APEX observations of ortho-H2D+ towards dense cores in the Orion B9 filament
نویسندگان
چکیده
منابع مشابه
Prestellar and protostellar cores in Ori B 9 ⋆
Context. Dense molecular cores are studied in order to gain insight into the processes causing clouds to fragment and form stars. In this study we concentrate on a region which is assumed to represent an early stage of clustered star formation in a giant molecular cloud. Aims. The aims of this study are to determine the properties and spatial distribution of dense cores in the relatively quiesc...
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The Trifid nebula is a young HII region undergoing a burst of star formation. In this article, we report on far-infrared and millimeter continuum and line observations of several massive and bright protostellar sources in the vicinity of the exciting star of the nebula, just behind the ionization front. These objects are probably young protostars (Class 0) and are associated with very massive c...
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Aims. We report a detailed attempt to model the ortho-to-para abundance ratio of c-C3H2 so as to reproduce observed values in the cores of the well-known source TMC-1. According to observations, the ortho-to-para ratios vary, within large uncertainties, from a low of near unity to a high of approximately three depending on the core. Methods. We used the osu.2003 network of gas-phase chemical re...
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To study the evolution of high-mass cores, we have searched for evidence of collapse motions in a large sample of starless cores in the Orion molecular cloud. We used the Caltech Submillimeter Observatory telescope to obtain spectra of the optically thin (HCO ) and optically thick (HCO ) high-density tracer molecules in 27 cores with masses 11 M . The redand blue-asymmetries seen in the line pr...
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The interstellar medium is highly dynamic and turbulent. However, little or no attention has been paid in the literature to the implications that this fact has on the validity of at least six common assumptions on the virial theorem (VT), which are as follows. (i) The only role of turbulent motions within a cloud is to provide support against collapse; (ii) the surface terms are negligible comp...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2020
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201936730