JADES: Balmer Decrement Measurements at redshifts 4 < z < 7
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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2023
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| author | Sandles, Lester D'Eugenio, Francesco Maiolino, Roberto Looser, Tobias J. Arribas, Santiago Baker, William M. Bonaventura, Nina Bunker, Andrew J. Cameron, Alex J. Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma de Graaff, Anna Eisenstein, Daniel J. Hainline, Kevin Ji, Zhiyuan Johnson, Benjamin D. Jones, Gareth C. Kumari, Nimisha Nelson, Erica Perna, Michele Rawle, Tim Rix, Hans-Walter Robertson, Brant Del Pino, Bruno Rodriguez Scholtz, Jan Shivaei, Irene Smit, Renske Sun, Fengwu Tacchella, Sandro Uebler, Hannah Williams, Christina C. Willott, Chris Witstok, Joris |
| author_facet | Sandles, Lester D'Eugenio, Francesco Maiolino, Roberto Looser, Tobias J. Arribas, Santiago Baker, William M. Bonaventura, Nina Bunker, Andrew J. Cameron, Alex J. Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma de Graaff, Anna Eisenstein, Daniel J. Hainline, Kevin Ji, Zhiyuan Johnson, Benjamin D. Jones, Gareth C. Kumari, Nimisha Nelson, Erica Perna, Michele Rawle, Tim Rix, Hans-Walter Robertson, Brant Del Pino, Bruno Rodriguez Scholtz, Jan Shivaei, Irene Smit, Renske Sun, Fengwu Tacchella, Sandro Uebler, Hannah Williams, Christina C. Willott, Chris Witstok, Joris |
| contents | We present Balmer decrement H$α$/ H$β$ measurements for a sample of 51 galaxies at redshifts z = 4-7 observed with the JWST/NIRSpec MSA, as part of the JADES survey. Leveraging 28-hour long exposures and the efficiency of the prism/clear configuration (but also using information from the medium-resolution gratings), we are able to probe directly the low-mass end of the galaxy population, reaching stellar masses Mstar as low as 10^7 Msun . We find that the correlation between Balmer decrement and Mstar is already established at these high redshifts, indicating a rapid build up of dust in moderately massive galaxies at such early epochs. The lowest-mass galaxies in our sample (Mstar = 1-3 x 10^7 Msun ) display a remarkably low Balmer decrement of 2.88 $\pm$ 0.08, consistent with case B, suggesting very little dust content. However, we warn that such a low observed Balmer decrement may also partly be a consequence of an intrinsically lower H$α$/ H$β$, resulting from the extreme conditions of the ionized gas in these primeval and unevolved systems. We further compare the Balmer decrement to continuum-derived star-formation rates (SFR), finding tentative evidence of a correlation, which likely traces the underlying connection between SFR and mass of cold gas. However, we note that larger samples are required to distinguish between direct and primary correlations from indirect and secondary dependencies at such high redshifts. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_03931 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | JADES: Balmer Decrement Measurements at redshifts 4 < z < 7 Sandles, Lester D'Eugenio, Francesco Maiolino, Roberto Looser, Tobias J. Arribas, Santiago Baker, William M. Bonaventura, Nina Bunker, Andrew J. Cameron, Alex J. Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma de Graaff, Anna Eisenstein, Daniel J. Hainline, Kevin Ji, Zhiyuan Johnson, Benjamin D. Jones, Gareth C. Kumari, Nimisha Nelson, Erica Perna, Michele Rawle, Tim Rix, Hans-Walter Robertson, Brant Del Pino, Bruno Rodriguez Scholtz, Jan Shivaei, Irene Smit, Renske Sun, Fengwu Tacchella, Sandro Uebler, Hannah Williams, Christina C. Willott, Chris Witstok, Joris Astrophysics of Galaxies We present Balmer decrement H$α$/ H$β$ measurements for a sample of 51 galaxies at redshifts z = 4-7 observed with the JWST/NIRSpec MSA, as part of the JADES survey. Leveraging 28-hour long exposures and the efficiency of the prism/clear configuration (but also using information from the medium-resolution gratings), we are able to probe directly the low-mass end of the galaxy population, reaching stellar masses Mstar as low as 10^7 Msun . We find that the correlation between Balmer decrement and Mstar is already established at these high redshifts, indicating a rapid build up of dust in moderately massive galaxies at such early epochs. The lowest-mass galaxies in our sample (Mstar = 1-3 x 10^7 Msun ) display a remarkably low Balmer decrement of 2.88 $\pm$ 0.08, consistent with case B, suggesting very little dust content. However, we warn that such a low observed Balmer decrement may also partly be a consequence of an intrinsically lower H$α$/ H$β$, resulting from the extreme conditions of the ionized gas in these primeval and unevolved systems. We further compare the Balmer decrement to continuum-derived star-formation rates (SFR), finding tentative evidence of a correlation, which likely traces the underlying connection between SFR and mass of cold gas. However, we note that larger samples are required to distinguish between direct and primary correlations from indirect and secondary dependencies at such high redshifts. |
| title | JADES: Balmer Decrement Measurements at redshifts 4 < z < 7 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2306.03931 |