description RCW 139 Overview
RCW 139 is an astronomical nebula also identified as Sh2-18, an H II region in the constellation Sagittarius. H II regions are clouds of ionized hydrogen associated with the formation of young stars. RCW 139 is also associated with masers, compact sources of stimulated microwave emission that can trace energetic processes in active star-forming environments.
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What is RCW 139 also called?
RCW 139 is also identified as Sh2-18. Both designations refer to the nebula in Sagittarius described here as an H II region.
Where is RCW 139?
RCW 139 lies in the constellation Sagittarius. The object is an astronomical nebula rather than a terrestrial cloud.
What kind of nebula is RCW 139?
It is an H II region, a cloud of ionized hydrogen associated with young-star formation. Its glow comes from gas energized by nearby hot, young stars.
Why are masers associated with RCW 139 important?
Masers are compact sources of stimulated microwave emission found in some star-forming environments. Their association with RCW 139 makes the object useful for studying dense, active regions around young stars.
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