Sizes of Lensed Lower-luminosity z=4-8 Galaxies from the Hubble Frontier Field Program. Bouwens, R. J., Illingworth, G. D., van Dokkum, P. G., Oesch, P. A., Stefanon, M., & Ribeiro, B. arXiv:2112.02948 [astro-ph], December, 2021. arXiv: 2112.02948![Sizes of Lensed Lower-luminosity z=4-8 Galaxies from the Hubble Frontier Field Program [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex We constrain the rest-UV size-luminosity relation for star-forming galaxies at z\textasciitilde4 and z\textasciitilde6, 7, and 8 identified behind clusters from the Hubble Frontier Fields (HFF) program. The size-luminosity relation is key to deriving accurate luminosity functions (LF) for faint galaxies. Making use of the latest lensing models and full data set for these clusters, lensing-corrected sizes and luminosities are derived for 68 z\textasciitilde4, 184 z\textasciitilde6, 93 z\textasciitilde7, and 53 z\textasciitilde8 galaxies. We show that size measurements can be reliably measured up to linear magnifications of 30x, where the lensing models are well calibrated. The sizes we measure span a \textgreater1-dex range, from \textless50 pc to \textgreater\textasciitilde500 pc. Uncertainties are based on both the formal fit errors and systematic differences between the public lensing models. These uncertainties range from \textasciitilde20 pc for the smallest sources to 50 pc for the largest. Using a forward-modeling procedure to model the impact of incompleteness and magnification uncertainties, we characterize the size-luminosity relation at both z\textasciitilde4 and z\textasciitilde6-8. We find that the source sizes of star-forming galaxies at z\textasciitilde4 and z\textasciitilde6-8 scale with luminosity L as L\textasciicircum\0.54\textbackslashpm0.08\ and L\textasciicircum\0.40+/-0.04\, respectively, such that lower luminosity (\textgreater\textasciitilde-18 mag) galaxies are smaller than expected from extrapolating the size-luminosity relation at high luminosities (\textless\textasciitilde-18 mag). The new evidence for a steeper size-luminosity relation (3 sigma) adds to earlier evidence for small sizes based on the prevalence of highly magnified galaxies in high shear regions, theoretical arguments against upturns in the LFs, and other independent determinations of the size-luminosity relation from the HFF clusters.
@article{bouwens_sizes_2021,
title = {Sizes of {Lensed} {Lower}-luminosity z=4-8 {Galaxies} from the {Hubble} {Frontier} {Field} {Program}},
url = {http://arxiv.org/abs/2112.02948},
abstract = {We constrain the rest-UV size-luminosity relation for star-forming galaxies at z{\textasciitilde}4 and z{\textasciitilde}6, 7, and 8 identified behind clusters from the Hubble Frontier Fields (HFF) program. The size-luminosity relation is key to deriving accurate luminosity functions (LF) for faint galaxies. Making use of the latest lensing models and full data set for these clusters, lensing-corrected sizes and luminosities are derived for 68 z{\textasciitilde}4, 184 z{\textasciitilde}6, 93 z{\textasciitilde}7, and 53 z{\textasciitilde}8 galaxies. We show that size measurements can be reliably measured up to linear magnifications of 30x, where the lensing models are well calibrated. The sizes we measure span a {\textgreater}1-dex range, from {\textless}50 pc to {\textgreater}{\textasciitilde}500 pc. Uncertainties are based on both the formal fit errors and systematic differences between the public lensing models. These uncertainties range from {\textasciitilde}20 pc for the smallest sources to 50 pc for the largest. Using a forward-modeling procedure to model the impact of incompleteness and magnification uncertainties, we characterize the size-luminosity relation at both z{\textasciitilde}4 and z{\textasciitilde}6-8. We find that the source sizes of star-forming galaxies at z{\textasciitilde}4 and z{\textasciitilde}6-8 scale with luminosity L as L{\textasciicircum}\{0.54{\textbackslash}pm0.08\} and L{\textasciicircum}\{0.40+/-0.04\}, respectively, such that lower luminosity ({\textgreater}{\textasciitilde}-18 mag) galaxies are smaller than expected from extrapolating the size-luminosity relation at high luminosities ({\textless}{\textasciitilde}-18 mag). The new evidence for a steeper size-luminosity relation (3 sigma) adds to earlier evidence for small sizes based on the prevalence of highly magnified galaxies in high shear regions, theoretical arguments against upturns in the LFs, and other independent determinations of the size-luminosity relation from the HFF clusters.},
