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ALMA-IRDC - II. Fir...
ALMA-IRDC - II. First high-angular resolution measurements of the N-14/N-15 ratio in a large sample of infrared-dark cloud cores
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- Fontani, F. (author)
- Istituto nazionale di astrofisica (INAF),Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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- Barnes, A. T. (author)
- Universität Bonn,University of Bonn
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- Caselli, P. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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- Henshaw, J. D. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Cosentino, Giuliana, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Jimenez-Serra, I (author)
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- Tan, Jonathan, 1973 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Pineda, J. E. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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- Law, Chi Yan, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2021-03-22
- 2021
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 503:3, s. 4320-4335
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Abstract
Subject headings
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- The N-14/N-15 ratio in molecules exhibits a large variation in star-forming regions, especially when measured from N2H+ isotopologues. However, there are only a few studies performed at high-angular resolution. We present the first interferometric survey of the N-14/N-15 ratio in N2H+ obtained with Atacama Large Millimeter Array observations towards four infrared-dark clouds harbouring 3 mm continuum cores associated with different physical properties. We detect (NNH+)-N-15 (1-0) in of the cores, depending on the host cloud. The N-14/N-15 values measured towards the millimetre continuum cores range from a minimum of similar to 80 up to a maximum of similar to 400. The spread of values is narrower than that found in any previous single-dish survey of high-mass star-forming regions and than that obtained using the total power data only. This suggests that the N-14/N-15 ratio is on average higher in the diffuse gaseous envelope of the cores and stresses the need for high-angular resolution maps to measure correctly the N-14/N-15 ratio in dense cores embedded in IRDCs. The average N-14/N-15 ratio of similar to 210 is also lower than the interstellar value at the Galactocentric distance of the clouds (similar to 300-330), although the sensitivity of our observations does not allow us to unveil N-14/N-15 ratios higher than similar to 400. No clear trend is found between the N-14/N-15 ratio and the core physical properties. We find only a tentative positive trend between N-14/N-15 and H-2 column density. However, firmer conclusions can be drawn only with higher sensitivity measurements.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- stars: formation
- ISM: clouds
- ISM: molecules
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Fontani, F.
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Barnes, A. T.
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Caselli, P.
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Henshaw, J. D.
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Cosentino, Giuli ...
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Jimenez-Serra, I
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show more...
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Tan, Jonathan, 1 ...
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Pineda, J. E.
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Law, Chi Yan, 19 ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Monthly Notices ...
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Chalmers University of Technology