Newly Improved Ionization Corrections for the Neutral Interstellar Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies throughout the Universe
| Title: | Newly Improved Ionization Corrections for the Neutral Interstellar Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies throughout the Universe |
|---|---|
| Authors: | Hernandez, Svea, Aloisi, Alessandra, James, Bethan L., Ferland, Gary J., Fox, Andrew J., Tosi, Monica, Tumlinson, Jason |
| Publication Year: | 2020 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Astrophysics of Galaxies |
| More Details: | Studies measuring the chemical abundances of the neutral gas in star-forming galaxies (SFGs) require ionization correction factors (ICFs) to accurately measure their metal contents. In the work presented here we calculate newly improved ICFs for a sample of SFGs. These new corrections include both the contaminating ionized gas along the line of sight (ICF$_{\rm ionized}$) and unaccounted higher ionization stages in the neutral gas (ICF$_{\rm neutral}$). We make use of recently acquired spectroscopic observations taken with the Cosmic Origins Spectrograph (COS) on board Hubble to measure column densities for Fe II and Fe III. Using the Fe III/Fe II ratios as well as other physical properties (i.e. $\log$[L$_{\rm UV}$], $N$(H I), T, and $Z$) we generate ad-hoc photoionization models with CLOUDY to quantify the corrections required for each of the targets. We identify a luminosity threshold of $\log$[L$_{\rm UV}$]$\sim$ 40.75 erg s$^{-1}$ above which the ICF$_{\rm neutral}$ values for nitrogen are relatively higher (ICF$_{\rm neutral}=0.05$-0.7) than those for the rest of the elements (ICF$_{\rm neutral}\sim 0.01$). This behavior indicates that for the high UV luminosity objects, N II is found in non-negligible quantities in the neutral gas, making these ICF$_{\rm neutral}$ corrections critical for determining the true abundances in the interstellar medium. In addition, we calculate ICFs from a uniform grid of models covering a wide range of physical properties typically observed in studies of SFGs and extragalactic H II regions. We provide the community with tabulated ICF values for the neutral gas abundances measured from a variety of environments and applicable to chemical studies of the high redshift universe. Comment: 20 pages, 8 tables, 8 Figures, Accepted for Publication in ApJ |
| Document Type: | Working Paper |
| DOI: | 10.3847/1538-4357/ab77c6 |
| Access URL: | http://arxiv.org/abs/2002.07831 |
| Accession Number: | edsarx.2002.07831 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Newly Improved Ionization Corrections for the Neutral Interstellar Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies throughout the Universe – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hernandez%2C+Svea%22">Hernandez, Svea</searchLink><br /><searchLink fieldCode="AR" term="%22Aloisi%2C+Alessandra%22">Aloisi, Alessandra</searchLink><br /><searchLink fieldCode="AR" term="%22James%2C+Bethan+L%2E%22">James, Bethan L.</searchLink><br /><searchLink fieldCode="AR" term="%22Ferland%2C+Gary+J%2E%22">Ferland, Gary J.</searchLink><br /><searchLink fieldCode="AR" term="%22Fox%2C+Andrew+J%2E%22">Fox, Andrew J.</searchLink><br /><searchLink fieldCode="AR" term="%22Tosi%2C+Monica%22">Tosi, Monica</searchLink><br /><searchLink fieldCode="AR" term="%22Tumlinson%2C+Jason%22">Tumlinson, Jason</searchLink> – Name: DatePubCY Label: Publication Year Group: Date Data: 2020 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Astrophysics+of+Galaxies%22">Astrophysics - Astrophysics of Galaxies</searchLink> – Name: Abstract Label: Description Group: Ab Data: Studies measuring the chemical abundances of the neutral gas in star-forming galaxies (SFGs) require ionization correction factors (ICFs) to accurately measure their metal contents. In the work presented here we calculate newly improved ICFs for a sample of SFGs. These new corrections include both the contaminating ionized gas along the line of sight (ICF$_{\rm ionized}$) and unaccounted higher ionization stages in the neutral gas (ICF$_{\rm neutral}$). We make use of recently acquired spectroscopic observations taken with the Cosmic Origins Spectrograph (COS) on board Hubble to measure column densities for Fe II and Fe III. Using the Fe III/Fe II ratios as well as other physical properties (i.e. $\log$[L$_{\rm UV}$], $N$(H I), T, and $Z$) we generate ad-hoc photoionization models with CLOUDY to quantify the corrections required for each of the targets. We identify a luminosity threshold of $\log$[L$_{\rm UV}$]$\sim$ 40.75 erg s$^{-1}$ above which the ICF$_{\rm neutral}$ values for nitrogen are relatively higher (ICF$_{\rm neutral}=0.05$-0.7) than those for the rest of the elements (ICF$_{\rm neutral}\sim 0.01$). This behavior indicates that for the high UV luminosity objects, N II is found in non-negligible quantities in the neutral gas, making these ICF$_{\rm neutral}$ corrections critical for determining the true abundances in the interstellar medium. In addition, we calculate ICFs from a uniform grid of models covering a wide range of physical properties typically observed in studies of SFGs and extragalactic H II regions. We provide the community with tabulated ICF values for the neutral gas abundances measured from a variety of environments and applicable to chemical studies of the high redshift universe.<br />Comment: 20 pages, 8 tables, 8 Figures, Accepted for Publication in ApJ – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.3847/1538-4357/ab77c6 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2002.07831" linkWindow="_blank">http://arxiv.org/abs/2002.07831</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2002.07831 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3847/1538-4357/ab77c6 Subjects: – SubjectFull: Astrophysics - Astrophysics of Galaxies Type: general Titles: – TitleFull: Newly Improved Ionization Corrections for the Neutral Interstellar Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies throughout the Universe Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hernandez, Svea – PersonEntity: Name: NameFull: Aloisi, Alessandra – PersonEntity: Name: NameFull: James, Bethan L. – PersonEntity: Name: NameFull: Ferland, Gary J. – PersonEntity: Name: NameFull: Fox, Andrew J. – PersonEntity: Name: NameFull: Tosi, Monica – PersonEntity: Name: NameFull: Tumlinson, Jason IsPartOfRelationships: – BibEntity: Dates: – D: 18 M: 02 Type: published Y: 2020 |
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