Early Results from GLASS-JWST. XXV. Electron Density in the Interstellar Medium at $0.7\lesssim z\lesssim 9.3$ with NIRSpec High-resolution Spectroscopy
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| Format: | Preprint |
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2024
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| author | Li, Sijia Wang, Xin Chen, Yuguang Jones, Tucker Treu, Tommaso Glazebrook, Karl He, Xianlong Henry, Alaina Meng, Xiao-Lei Morishita, Takahiro Roberts-Borsani, Guido Yang, Lilan Yu, Hao-Ran Calabrò, Antonello Castellano, Marco Leethochawalit, Nicha Metha, Benjamin Nanayakkara, Themiya Roy, Namrata Vulcani, Benedetta |
| author_facet | Li, Sijia Wang, Xin Chen, Yuguang Jones, Tucker Treu, Tommaso Glazebrook, Karl He, Xianlong Henry, Alaina Meng, Xiao-Lei Morishita, Takahiro Roberts-Borsani, Guido Yang, Lilan Yu, Hao-Ran Calabrò, Antonello Castellano, Marco Leethochawalit, Nicha Metha, Benjamin Nanayakkara, Themiya Roy, Namrata Vulcani, Benedetta |
| contents | The electron density (${n_{\rm e}}$) of the interstellar medium (ISM) in star-forming galaxies is intimately linked to star formation and ionization condition. Using the high-resolution spectra obtained from the JWST NIRSpec micro shutter assembly (MSA) as part of the GLASS-JWST program, we have assembled the largest sample to date (34 galaxies) with individual ${n_{\rm e}}$ measurements derived from the [OII] $λλ$3726,29 and/or [SII] $λλ$6718,32 doublets at $0.7\lesssim z\lesssim 9.3$. The gravitational lensing magnification by the foreground Abell~2744 cluster allows us to probe ${n_{\rm e}}$ in galaxies with stellar masses ($M_{*}$) down to $\simeq 10^{7.5} M_\odot$ across the entire redshift range. Our analysis reveals that the [OII] flux ratios are marginally anti-correlated with specific star formation rate (sSFR) within a 1-$σ$ confidence interval, whereas the [SII] flux ratios show no significant correlation with sSFR. Despite clear correlation between sSFR and redshift within our sample, we find no apparent redshift evolution of ${n_{\rm e}}$ at $z \simeq 1-9$. Our dataset also includes 13 galaxies where ${n_{\rm e}}$ can be measured from both [OII] and [SII]. Contrary to findings at lower redshifts, we observe considerable scatter in ${n_{\rm e}}$ measurements from [OII] and [SII], indicating a complex gaseous environment with significant variations in ${n_{\rm e}}$ in high-redshift galaxies. This work highlights the unique capability of JWST NIRSpec/MSA high-resolution spectroscopy to characterize the detailed physical properties of the ISM in individual high-redshift galaxies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_08382 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Early Results from GLASS-JWST. XXV. Electron Density in the Interstellar Medium at $0.7\lesssim z\lesssim 9.3$ with NIRSpec High-resolution Spectroscopy Li, Sijia Wang, Xin Chen, Yuguang Jones, Tucker Treu, Tommaso Glazebrook, Karl He, Xianlong Henry, Alaina Meng, Xiao-Lei Morishita, Takahiro Roberts-Borsani, Guido Yang, Lilan Yu, Hao-Ran Calabrò, Antonello Castellano, Marco Leethochawalit, Nicha Metha, Benjamin Nanayakkara, Themiya Roy, Namrata Vulcani, Benedetta Astrophysics of Galaxies The electron density (${n_{\rm e}}$) of the interstellar medium (ISM) in star-forming galaxies is intimately linked to star formation and ionization condition. Using the high-resolution spectra obtained from the JWST NIRSpec micro shutter assembly (MSA) as part of the GLASS-JWST program, we have assembled the largest sample to date (34 galaxies) with individual ${n_{\rm e}}$ measurements derived from the [OII] $λλ$3726,29 and/or [SII] $λλ$6718,32 doublets at $0.7\lesssim z\lesssim 9.3$. The gravitational lensing magnification by the foreground Abell~2744 cluster allows us to probe ${n_{\rm e}}$ in galaxies with stellar masses ($M_{*}$) down to $\simeq 10^{7.5} M_\odot$ across the entire redshift range. Our analysis reveals that the [OII] flux ratios are marginally anti-correlated with specific star formation rate (sSFR) within a 1-$σ$ confidence interval, whereas the [SII] flux ratios show no significant correlation with sSFR. Despite clear correlation between sSFR and redshift within our sample, we find no apparent redshift evolution of ${n_{\rm e}}$ at $z \simeq 1-9$. Our dataset also includes 13 galaxies where ${n_{\rm e}}$ can be measured from both [OII] and [SII]. Contrary to findings at lower redshifts, we observe considerable scatter in ${n_{\rm e}}$ measurements from [OII] and [SII], indicating a complex gaseous environment with significant variations in ${n_{\rm e}}$ in high-redshift galaxies. This work highlights the unique capability of JWST NIRSpec/MSA high-resolution spectroscopy to characterize the detailed physical properties of the ISM in individual high-redshift galaxies. |
| title | Early Results from GLASS-JWST. XXV. Electron Density in the Interstellar Medium at $0.7\lesssim z\lesssim 9.3$ with NIRSpec High-resolution Spectroscopy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.08382 |