Deuteration of ammonia in the starless core Ophiuchus/H-MM1
نویسندگان
چکیده
منابع مشابه
An Accreting Starless Core
We have mapped the starless core TMC-1C in a variety of molecular lines with the IRAM 30m telescope. High density tracers show clear signs of self-absorption and sub-sonic infall asymmetries are present in N 2 H + (1–0) and DCO + (2–1) lines. The inward velocity profile in N 2 H + (1–0) is extended over a region of about 7,000 AU in radius around the dust continuum peak, which is the most exten...
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We present combined single-dish and interferometric CS(2–1) and N2H (1– 0) observations of a compact core in the NW region of the Serpens molecular cloud. The core is starless according to observations from optical to millimeter wavelengths and its lines have turbulent widths and “infall asymmetry”. Line profile modeling indicates supersonic inward motions vin ∼> 0.34 km s −1 over an extended r...
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Dense, small molecular cloud cores have been identified as the direct progenitors of stars. One of the best studied examples is Barnard 68 which is considered a prototype stable, spherical gas core, confined by a diffuse high-pressure environment. Observations of its radial density structure however indicate that Barnard 68 should be gravitationally unstable and collapsing which appears to be i...
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We have studied the physical and chemical properties of a quiescent starless core L1521E with various molecular lines. It is found that there exists a compact dense core traced by the HCO, HNC, CCS, and HC3N lines; their distributions have a single peak at the same position. The core radius is as small as 0.031 pc, whereas the H2 density at the peak position is as high as (1.3-5.6)×105 cm−3. Al...
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New molecular line observations of the Bok globule Barnard 68 in HCO + irrefutably confirm the complex pattern of red and blue asymmetric line profiles seen across the face of the cloud in previous observations of CS. The new observations thus strengthen the previous interpretation that Barnard 68 is undergoing peculiar oscillations. Furthermore, the physical chemistry of B68 indicates that the...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2017
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201628463