EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy
| Title: | EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy |
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| Authors: | Nakajima, Kimihiko, Ouchi, Masami, Xu, Yi, Rauch, Michael, Harikane, Yuichi, Nishigaki, Moka, Isobe, Yuki, Kusakabe, Haruka, Nagao, Tohru, Ono, Yoshiaki, Onodera, Masato, Sugahara, Yuma, Kim, Ji Hoon, Komiyama, Yutaka, Lee, Chien-Hsiu, Zahedy, Fakhri S. |
| Publication Year: | 2022 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Astrophysics of Galaxies |
| More Details: | We present optical-line gas metallicity diagnostics established by the combination of local SDSS galaxies and the largest compilation of extremely metal-poor galaxies (EMPGs) including new EMPGs identified by the Subaru EMPRESS survey. A total of 103 EMPGs are included that cover a large parameter space of magnitude (Mi=-19 to -7) and H-beta equivalent width (10-600 Ang), i.e., wide ranges of stellar mass and star-formation rate. Using reliable metallicity measurements of the direct method for these galaxies, we derive the relationships between strong optical-line ratios and gas-phase metallicity over the range of 12+log(O/H)=~6.9-8.9 corresponding to 0.02-2 solar metallicity Zsun. We confirm that R23-index, ([OIII]+[OII])/H-beta, is the most accurate metallicity indicator with the metallicity uncertainty of 0.14 dex over the range among various popular metallicity indicators. The other metallicity indicators show large scatters in the metal-poor range (<0.1 Zsun). It is explained by our CLOUDY photoionization modeling that, unlike R23-index, the other metallicity indicators do not use a sum of singly and doubly ionized lines and cannot trace both low and high ionization gas. We find that the accuracy of the metallicity indicators is significantly improved, if one uses H-beta equivalent width measurements that tightly correlate with ionization states. In this work, we also present the relation of physical properties with UV-continuum slope beta and ionization production rate xi_ion derived with GALEX data for the EMPGs, and provide local anchors of galaxy properties together with the optical-line metallicity indicators that are available in the form of ASCII table and useful for forthcoming JWST spectroscopic studies. Comment: 33 pages, 14 figures. Accepted for publication in ApJ Supplement Series. Visit https://sci.nao.ac.jp/MEMBER/ouchi/members/nakajima.html for the publicly available table of EMPGs (Table 6) |
| Document Type: | Working Paper |
| DOI: | 10.3847/1538-4365/ac7710 |
| Access URL: | http://arxiv.org/abs/2206.02824 |
| Accession Number: | edsarx.2206.02824 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Nakajima%2C+Kimihiko%22">Nakajima, Kimihiko</searchLink><br /><searchLink fieldCode="AR" term="%22Ouchi%2C+Masami%22">Ouchi, Masami</searchLink><br /><searchLink fieldCode="AR" term="%22Xu%2C+Yi%22">Xu, Yi</searchLink><br /><searchLink fieldCode="AR" term="%22Rauch%2C+Michael%22">Rauch, Michael</searchLink><br /><searchLink fieldCode="AR" term="%22Harikane%2C+Yuichi%22">Harikane, Yuichi</searchLink><br /><searchLink fieldCode="AR" term="%22Nishigaki%2C+Moka%22">Nishigaki, Moka</searchLink><br /><searchLink fieldCode="AR" term="%22Isobe%2C+Yuki%22">Isobe, Yuki</searchLink><br /><searchLink fieldCode="AR" term="%22Kusakabe%2C+Haruka%22">Kusakabe, Haruka</searchLink><br /><searchLink fieldCode="AR" term="%22Nagao%2C+Tohru%22">Nagao, Tohru</searchLink><br /><searchLink fieldCode="AR" term="%22Ono%2C+Yoshiaki%22">Ono, Yoshiaki</searchLink><br /><searchLink fieldCode="AR" term="%22Onodera%2C+Masato%22">Onodera, Masato</searchLink><br /><searchLink fieldCode="AR" term="%22Sugahara%2C+Yuma%22">Sugahara, Yuma</searchLink><br /><searchLink fieldCode="AR" term="%22Kim%2C+Ji+Hoon%22">Kim, Ji Hoon</searchLink><br /><searchLink fieldCode="AR" term="%22Komiyama%2C+Yutaka%22">Komiyama, Yutaka</searchLink><br /><searchLink fieldCode="AR" term="%22Lee%2C+Chien-Hsiu%22">Lee, Chien-Hsiu</searchLink><br /><searchLink fieldCode="AR" term="%22Zahedy%2C+Fakhri+S%2E%22">Zahedy, Fakhri S.