Emission-Line Ratios and Ionization Conditions of CEERS Star-Forming Galaxies with JWST/NIRSpec
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929529289703424 |
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| author | Gupta, Ansh R. Kirkpatrick, Allison Fernandez, Vital Haro, Pablo Arrabal Backhaus, Bren E. Cleri, Nikko J. Grogin, Norman A. Koekemoer, Anton M. |
| author_facet | Gupta, Ansh R. Kirkpatrick, Allison Fernandez, Vital Haro, Pablo Arrabal Backhaus, Bren E. Cleri, Nikko J. Grogin, Norman A. Koekemoer, Anton M. |
| contents | Galaxy emission-line fluxes can be analyzed to determine star formation rates (SFR) and ISM ionization. Here, we investigate rest-frame optical emission lines of 71 star-forming galaxies at redshift 0.7 < z < 7 from the Cosmic Evolution Early Release Science (CEERS) survey using JWST/NIRSpec. We use H$α$ line fluxes to measure SFRs. We combine these with HST CANDELS stellar mass estimates to determine the redshift evolution of specific SFR (sSFR) and compare our sample with the star-forming galaxy main sequence. We create [O III]$λ$5008/H$β$ versus [Ne III]$λ$3870/[O II]$λ$3728 line ratio diagrams and correlate these ratios with sSFR and the distance of each galaxy from the main sequence (excess sSFR). We find a modest correlation between the line ratios and sSFR, which is consistent with previous work analyzing similar samples. However, we find a weak correlation between the line ratios and excess sSFR. Taken together, our results suggest that sSFR is the parameter that governs ionization conditions rather than SFR or a galaxy's distance from the main sequence. These measurements reveal a rich diversity of ISM conditions and physical galaxy properties throughout cosmic time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_03784 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Emission-Line Ratios and Ionization Conditions of CEERS Star-Forming Galaxies with JWST/NIRSpec Gupta, Ansh R. Kirkpatrick, Allison Fernandez, Vital Haro, Pablo Arrabal Backhaus, Bren E. Cleri, Nikko J. Grogin, Norman A. Koekemoer, Anton M. Astrophysics of Galaxies Galaxy emission-line fluxes can be analyzed to determine star formation rates (SFR) and ISM ionization. Here, we investigate rest-frame optical emission lines of 71 star-forming galaxies at redshift 0.7 < z < 7 from the Cosmic Evolution Early Release Science (CEERS) survey using JWST/NIRSpec. We use H$α$ line fluxes to measure SFRs. We combine these with HST CANDELS stellar mass estimates to determine the redshift evolution of specific SFR (sSFR) and compare our sample with the star-forming galaxy main sequence. We create [O III]$λ$5008/H$β$ versus [Ne III]$λ$3870/[O II]$λ$3728 line ratio diagrams and correlate these ratios with sSFR and the distance of each galaxy from the main sequence (excess sSFR). We find a modest correlation between the line ratios and sSFR, which is consistent with previous work analyzing similar samples. However, we find a weak correlation between the line ratios and excess sSFR. Taken together, our results suggest that sSFR is the parameter that governs ionization conditions rather than SFR or a galaxy's distance from the main sequence. These measurements reveal a rich diversity of ISM conditions and physical galaxy properties throughout cosmic time. |
| title | Emission-Line Ratios and Ionization Conditions of CEERS Star-Forming Galaxies with JWST/NIRSpec |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.03784 |