The BoRG-$JWST$ Survey: Abundance and Mass-to-light Ratio of Luminous $z=7-9$ Galaxies from Independent Sight Lines with NIRSpec
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| Natura: | Preprint |
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2024
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| author | Rojas-Ruiz, Sofía Bagley, Micaela B. Roberts-Borsani, Guido Treu, Tommaso Finkelstein, Steven L. Morishita, Takahiro Leethochawalit, Nicha Mason, Charlotte Bañados, Eduardo Trenti, Michele Stiavelli, Massimo Yung, L. Y. Aaron Haro, Pablo Arrabal Somerville, Rachel S. Soto, Christian |
| author_facet | Rojas-Ruiz, Sofía Bagley, Micaela B. Roberts-Borsani, Guido Treu, Tommaso Finkelstein, Steven L. Morishita, Takahiro Leethochawalit, Nicha Mason, Charlotte Bañados, Eduardo Trenti, Michele Stiavelli, Massimo Yung, L. Y. Aaron Haro, Pablo Arrabal Somerville, Rachel S. Soto, Christian |
| contents | We present new results on the rest-frame UV luminosity function (UVLF) and stellar mass-to-light (M/L) ratio of bright (M$_{\rm UV}\lesssim-20$ mag) spectroscopically-confirmed galaxies at $z=7-9$ derived from the BoRG-$JWST$ survey, a unique data set of NIRSpec prism follow up of $HST$-selected sources from random-pointing imaging. By selecting galaxies from over 200 independent sight lines, the survey minimizes cosmic variance ensuring a statistically robust sample of the bright-galaxy population during the epoch of reionization. The data is used to constrain, for the first time, the bright end of the UVLF at $z=7-9$ from spectroscopically-confirmed galaxies over eight independent fields. We find that the bright end of the UVLF is higher than found using imaging over $JWST$ legacy fields, suggesting the latter may be significantly affected by cosmic variance, and thus reducing the tension with recent findings from $JWST$ at $z>10$ and comparable to models invoking little dust attenuation and bursty star formation. Additionally, we use the galaxies' $JWST$ spectra to infer their stellar masses and M/L ratios relative to other $HST$ and $JWST$ studies. We show that the stellar mass scales almost linearly with UV luminosity (M$_* \propto L_{\rm UV}^{0.85\pm0.12}$), albeit with large ($\sim0.5$ dex) intrinsic scatter, consistent with stochastic bursts of star formation in early galaxy formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_00843 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The BoRG-$JWST$ Survey: Abundance and Mass-to-light Ratio of Luminous $z=7-9$ Galaxies from Independent Sight Lines with NIRSpec Rojas-Ruiz, Sofía Bagley, Micaela B. Roberts-Borsani, Guido Treu, Tommaso Finkelstein, Steven L. Morishita, Takahiro Leethochawalit, Nicha Mason, Charlotte Bañados, Eduardo Trenti, Michele Stiavelli, Massimo Yung, L. Y. Aaron Haro, Pablo Arrabal Somerville, Rachel S. Soto, Christian Astrophysics of Galaxies We present new results on the rest-frame UV luminosity function (UVLF) and stellar mass-to-light (M/L) ratio of bright (M$_{\rm UV}\lesssim-20$ mag) spectroscopically-confirmed galaxies at $z=7-9$ derived from the BoRG-$JWST$ survey, a unique data set of NIRSpec prism follow up of $HST$-selected sources from random-pointing imaging. By selecting galaxies from over 200 independent sight lines, the survey minimizes cosmic variance ensuring a statistically robust sample of the bright-galaxy population during the epoch of reionization. The data is used to constrain, for the first time, the bright end of the UVLF at $z=7-9$ from spectroscopically-confirmed galaxies over eight independent fields. We find that the bright end of the UVLF is higher than found using imaging over $JWST$ legacy fields, suggesting the latter may be significantly affected by cosmic variance, and thus reducing the tension with recent findings from $JWST$ at $z>10$ and comparable to models invoking little dust attenuation and bursty star formation. Additionally, we use the galaxies' $JWST$ spectra to infer their stellar masses and M/L ratios relative to other $HST$ and $JWST$ studies. We show that the stellar mass scales almost linearly with UV luminosity (M$_* \propto L_{\rm UV}^{0.85\pm0.12}$), albeit with large ($\sim0.5$ dex) intrinsic scatter, consistent with stochastic bursts of star formation in early galaxy formation. |
| title | The BoRG-$JWST$ Survey: Abundance and Mass-to-light Ratio of Luminous $z=7-9$ Galaxies from Independent Sight Lines with NIRSpec |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.00843 |