First Look at Orion-KL with FIFI-LS onboard SOFIA
Abstract
As the closest region of high-mass star formation the Kleinmann-Low (KL) Nebula in Orion has been well studied. The young massive Trapezium cluster emits copious UV radiation that created a blister HII region bounded by the molecular cloud. In addition, this radiation creates a photon-dominated region (PDR) that includes the well-known Orion Bar. As our nearest region of massive star formation and as a bright and interesting region by itself, every new instrument will always observe Orion. It is our prototype region with which we can compare to other star forming regions farther away where limited spatial resolution requires more assumptions about morphology and use as a template when observing star forming regions in galaxies. In this presentation, we present the first look at the the Orion-KL region in the far-infrared obtained with the Far Infrared Field Imaging-Line Spectrometer (FIFI-LS) instrument onboard SOFIA. We observe six fine structure lines and several CO high-J transitions to illustrate the mapping ability of FIFI-LS and to probe the physical conditions in the Orion-KL region. We present large maps in these transitions of the the Orion Nebula. We used the ratio of the two [OIII] lines at 52 and 88 μm to map the electron density over the HII region. It ranges from 103 to 104 cm-3. We can also present first results of the analysis of the PDR cooling lines and and molecular lines leading to maps of physical conditions
- Publication:
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American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23315604M