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High-resolution observations of the Orion bright bar
Authors:Omodaka  Toshihiro  Hayashi  Masahiko  Suzuki  Saeko  Hasegawa  Tetsuo  Miyawaki  Ryosuke
Institution:(1) College of Liberal Arts, Kagoshima University, Japan;(2) Department of Astronomy, University of Tokyo, Japan;(3) Nobeyama Radio Observatory, Tokyo Astronomical Observatory, University of Tokyo, Japan;(4) Hachioji Technical High School, Hachioji, Japan
Abstract:High resolution strip maps of CS (J=1–0) and H51agr line emission across the Orion bright bar are presented. They reveal the existence of a high density molecular layer (molecular sheet) plane parallel to the ionization front. This molecular sheet is redshifted relative to the ambient molecular cloud by about 2 km s–1. The rapid decrease of the CS emission at about 50 arc sec from the bar suggests that a shock front exists here and the sheet is a post shock layer.Paper presented at the IAU Third Asian-Pacific Regional Meeting, held in Kyoto, Japan, between 30 September–6 October, 1984.This work was carried out under the common use observation program at the Nobeyama Radio Observatory (NRO). NRO, a branch of the Tokyo Astronomical Observatory, University of Tokyo, Japan, is a cosmic radio observing facility open to outside users.
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