Dr Ryan Cooke ryan.j.cooke@durham.ac.uk
Associate Professor
The primordial abundance of deuterium: ionization correction
Cooke, R.; Pettini, M.
Authors
M. Pettini
Abstract
We determine the relative ionization of deuterium and hydrogen in low metallicity damped Lyman α (DLA) and sub-DLA systems using a detailed suite of photoionization simulations. We model metal-poor DLAs as clouds of gas in pressure equilibrium with a host dark matter halo, exposed to the Haardt & Madau background radiation of galaxies and quasars at redshift z ≃ 3. Our results indicate that the deuterium ionization correction correlates with the H i column density and the ratio of successive ion stages of the most commonly observed metals. The N(N ii)/N(N i) column density ratio provides the most reliable correction factor, being essentially independent of the gas geometry, H i column density, and the radiation field. We provide a series of convenient fitting formulae to calculate the deuterium ionization correction based on observable quantities. The ionization correction typically does not exceed 0.1 per cent for metal-poor DLAs, which is comfortably below the current measurement precision (2 per cent). However, the deuterium ionization correction may need to be applied when a larger sample of D/H measurements becomes available.
Citation
Cooke, R., & Pettini, M. (2016). The primordial abundance of deuterium: ionization correction. Monthly Notices of the Royal Astronomical Society, 455(2), 1512-1521. https://doi.org/10.1093/mnras/stv2343
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 6, 2016 |
Online Publication Date | Nov 17, 2016 |
Publication Date | Nov 17, 2016 |
Deposit Date | Feb 20, 2017 |
Publicly Available Date | Feb 22, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 455 |
Issue | 2 |
Pages | 1512-1521 |
DOI | https://doi.org/10.1093/mnras/stv2343 |
Related Public URLs | http://adsabs.harvard.edu/abs/2016MNRAS.455.1512C |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors
Published by Oxford University Press on behalf of the Royal Astronomical Society.
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