Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..180j&link_type=abstract
The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb
Physics
2
Scientific paper
The Orion molecular clouds contain the nearest site of on-going high and low-mass star formation. The ``Integral Shaped Filament", a dense ridge of molecular gas within the Orion A cloud, contains about 10^4 M odot and has an average molecular hydrogen density of n(H _2) = 10 ^4 to 10 ^5 cm ^{-3}. We present the first high dynamic range and sensitivity images of the sub-millimeter wavelength continuum emission at 450microns and 850microns. The maps mostly trace optically thin emission from interstellar dust and constrain the dust temperature and grain properties of the region. The images reveal a narrow high column density filament that extends over the 50 arcmin length of the map with faint extended structure surrounding it. The main filament contains tens of compact sources, some of which may be extremely young protostars or even pre-collapse phase cloud cores. A remarkable set of dust filaments radiate away from the main Orion OMC 1 core and coincide with filaments of molecular emission. Photo-heated edges of the molecular cloud are also visible in the maps as are regions with an anomalously low ratio of 450microns to 850microns brightness, coincident with known Herbig-Haro shocks. This paper touches on issues which are discussed in detail in Johnstone & Bally (1999).
Bally John
Johnstone Doug
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