DR 21 (W 75 S)

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About this Image

Region of recent star formation in our Galaxy: continuum emission at 2 cm from the thermal radio source DR 21 observed at a resolution of 2 arcsec. The intesnsity is color-coded from blue (> 50 to 200 mJy/beam) to red (> 400 to a maximum of 600 mJy/beam). DR 21 is comprised of four ultracompact HII regions, each of which is excited by a recently-formed hot O or B star. The most intense HII region C (bottom) is about 10 arcsec across or 0.3 light-years (at a distance of 6000 light-years).

Investigator(s):  H.R. Dickel, A.F. Lubenow, W.M. Goss, and A.H. Rots

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Technical Data

    Telescope VLA 
    Date of Observation 1983-05-16 
    Type of Observation Continuum Observations 
    Band U 
    Wavelength 2.0 cm 
    Frequency 15 GHz 
    Center of Image RA: 20:37:14.30, Dec: 42:09:3.00 (B1950)  
    Field of View 0.0167 x 0.0167 degrees  
    Technical Caption Observing run - 1983 May 14 & 16 at the VLA in the C-configuration using 17 antennas. Type of observation - spectral line mapping.  

  • Astronomical database entries for DR21
    • Query SIMBAD for more DR21 data


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