%0 Generic %1 trump2022physical %A Trump, Jonathan R. %A Haro, Pablo Arrabal %A Simons, Raymond C. %A Backhaus, Bren E. %A Amorín, Ricardo O. %A Dickinson, Mark %A Fernández, Vital %A Papovich, Casey %A Nicholls, David C. %A Kewley, Lisa J. %A Brunker, Samantha W. %A Salzer, John J. %A Wilkins, Stephen M. %A Almaini, Omar %A Bagley, Micaela B. %A Berg, Danielle A. %A Bhatawdekar, Rachana %A Bisigello, Laura %A Buat, Véronique %A Burgarella, Denis %A Calabrò, Antonello %A Casey, Caitlin M. %A Ciesla, Laure %A Cleri, Nikko J. %A Cole, Justin W. %A Cooper, M. C. %A Cooray, Asantha R. %A Costantin, Luca %A Ferguson, Henry C. %A Finkelstein, Steven L. %A Fujimoto, Seiji %A Gardner, Jonathan P. %A Gawiser, Eric %A Giavalisco, Mauro %A Grazian, Andrea %A Grogin, Norman A. %A Hathi, Nimish P. %A Hirschmann, Michaela %A Holwerda, Benne W. %A Huertas-Company, Marc %A Hutchison, Taylor A. %A Jogee, Shardha %A Juneau, Stéphanie %A Jung, Intae %A Kartaltepe, Jeyhan S. %A Kirkpatrick, Allison %A Koekemoer, Anton M. %A Lotz, Jennifer M. %A Lucas, Ray A. %A Magnelli, Benjamin %A Matharu, Jasleen %A Pérez-González, Pablo G. %A Pirzkal, Nor %A Rafelski, Marc %A Rose, Caitlin %A Seillé, Lise-Marie %A Somerville, Rachel S. %A Straughn, Amber N. %A Tacchella, Sandro %A Vanderhoof, Brittany N. %A Weiner, Benjamin J. %A Wuyts, Stijn %A Yung, L. Y. Aaron %A Zavala, Jorge A. %D 2022 %K library %T The Physical Conditions of Emission-Line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations %U http://arxiv.org/abs/2207.12388 %X We present rest-frame optical emission-line flux ratio measurements for five $z>5$ galaxies observed by the James Webb Space Telescope Near-Infared Spectrograph (NIRSpec) in the SMACS~0723 Early Release Observations. We add several quality-control and post-processing steps to the NIRSpec pipeline reduction products in order to ensure reliable relative flux calibration of emission lines that are closely separated in wavelength, despite the uncertain absolute spectrophotometry of the current version of the reductions. Compared to $z\sim2$ galaxies in the literature, the $z>5$ galaxies have similar OIII$łambda$5008/H$\beta$ ratios, slightly higher ($\sim$0.5~dex) OIII$łambda$4364/H$\gamma$ ratios and much higher ($\sim$1~dex) NeIII$łambda$3870/OII$łambda$3728 ratios. We compare the observations to MAPPINGS~V photoionization models and find that the measured NeIII$łambda$3870/OII$łambda$3728, OIII$łambda$4364/H$\gamma$, and OIII$łambda$5008/H$\beta$ emission-line ratios are consistent with an interstellar medium that has very high ionization ($łog(Q) 8-9$, units of cm~s$^-1$), low metallicity ($Z/Z_0.1$), and very high pressure ($łog(P/k) 8-9$, units of cm$^-3$). The combination of OIII$łambda$4364/H$\gamma$ and OIII$łambda$(4960+5008)/H$\beta$ line ratios indicate very high electron temperatures of $4.1<łog(T_e)<4.5$, further implying metallicities of $Z/Z_0.1$ with the application of low-redshift calibrations for "direct" metallicities. These observations represent a tantalizing new view of the physical conditions of the interstellar medium in galaxies at cosmic dawn.