</searchLink> – Name: DatePubCY Label: Publication Year Group: Date Data: 2022 – 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: We present optical-line gas metallicity diagnostics established by the combination of local SDSS galaxies and the largest compilation of extremely metal-poor galaxies (EMPGs) including new EMPGs identified by the Subaru EMPRESS survey. A total of 103 EMPGs are included that cover a large parameter space of magnitude (Mi=-19 to -7) and H-beta equivalent width (10-600 Ang), i.e., wide ranges of stellar mass and star-formation rate. Using reliable metallicity measurements of the direct method for these galaxies, we derive the relationships between strong optical-line ratios and gas-phase metallicity over the range of 12+log(O/H)=~6.9-8.9 corresponding to 0.02-2 solar metallicity Zsun. We confirm that R23-index, ([OIII]+[OII])/H-beta, is the most accurate metallicity indicator with the metallicity uncertainty of 0.14 dex over the range among various popular metallicity indicators. The other metallicity indicators show large scatters in the metal-poor range (<0.1 Zsun). It is explained by our CLOUDY photoionization modeling that, unlike R23-index, the other metallicity indicators do not use a sum of singly and doubly ionized lines and cannot trace both low and high ionization gas. We find that the accuracy of the metallicity indicators is significantly improved, if one uses H-beta equivalent width measurements that tightly correlate with ionization states. In this work, we also present the relation of physical properties with UV-continuum slope beta and ionization production rate xi_ion derived with GALEX data for the EMPGs, and provide local anchors of galaxy properties together with the optical-line metallicity indicators that are available in the form of ASCII table and useful for forthcoming JWST spectroscopic studies.<br />Comment: 33 pages, 14 figures. Accepted for publication in ApJ Supplement Series. Visit https://sci.nao.ac.jp/MEMBER/ouchi/members/nakajima.html for the publicly available table of EMPGs (Table 6) – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.3847/1538-4365/ac7710 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2206.02824" linkWindow="_blank">http://arxiv.org/abs/2206.02824</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2206.02824 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3847/1538-4365/ac7710 Subjects: – SubjectFull: Astrophysics - Astrophysics of Galaxies Type: general Titles: – TitleFull: EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Nakajima, Kimihiko – PersonEntity: Name: NameFull: Ouchi, Masami – PersonEntity: Name: NameFull: Xu, Yi – PersonEntity: Name: NameFull: Rauch, Michael – PersonEntity: Name: NameFull: Harikane, Yuichi – PersonEntity: Name: NameFull: Nishigaki, Moka – PersonEntity: Name: NameFull: Isobe, Yuki – PersonEntity: Name: NameFull: Kusakabe, Haruka – PersonEntity: Name: NameFull: Nagao, Tohru – PersonEntity: Name: NameFull: Ono, Yoshiaki – PersonEntity: Name: NameFull: Onodera, Masato – PersonEntity: Name: NameFull: Sugahara, Yuma – PersonEntity: Name: NameFull: Kim, Ji Hoon – PersonEntity: Name: NameFull: Komiyama, Yutaka – PersonEntity: Name: NameFull: Lee, Chien-Hsiu – PersonEntity: Name: NameFull: Zahedy, Fakhri S. IsPartOfRelationships: – BibEntity: Dates: – D: 06 M: 06 Type: published Y: 2022 |
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