W3(OH)

https://www.nrao.edu/archives/plugins/Dropbox/files/W3-OH_VR17_hi.jpg

Description

W3(OH) is a very bright, compact HII region within the W3 complex. This knot is coincident with the OH masers and has an optically thick spectrum below 15 GHz. This object is a shell that is becoming optically thin between 15 and 23 GHz. At a distance of 3 kpc, the radius of the shell is about 0,007 pc (1400 AU); if it is freely expanding at 10 km/s, then the expansion phase must be only about 800 years old. The outer diameter of the shell is 1.4 arcsec.

Creator

Legacy Astronomical Images

Rights

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Type

Legacy Astronomical Image

Object Name

W3

Investigators

J.W. Dreher, W.J. Welch

Telescope

Very Large Array (VLA)

Observation Date

1979-02-09

Type of Observation

continuum

Band

U

Wavelength

2.0 cm

Frequency

15 GHz

Center of Image

RA 2:27:3.900, Dec: 61:52:25.000 (J2000)

Field of View

0.001111 x 0.001111 degrees

Notes

Contact the archivist for a high resolution tif of this image.

Series

Galactic Sources Series

Unit

Star Forming Regions Unit

Citation

Legacy Astronomical Images, “W3(OH),” NRAO Archives, accessed December 3, 2021, https://www.nrao.edu/archives/items/show/33495.