The AURORA Survey: A New Era of Emission-line Diagrams with JWST/NIRSpec
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arXiv
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| Natura: | Preprint |
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2024
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| author | Shapley, Alice E. Sanders, Ryan L. Topping, Michael W. Reddy, Naveen A. Berg, Danielle A. Bouwens, Rychard J. Brammer, Gabriel Carnall, Adam C. Cullen, Fergus Davé, Romeel Dunlop, James S. Ellis, Richard S. Schreiber, N. M. Förster Furlanetto, Steven R . Glazebrook, Karl Illingworth, Garth D. Jones, Tucker Kriek, Mariska McLeod, Derek J. McLure, Ross J. Narayanan, Desika Oesch, Pascal Pahl, Anthony J. Pettini, Max Schaerer, Daniel Stark, Daniel P. Steidel, Charles C. Tang, Mengtao Clarke, Leonardo Donnan, Callum T. Kehoe, Emily |
| author_facet | Shapley, Alice E. Sanders, Ryan L. Topping, Michael W. Reddy, Naveen A. Berg, Danielle A. Bouwens, Rychard J. Brammer, Gabriel Carnall, Adam C. Cullen, Fergus Davé, Romeel Dunlop, James S. Ellis, Richard S. Schreiber, N. M. Förster Furlanetto, Steven R . Glazebrook, Karl Illingworth, Garth D. Jones, Tucker Kriek, Mariska McLeod, Derek J. McLure, Ross J. Narayanan, Desika Oesch, Pascal Pahl, Anthony J. Pettini, Max Schaerer, Daniel Stark, Daniel P. Steidel, Charles C. Tang, Mengtao Clarke, Leonardo Donnan, Callum T. Kehoe, Emily |
| contents | We present results on the emission-line properties of z=1.4-7.5 star-forming galaxies in the Assembly of Ultradeep Rest-optical Observations Revealing Astrophysics (AURORA) Cycle 1 JWST/NIRSpec program. Based on its depth, continuous wavelength coverage from 1--5 microns, and medium spectral resolution (R~1000), AURORA includes detections of a large suite of nebular emission lines spanning a broad range in rest wavelength. We investigate the locations of AURORA galaxies in multiple different emission-line diagrams, including traditional "BPT" diagrams of [OIII]/Hbeta vs. [NII]/Halpha, [SII]/Halpha, and [OI]/Halpha, and the "ionization-metallicity" diagram of [OIII]/[OII] (O32) vs. ([OIII]+[OII])/Hbeta (R23). We also consider a bluer rest-frame "ionization-metallicity" diagram introduced recently to characterize z>10 galaxies: [NeIII]/[OII] vs. ([NeIII]+[OII])/Hdelta; as well as longer-wavelength diagnostic diagrams extending into the rest-frame near-IR: [OIII]/Hbeta vs. [SIII]/[SII] (S32); and HeI/Pagamma and [SIII]/Pagamma vs. [FeII]/Pabeta. With a significant boost in signal-to-noise and large, representative samples of individual galaxy detections, the AURORA emission-line diagrams presented here definitively confirm a physical picture in which chemically-young, alpha-enhanced, massive stars photoionize the ISM in distant galaxies with a harder ionizing spectrum at fixed nebular metallicity than in their z~0 counterparts. We also uncover previously unseen evolution prior to z~2 in the [OIII]/Hbeta vs. [NII]/Halpha diagram, which motivates deep NIRSpec observations at even higher redshift. Finally, we present the first statistical sample of rest-frame near-IR emission-line diagnostics in star-forming galaxies at high redshift. In order to truly interpret rest-frame near-IR line ratios including [FeII], we must obtain better constraints on dust depletion in the high-redshift ISM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_00157 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The AURORA Survey: A New Era of Emission-line Diagrams with JWST/NIRSpec Shapley, Alice E. Sanders, Ryan L. Topping, Michael W. Reddy, Naveen A. Berg, Danielle A. Bouwens, Rychard J. Brammer, Gabriel Carnall, Adam C. Cullen, Fergus Davé, Romeel Dunlop, James S. Ellis, Richard S. Schreiber, N. M. Förster Furlanetto, Steven R . Glazebrook, Karl Illingworth, Garth D. Jones, Tucker Kriek, Mariska McLeod, Derek J. McLure, Ross J. Narayanan, Desika Oesch, Pascal Pahl, Anthony J. Pettini, Max Schaerer, Daniel Stark, Daniel P. Steidel, Charles C. Tang, Mengtao Clarke, Leonardo Donnan, Callum T. Kehoe, Emily Astrophysics of Galaxies We present results on the emission-line properties of z=1.4-7.5 star-forming galaxies in the Assembly of Ultradeep Rest-optical Observations Revealing Astrophysics (AURORA) Cycle 1 JWST/NIRSpec program. Based on its depth, continuous wavelength coverage from 1--5 microns, and medium spectral resolution (R~1000), AURORA includes detections of a large suite of nebular emission lines spanning a broad range in rest wavelength. We investigate the locations of AURORA galaxies in multiple different emission-line diagrams, including traditional "BPT" diagrams of [OIII]/Hbeta vs. [NII]/Halpha, [SII]/Halpha, and [OI]/Halpha, and the "ionization-metallicity" diagram of [OIII]/[OII] (O32) vs. ([OIII]+[OII])/Hbeta (R23). We also consider a bluer rest-frame "ionization-metallicity" diagram introduced recently to characterize z>10 galaxies: [NeIII]/[OII] vs. ([NeIII]+[OII])/Hdelta; as well as longer-wavelength diagnostic diagrams extending into the rest-frame near-IR: [OIII]/Hbeta vs. [SIII]/[SII] (S32); and HeI/Pagamma and [SIII]/Pagamma vs. [FeII]/Pabeta. With a significant boost in signal-to-noise and large, representative samples of individual galaxy detections, the AURORA emission-line diagrams presented here definitively confirm a physical picture in which chemically-young, alpha-enhanced, massive stars photoionize the ISM in distant galaxies with a harder ionizing spectrum at fixed nebular metallicity than in their z~0 counterparts. We also uncover previously unseen evolution prior to z~2 in the [OIII]/Hbeta vs. [NII]/Halpha diagram, which motivates deep NIRSpec observations at even higher redshift. Finally, we present the first statistical sample of rest-frame near-IR emission-line diagnostics in star-forming galaxies at high redshift. In order to truly interpret rest-frame near-IR line ratios including [FeII], we must obtain better constraints on dust depletion in the high-redshift ISM. |
| title | The AURORA Survey: A New Era of Emission-line Diagrams with JWST/NIRSpec |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2407.00157 |