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ALMA-IRDC - II. Fir...
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Fontani, F.Istituto nazionale di astrofisica (INAF),Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
(author)
ALMA-IRDC - II. First high-angular resolution measurements of the N-14/N-15 ratio in a large sample of infrared-dark cloud cores
- Article/chapterEnglish2021
Publisher, publication year, extent ...
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2021-03-22
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Oxford University Press (OUP),2021
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LIBRIS-ID:oai:research.chalmers.se:7bc7ea6b-af7c-4f8a-9c0c-e4af5da0815b
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https://research.chalmers.se/publication/524396URI
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https://doi.org/10.1093/mnras/stab700DOI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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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.
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Barnes, A. T.Universität Bonn,University of Bonn
(author)
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Caselli, P.Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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Henshaw, J. D.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,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)giuliana
(author)
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Jimenez-Serra, I
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Tan, Jonathan,1973Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tanj
(author)
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Pineda, J. E.Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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Law, Chi Yan,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ychi
(author)
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Istituto nazionale di astrofisica (INAF)Max-Planck-Institut für extraterrestrische Physik
(creator_code:org_t)
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In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)503:3, s. 4320-43350035-87111365-2966
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