapping the turbulence in a molecular cloud

    Authors: J Richer

Unchanged w.r.t. DRSP 1.1. Now this is a project where ACA is
essential I would think and perhaps even getting the correlations
between the 7m and 12m antennas. Some careful modeling of the response
of the actual (u,v) sampling with a cloud structure may be required to
settle on the optimal observational strategy. Consider multifrequency
imaging for the continuum to increase the spatial sampling?