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Very Large Array Observations of Candidate High-Mass Protostellar Objects at 7 Millimeters

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Guido Garay1, Luis F. Rodríguez2 and Itziar de Gregorio-Monsalvo3

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We present radio-continuum observations at 7 mm made using the Very Large Array toward three massive star-forming regions thought to be in very early stages of evolution, selected from the 2002 sample of Sridharan et al. Emission was detected toward all three sources (IRAS 18470-0044, IRAS 19217+1651, and IRAS 23151+5912). We find that in all cases the 7 mm emission corresponds to thermal emission from ionized gas. The regions of ionized gas associated with IRAS 19217+1651 and IRAS 23151+5912 are hypercompact, with diameters of 0.009 and 0.0006 pc and emission measures of 7.0 × 108 and 2.3 × 109 pc cm-6, respectively.


Keywords

H II regions; stars: early-type; stars: formation


Dates

Issue 3 (2007 September)

Received 2007 April 5, accepted for publication 2007 May 26

Published 2007 July 3



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