EPOCHS III: Unbiased UV continuum slopes at 6.5<z<13 from combined PEARLS GTO and public JWST NIRCam imaging
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2024
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| author | Austin, Duncan Conselice, Christopher J. Adams, Nathan J. Harvey, Thomas Duan, Qiao Trussler, James Li, Qiong Juodzbalis, Ignas Ormerod, Katherine Ferreira, Leonardo Westcott, Lewi Harris, Honor Wilkins, Stephen M. Bhatawdekar, Rachana Caruana, Joseph Coe, Dan Cohen, Seth H. Driver, Simon P. D'Silva, Jordan C. J. Frye, Brenda Furtak, Lukas J. Grogin, Norman A. Hathi, Nimish P. Holwerda, Benne W. Jansen, Rolf A. Koekemoer, Anton M. Marshall, Madeline A. Nonino, Mario Ortiz III, Rafael Pirzkal, Nor Robotham, Aaron Ryan Jr., Russell E. Summers, Jake Willmer, Christopher N. A. Windhorst, Rogier A. Yan, Haojing Zackrisson, Erik |
| author_facet | Austin, Duncan Conselice, Christopher J. Adams, Nathan J. Harvey, Thomas Duan, Qiao Trussler, James Li, Qiong Juodzbalis, Ignas Ormerod, Katherine Ferreira, Leonardo Westcott, Lewi Harris, Honor Wilkins, Stephen M. Bhatawdekar, Rachana Caruana, Joseph Coe, Dan Cohen, Seth H. Driver, Simon P. D'Silva, Jordan C. J. Frye, Brenda Furtak, Lukas J. Grogin, Norman A. Hathi, Nimish P. Holwerda, Benne W. Jansen, Rolf A. Koekemoer, Anton M. Marshall, Madeline A. Nonino, Mario Ortiz III, Rafael Pirzkal, Nor Robotham, Aaron Ryan Jr., Russell E. Summers, Jake Willmer, Christopher N. A. Windhorst, Rogier A. Yan, Haojing Zackrisson, Erik |
| contents | We present an analysis of rest-frame UV continuum slopes, $β$, using a sample of 1011 galaxies at $6.5<z<13$ from the EPOCHS photometric sample collated from the GTO PEARLS and public ERS/GTO/GO (JADES, CEERS, NGDEEP, GLASS) JWST NIRCam imaging across $178.9~\mathrm{arcmin}^2$ of unmasked blank sky. We correct our UV slopes for the photometric error coupling bias using $200,000$ power law SEDs for each $β=\{-1,-1.5,-2,-2.5,-3\}$ in each field, finding biases as large as $Δβ\simeq-0.55$ for the lowest SNR galaxies in our sample. Additionally, we simulate the impact of rest-UV line emission (including Ly$α$) and damped Ly$α$ systems on our measured $β$, finding biases as large as $0.5-0.6$ for the most extreme systems. We find a decreasing trend with redshift of $β=-1.51\pm0.08-(0.097\pm0.010)\times z$, with potential evidence for Pop.~III stars or top-heavy initial mass functions (IMFs) in a subsample of 68 $β+σ_β<-2.8$ galaxies. At $z\simeq11.5$, we measure an extremely blue $β(M_{\mathrm{UV}}=-19)=-2.73\pm0.06$, deviating from simulations, indicative of low-metallicity galaxies with non-zero Lyman continuum escape fractions $f_{\mathrm{esc, LyC}}\gtrsim0$ and minimal dust content. The observed steepening of $\mathrm{d}β/\mathrm{d}\log_{10}(M_{\star}/\mathrm{M}_{\odot})$ from $0.22\pm0.02$ at $z=7$ to $0.81\pm0.13$ at $z=11.5$ implies that dust produced in core-collapse supernovae (SNe) at early times may be ejected via outflows from low mass galaxies. We also observe a flatter $\mathrm{d}β/\mathrm{d}M_{\mathrm{UV}}=0.03\pm0.02$ at $z=7$ and a shallower $\mathrm{d}β/\mathrm{d}\log_{10}(M_{\star} / \mathrm{M}_{\odot})$ at $z<11$ than seen by HST, unveiling a new population of low mass, faint, galaxies reddened by dust produced in the stellar winds of asymptotic giant branch (AGB) stars or carbon-rich Wolf-Rayet binaries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_10751 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | EPOCHS III: Unbiased UV continuum slopes at 6.5<z<13 from combined PEARLS GTO and public JWST NIRCam imaging Austin, Duncan Conselice, Christopher J. Adams, Nathan J. Harvey, Thomas Duan, Qiao Trussler, James Li, Qiong Juodzbalis, Ignas Ormerod, Katherine Ferreira, Leonardo Westcott, Lewi Harris, Honor Wilkins, Stephen M. Bhatawdekar, Rachana Caruana, Joseph Coe, Dan Cohen, Seth H. Driver, Simon P. D'Silva, Jordan C. J. Frye, Brenda Furtak, Lukas J. Grogin, Norman A. Hathi, Nimish P. Holwerda, Benne W. Jansen, Rolf A. Koekemoer, Anton M. Marshall, Madeline A. Nonino, Mario Ortiz III, Rafael Pirzkal, Nor Robotham, Aaron Ryan Jr., Russell E. Summers, Jake Willmer, Christopher N. A. Windhorst, Rogier A. Yan, Haojing Zackrisson, Erik Astrophysics of Galaxies We present an analysis of rest-frame UV continuum slopes, $β$, using a sample of 1011 galaxies at $6.5<z<13$ from the EPOCHS photometric sample collated from the GTO PEARLS and public ERS/GTO/GO (JADES, CEERS, NGDEEP, GLASS) JWST NIRCam imaging across $178.9~\mathrm{arcmin}^2$ of unmasked blank sky. We correct our UV slopes for the photometric error coupling bias using $200,000$ power law SEDs for each $β=\{-1,-1.5,-2,-2.5,-3\}$ in each field, finding biases as large as $Δβ\simeq-0.55$ for the lowest SNR galaxies in our sample. Additionally, we simulate the impact of rest-UV line emission (including Ly$α$) and damped Ly$α$ systems on our measured $β$, finding biases as large as $0.5-0.6$ for the most extreme systems. We find a decreasing trend with redshift of $β=-1.51\pm0.08-(0.097\pm0.010)\times z$, with potential evidence for Pop.~III stars or top-heavy initial mass functions (IMFs) in a subsample of 68 $β+σ_β<-2.8$ galaxies. At $z\simeq11.5$, we measure an extremely blue $β(M_{\mathrm{UV}}=-19)=-2.73\pm0.06$, deviating from simulations, indicative of low-metallicity galaxies with non-zero Lyman continuum escape fractions $f_{\mathrm{esc, LyC}}\gtrsim0$ and minimal dust content. The observed steepening of $\mathrm{d}β/\mathrm{d}\log_{10}(M_{\star}/\mathrm{M}_{\odot})$ from $0.22\pm0.02$ at $z=7$ to $0.81\pm0.13$ at $z=11.5$ implies that dust produced in core-collapse supernovae (SNe) at early times may be ejected via outflows from low mass galaxies. We also observe a flatter $\mathrm{d}β/\mathrm{d}M_{\mathrm{UV}}=0.03\pm0.02$ at $z=7$ and a shallower $\mathrm{d}β/\mathrm{d}\log_{10}(M_{\star} / \mathrm{M}_{\odot})$ at $z<11$ than seen by HST, unveiling a new population of low mass, faint, galaxies reddened by dust produced in the stellar winds of asymptotic giant branch (AGB) stars or carbon-rich Wolf-Rayet binaries. |
| title | EPOCHS III: Unbiased UV continuum slopes at 6.5<z<13 from combined PEARLS GTO and public JWST NIRCam imaging |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.10751 |