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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29082
Title: Nitrogen fractionation in external galaxies
Authors: VITI, SERENA 
FONTANI, FRANCESCO 
Jiménez-Serra, Izaskun
Holdship, Jonathan
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 486
Issue: 4
First Page: 4805
Abstract: In star-forming regions in our own Galaxy, the <SUP>14</SUP>N/<SUP>15</SUP>N ratio is found to vary from ∼100 in meteorites, comets, and protoplanetary discs up to ∼1000 in pre-stellar and star-forming cores, while in external galaxies the very few single-dish large-scale measurements of this ratio lead to values of 100-450. The extent of the contribution of isotopic fractionation to these variations is, to date, unknown. In this paper, we present a theoretical chemical study of nitrogen fractionation in external galaxies in order to determine the physical conditions that may lead to a spread of the <SUP>14</SUP>N/<SUP>15</SUP>N ratio from the solar value of ∼440 and hence evaluate the contribution of chemical reactions in the interstellar medium (ISM) to nitrogen fractionation. We find that the main cause of ISM enrichment of nitrogen fractionation is high gas densities, aided by high fluxes of cosmic rays.
URI: http://hdl.handle.net/20.500.12386/29082
URL: https://academic.oup.com/mnras/article-abstract/486/4/4805/5482092
ISSN: 0035-8711
DOI: 10.1093/mnras/stz1172
Bibcode ADS: 2019MNRAS.486.4805V
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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