High resolution far-infrared observations of the evolved H II region M16
M16 is an evolved, extremely density bounded H II region, which now consists only of a series of ionization fronts at molecular cloud boundaries. The source of ionization is the OB star cluster (NGC 6611) which is about 5 x 10/sup 6/ years old. We used the CFA/UA 102 cm balloon-borne telescope to map this region and detected three far-infrared (far-IR) sources embedded in an extended ridge of emission. Source I is an unresolved far-IR source embedded in a molecular cloud near a sharp ionization front. An H/sub 2/O maser is associated with this source, but no radio continuum emission has been observed. The other two far-IR sources (II and III) are associated with ionized gas-molecular cloud interfaces, with the far-IR radiation arising from dust at the boundary heated by the OB cluster. Source II is located at the southern prominent neutral intrusion with its associated bright rims and dark ''elephant trunk'' globules that delineate the current progress of the ionization front into the neutral material, and Source III arises at the interface of the northern molecular cloud fragment.
- Research Organization:
- Harvard-Smithsonian Center for Astrophysics
- OSTI ID:
- 5289685
- Journal Information:
- Astrophys. J.; (United States), Vol. 254:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
H2 REGIONS
INFRARED SPECTRA
COSMIC DUST
COSMIC GASES
FAR INFRARED RADIATION
IONIZATION
MASERS
NEBULAE
STAR CLUSTERS
AMPLIFIERS
COSMIC RADIO SOURCES
DUSTS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUIDS
GASES
INFRARED RADIATION
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
RADIATIONS
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies