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  Cosmological evolution of the Nitrogen abundance

Vangioni, E., Dvorkin, I., Olive, K. A., Dubois, Y., Molaro, P., Petitjean, P., et al. (2018). Cosmological evolution of the Nitrogen abundance. Monthly Notices of the Royal Astronomical Society, 477, 56-66. doi:10.1093/mnras/sty559.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7397-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-020A-0
Genre: Journal Article

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 Creators:
Vangioni, Elisabeth, Author
Dvorkin, Irina1, Author              
Olive, Keith A., Author
Dubois, Yohan, Author
Molaro, Paolo, Author
Petitjean, Patrick, Author
Silk, Joe, Author
Kimm, Taysun, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: Astrophysics, Galaxy Astrophysics, astro-ph.GA,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: The abundance of nitrogen in the interstellar medium is a powerful probe of star for- mation processes over cosmological timescales. Since nitrogen can be produced both in massive and intermediate-mass stars with metallicity-dependent yields, its evolution is challenging to model, as evidenced by the differences between theoretical predictions and observations. In this work we attempt to identify the sources of these discrepancies using a cosmic evolution model. To further complicate matters, there is considerable dispersion in the abundances from observations of DLAs at redshift 2 - 3. We study the evolution of nitrogen with a detailed chemical evolution model and find good agreement with observations, including the relative abundances of N/O and N/Si ratios. We find that the principal contribution of nitrogen comes from intermediate mass stars, with the exception of systems with the lowest N/H, where nitrogen production might possibly be dominated by massive stars. This last result could be strengthened if stellar rotation which is important at low metallicity can produce significant amounts of nitrogen. Moreover, these systems likely reside in host galaxies with stellar masses below 10**8.5 solar mass. We also study the origin of the observed dispersion in nitrogen abundances using the cosmological hydrodynamical simulations Horizon-AGN. We conclude that this dispersion can originate from two effects: differ- ence in the masses of the DLA host galaxies, and difference in the their position inside the galaxy.

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 Dates: 2017-10-272018-02-262018
 Publication Status: Published in print
 Pages: accepted for publication in MNRAS
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1710.10075
DOI: 10.1093/mnras/sty559
URI: http://arxiv.org/abs/1710.10075
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 477 Sequence Number: - Start / End Page: 56 - 66 Identifier: ISSN: 1365-8711
CoNE: /journals/resource/1000000000024150