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26 April 2024 |
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Tackling the Saturation of Oxygen: The Use of Phosphorus and Sulphur as Proxies Within the Neutral ISM of Star-Forming Galaxies | | Bethan L. James
; Alessandra Aloisi
; | | Date: |
13 Oct 2015 | | Abstract: | The abundance of oxygen in galaxies is widely used in furthering our
understanding of galaxy formation and evolution. Unfortunately, direct
measurements of O/H in the neutral gas are extremely difficult to obtain due to
the fact that the only OI line available within the HST UV wavelength range
(1150-3200A) is often saturated. As such, proxies for oxygen are needed to
indirectly derive an O/H via the assumption that solar ratios based on local
Milky Way sight lines hold in different environments. In this paper, we assess
the validity of using two such proxies, PII and SII, within more typical
star-forming environments. Using HST-COS FUV spectra of a sample of nearby
star-forming galaxies, we find that P and S follow a trend,
log(PII/SII)=1.73+/-0.18, which is in excellent agreement with the solar ratio
of log(P/S)_sol=-1.71+/-0.04 over a large range of galaxy properties, i.e.,
metallicities in the range 0.03-3.2 Z_sol and HI column densities of
log[N(HI)/cm^-2]=18.44-21.28. We additionally show evidence from literature
data that both elements are individually found to trace oxygen according to
their respective solar ratios across a wide-range of environments, such as
stars, ionized gas in nearby galaxies, and neutral gas in DLAs and along Milky
Way sight lines. Our findings demonstrate that the solar ratios of
log(P/O)_sol=-3.28+/-0.06 and log(S/O)_sol=-1.57+/-0.06 can both be used to
derive reliable O/H abundances in the neutral gas of local and high-redshift
star-forming galaxies. | | Source: | arXiv, 1510.3821 | | Services: | Forum | Review | PDF | Favorites | |
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