Proposal code 
 
w055  
 
 Proposal title 
  
Compact Sources in Kellerman et al. 2CM Sample: Young or Confined?  
 
  
 
     The   |  
     Investigators and their  |  
     Affiliations   |  
 
 
   |  P.I.   |  
    Glen Langston   |  
    NRAO, USA   |  
 
 
   |    |  
    Anthony Minter   |  
    NRAO, USA   |  
 
  
 Proposal Abstract 
  
The Kellerman  et al. 1998 2CM sample shows a remarkable  
variety of radio sources,  
but the most remarkable are those  without extended structure. 
Given the high angular resolution and dynamic range of the { 2 cm} sample, 
and since the redshifts are known, the physical sizes must be smaller  
than a few par-secs. 
These sources should be extended unless the components are confined 
and moving slowly (velocities  < 0.01 c), or are  young,  
age < 100 years.   
 
These observations at 6 cm with HALCA will better determine the angular size 
of the sources, by searching for steep spectrum emission, typical of 
jets, near the bright core.  For the marginally resolved sources, 
the spectral indices of the components will be determined. 
 
These observations are also important for tests of the HALCA mission  
performance. 
 
 
 
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