@misc{trump2022physical, abstract = {We present rest-frame optical emission-line flux ratio measurements for five $z>5$ galaxies observed by the \textit{James Webb Space Telescope} Near-Infared Spectrograph (NIRSpec) in the SMACS~0723 Early Release Observations. We add several quality-control and post-processing steps to the NIRSpec pipeline reduction products in order to ensure reliable \textit{relative} flux calibration of emission lines that are closely separated in wavelength, despite the uncertain \textit{absolute} spectrophotometry of the current version of the reductions. Compared to $z\sim2$ galaxies in the literature, the $z>5$ galaxies have similar [OIII]$\lambda$5008/H$\beta$ ratios, slightly higher ($\sim$0.5~dex) [OIII]$\lambda$4364/H$\gamma$ ratios and much higher ($\sim$1~dex) [NeIII]$\lambda$3870/[OII]$\lambda$3728 ratios. We compare the observations to MAPPINGS~V photoionization models and find that the measured [NeIII]$\lambda$3870/[OII]$\lambda$3728, [OIII]$\lambda$4364/H$\gamma$, and [OIII]$\lambda$5008/H$\beta$ emission-line ratios are consistent with an interstellar medium that has very high ionization ($\log(Q) \simeq 8-9$, units of cm~s$^{-1}$), low metallicity ($Z/Z_\odot \lesssim 0.1$), and very high pressure ($\log(P/k) \simeq 8-9$, units of cm$^{-3}$). The combination of [OIII]$\lambda$4364/H$\gamma$ and [OIII]$\lambda$(4960+5008)/H$\beta$ line ratios indicate very high electron temperatures of $4.1<\log(T_e)<4.5$, further implying metallicities of $Z/Z_\odot \lesssim 0.1$ with the application of low-redshift calibrations for "direct" metallicities. These observations represent a tantalizing new view of the physical conditions of the interstellar medium in galaxies at cosmic dawn.}, added-at = {2022-07-26T11:07:03.000+0200}, author = {Trump, Jonathan R. and Haro, Pablo Arrabal and Simons, Raymond C. and Backhaus, Bren E. and Amorín, Ricardo O. and Dickinson, Mark and Fernández, Vital and Papovich, Casey and Nicholls, David C. and Kewley, Lisa J. and Brunker, Samantha W. and Salzer, John J. and Wilkins, Stephen M. and Almaini, Omar and Bagley, Micaela B. and Berg, Danielle A. and Bhatawdekar, Rachana and Bisigello, Laura and Buat, Véronique and Burgarella, Denis and Calabrò, Antonello and Casey, Caitlin M. and Ciesla, Laure and Cleri, Nikko J. and Cole, Justin W. and Cooper, M. C. and Cooray, Asantha R. and Costantin, Luca and Ferguson, Henry C. and Finkelstein, Steven L. and Fujimoto, Seiji and Gardner, Jonathan P. and Gawiser, Eric and Giavalisco, Mauro and Grazian, Andrea and Grogin, Norman A. and Hathi, Nimish P. and Hirschmann, Michaela and Holwerda, Benne W. and Huertas-Company, Marc and Hutchison, Taylor A. and Jogee, Shardha and Juneau, Stéphanie and Jung, Intae and Kartaltepe, Jeyhan S. and Kirkpatrick, Allison and Koekemoer, Anton M. and Lotz, Jennifer M. and Lucas, Ray A. and Magnelli, Benjamin and Matharu, Jasleen and Pérez-González, Pablo G. and Pirzkal, Nor and Rafelski, Marc and Rose, Caitlin and Seillé, Lise-Marie and Somerville, Rachel S. and Straughn, Amber N. and Tacchella, Sandro and Vanderhoof, Brittany N. and Weiner, Benjamin J. and Wuyts, Stijn and Yung, L. Y. Aaron and Zavala, Jorge A.}, biburl = {https://www.bibsonomy.org/bibtex/2ad9a36e63850cdd68f1140b8a9c9382f/gpkulkarni}, description = {The Physical Conditions of Emission-Line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations}, interhash = {2b1a4e40758508485099895ab75e1479}, intrahash = {ad9a36e63850cdd68f1140b8a9c9382f}, keywords = {library}, note = {cite arxiv:2207.12388Comment: 13 pages, 6 figures. Submitted to AAS Journals. Comments welcome. Figure 3 set available https://www.dropbox.com/s/go83wpbq1nk5vfe/linefits.ps}, timestamp = {2022-07-26T11:07:03.000+0200}, title = {The Physical Conditions of Emission-Line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations}, url = {http://arxiv.org/abs/2207.12388}, year = 2022 }