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Session 108 - HII Regions.
Display session, Thursday, January 18
North Banquet Hall, Convention Center
Many HII Regions are illuminated blisters flowing off the face of a background molecular cloud. The observed spectrum is a combination of radiation which escapes from the HII region in the direction towards the observer, and a second spectrum reflected from the molecular cloud. The reflection efficiency of the molecular cloud ranges from a low near zero in the far infrared, where the effective grain albedo is near zero, to a high near 30% at ultraviolet wavelengths. Consideration of this reflection component is very important when observations over a broad wavelength range are considered. We outline a method where the presence of this reflection component can be directly taken into account when de-reddening broad band observations.
Supported by AURA/STScI grants related to GO-4385 amp; GO-6056.
Program listing for Thursday