Extreme emission line galaxies detected in JADES JWST/NIRSpec I: inferred galaxy properties
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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2024
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| author | Boyett, Kit Bunker, Andrew J. Curtis-Lake, Emma Chevallard, Jacopo Cameron, Alex J. Jones, Gareth C. Saxena, Aayush Charlot, Stéphane Curti, Mirko Wallace, Imaan E. B. Arribas, Santiago Carniani, Stefano Willott, Chris Alberts, Stacey Eisenstein, Daniel J. Hainline, Kevin Hausen, Ryan Johnson, Benjamin D. Rieke, Marcia Robertson, Brant Stark, Daniel P. Tacchella, Sandro Williams, Christina C. Chen, Zuyi Egami, Eiichi Endsley, Ryan Kumari, Nimisha Laseter, Isaac Looser, Tobias J. Maseda, Michael V. Scholtz, Jan Shivaei, Irene Simmonds, Charlotte Smit, Renske Übler, Hannah Witstok, Joris |
| author_facet | Boyett, Kit Bunker, Andrew J. Curtis-Lake, Emma Chevallard, Jacopo Cameron, Alex J. Jones, Gareth C. Saxena, Aayush Charlot, Stéphane Curti, Mirko Wallace, Imaan E. B. Arribas, Santiago Carniani, Stefano Willott, Chris Alberts, Stacey Eisenstein, Daniel J. Hainline, Kevin Hausen, Ryan Johnson, Benjamin D. Rieke, Marcia Robertson, Brant Stark, Daniel P. Tacchella, Sandro Williams, Christina C. Chen, Zuyi Egami, Eiichi Endsley, Ryan Kumari, Nimisha Laseter, Isaac Looser, Tobias J. Maseda, Michael V. Scholtz, Jan Shivaei, Irene Simmonds, Charlotte Smit, Renske Übler, Hannah Witstok, Joris |
| contents | Extreme emission line galaxies (EELGs) exhibit large equivalent widths (EW) in their rest-optical emission lines ([OIII]$\lambda5007$ or H$α$ rest-frame EW$ > 750Å$) which can be tied to a recent upturn in star formation rate, due to the sensitivity of the nebular line emission and the rest-optical continuum to young ($<10$Myr) and evolved stellar populations, respectively. By studying a sample of 85 star forming galaxies (SFGs), spanning the redshift and magnitude interval $3 <z<9.5$ and $-16>$ M$_{UV}>-21$, in the JWST Advanced Deep Extragalactic Survey (JADES) with NIRSpec/prism spectroscopy, we determine that SFGs initiate an EELG phase when entering a significant burst of star formation, with the highest EWs observed in EELGs with the youngest luminosity-weighted ages ($<5$ Myr old) and the highest burst intensity (those with the greatest excess between their current and long-term average SFR). We spectroscopically confirm that a greater proportion of SFGs are in an EELG phase at high redshift in our UV-selected sample ($61\pm4\%$ in our $z>5.7$ high-redshift bin, compared to $23^{+4}_{-1}\%$ in our lowest-redshift bin $3<z<4.1$) due to the combined evolution of metallicity, ionisation parameter and star formation histories with redshift. We report that the EELGs within our sample exhibit a higher average ionisation efficiency ($\log_{10}(ξ_{ion}^{HII}/$erg$^{-1}$Hz)$=25.5\pm0.2$) than the non-EELGs. High-redshift EELGs therefore comprise a population of efficient ionising photon producers. Additionally, we report that $53\%$ (9/17) of EELGs at $z>5.7$ have observed Lyman-$α$ emission, potentially lying within large ionised regions. The high detection rate of Lyman-$α$ emitters in our EELG selection suggests that the physical conditions associated with entering an EELG phase also promote the escape of Lyman-$α$ photons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_16934 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Extreme emission line galaxies detected in JADES JWST/NIRSpec I: inferred galaxy properties Boyett, Kit Bunker, Andrew J. Curtis-Lake, Emma Chevallard, Jacopo Cameron, Alex J. Jones, Gareth C. Saxena, Aayush Charlot, Stéphane Curti, Mirko Wallace, Imaan E. B. Arribas, Santiago Carniani, Stefano Willott, Chris Alberts, Stacey Eisenstein, Daniel J. Hainline, Kevin Hausen, Ryan Johnson, Benjamin D. Rieke, Marcia Robertson, Brant Stark, Daniel P. Tacchella, Sandro Williams, Christina C. Chen, Zuyi Egami, Eiichi Endsley, Ryan Kumari, Nimisha Laseter, Isaac Looser, Tobias J. Maseda, Michael V. Scholtz, Jan Shivaei, Irene Simmonds, Charlotte Smit, Renske Übler, Hannah Witstok, Joris Astrophysics of Galaxies Extreme emission line galaxies (EELGs) exhibit large equivalent widths (EW) in their rest-optical emission lines ([OIII]$\lambda5007$ or H$α$ rest-frame EW$ > 750Å$) which can be tied to a recent upturn in star formation rate, due to the sensitivity of the nebular line emission and the rest-optical continuum to young ($<10$Myr) and evolved stellar populations, respectively. By studying a sample of 85 star forming galaxies (SFGs), spanning the redshift and magnitude interval $3 <z<9.5$ and $-16>$ M$_{UV}>-21$, in the JWST Advanced Deep Extragalactic Survey (JADES) with NIRSpec/prism spectroscopy, we determine that SFGs initiate an EELG phase when entering a significant burst of star formation, with the highest EWs observed in EELGs with the youngest luminosity-weighted ages ($<5$ Myr old) and the highest burst intensity (those with the greatest excess between their current and long-term average SFR). We spectroscopically confirm that a greater proportion of SFGs are in an EELG phase at high redshift in our UV-selected sample ($61\pm4\%$ in our $z>5.7$ high-redshift bin, compared to $23^{+4}_{-1}\%$ in our lowest-redshift bin $3<z<4.1$) due to the combined evolution of metallicity, ionisation parameter and star formation histories with redshift. We report that the EELGs within our sample exhibit a higher average ionisation efficiency ($\log_{10}(ξ_{ion}^{HII}/$erg$^{-1}$Hz)$=25.5\pm0.2$) than the non-EELGs. High-redshift EELGs therefore comprise a population of efficient ionising photon producers. Additionally, we report that $53\%$ (9/17) of EELGs at $z>5.7$ have observed Lyman-$α$ emission, potentially lying within large ionised regions. The high detection rate of Lyman-$α$ emitters in our EELG selection suggests that the physical conditions associated with entering an EELG phase also promote the escape of Lyman-$α$ photons. |
| title | Extreme emission line galaxies detected in JADES JWST/NIRSpec I: inferred galaxy properties |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.16934 |