NRAO: National Radio Astronomy Observatory

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

Alternate Resolutions

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If you would like to obtain a higher resolution version of this image, please contact Pat Smiley.

For More Information

• Up one level for more info on Star_Forming_Regions
• For unfamiliar terms, visit the NRAO Radio Astronomy Glossary

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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