urldate = {2021-12-20},
journal = {arXiv:2112.02948 [astro-ph]},
author = {Bouwens, R. J. and Illingworth, G. D. and van Dokkum, P. G. and Oesch, P. A. and Stefanon, M. and Ribeiro, B.},
month = dec,
year = {2021},
note = {arXiv: 2112.02948},
keywords = {Astrophysics - Astrophysics of Galaxies},
}
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Making use of the latest lensing models and full data set for these clusters, lensing-corrected sizes and luminosities are derived for 68 z\\textasciitilde4, 184 z\\textasciitilde6, 93 z\\textasciitilde7, and 53 z\\textasciitilde8 galaxies. We show that size measurements can be reliably measured up to linear magnifications of 30x, where the lensing models are well calibrated. The sizes we measure span a \\textgreater1-dex range, from \\textless50 pc to \\textgreater\\textasciitilde500 pc. Uncertainties are based on both the formal fit errors and systematic differences between the public lensing models. These uncertainties range from \\textasciitilde20 pc for the smallest sources to 50 pc for the largest. Using a forward-modeling procedure to model the impact of incompleteness and magnification uncertainties, we characterize the size-luminosity relation at both z\\textasciitilde4 and z\\textasciitilde6-8. We find that the source sizes of star-forming galaxies at z\\textasciitilde4 and z\\textasciitilde6-8 scale with luminosity L as L\\textasciicircum\\0.54\\textbackslashpm0.08\\ and L\\textasciicircum\\0.40+/-0.04\\, respectively, such that lower luminosity (\\textgreater\\textasciitilde-18 mag) galaxies are smaller than expected from extrapolating the size-luminosity relation at high luminosities (\\textless\\textasciitilde-18 mag). The new evidence for a steeper size-luminosity relation (3 sigma) adds to earlier evidence for small sizes based on the prevalence of highly magnified galaxies in high shear regions, theoretical arguments against upturns in the LFs, and other independent determinations of the size-luminosity relation from the HFF clusters.","urldate":"2021-12-20","journal":"arXiv:2112.02948 [astro-ph]","author":[{"propositions":[],"lastnames":["Bouwens"],"firstnames":["R.","J."],"suffixes":[]},{"propositions":[],"lastnames":["Illingworth"],"firstnames":["G.","D."],"suffixes":[]},{"propositions":["van"],"lastnames":["Dokkum"],"firstnames":["P.","G."],"suffixes":[]},{"propositions":[],"lastnames":["Oesch"],"firstnames":["P.","A."],"suffixes":[]},{"propositions":[],"lastnames":["Stefanon"],"firstnames":["M."],"suffixes":[]},{"propositions":[],"lastnames":["Ribeiro"],"firstnames":["B."],"suffixes":[]}],"month":"December","year":"2021","note":"arXiv: 2112.02948","keywords":"Astrophysics - Astrophysics of Galaxies","bibtex":"@article{bouwens_sizes_2021,\n\ttitle = {Sizes of {Lensed} {Lower}-luminosity z=4-8 {Galaxies} from the {Hubble} {Frontier} {Field} {Program}},\n\turl = {http://arxiv.org/abs/2112.02948},\n\tabstract = {We constrain the rest-UV size-luminosity relation for star-forming galaxies at z{\\textasciitilde}4 and z{\\textasciitilde}6, 7, and 8 identified behind clusters from the Hubble Frontier Fields (HFF) program. The size-luminosity relation is key to deriving accurate luminosity functions (LF) for faint galaxies. Making use of the latest lensing models and full data set for these clusters, lensing-corrected sizes and luminosities are derived for 68 z{\\textasciitilde}4, 184 z{\\textasciitilde}6, 93 z{\\textasciitilde}7, and 53 z{\\textasciitilde}8 galaxies. We show that size measurements can be reliably measured up to linear magnifications of 30x, where the lensing models are well calibrated. The sizes we measure span a {\\textgreater}1-dex range, from {\\textless}50 pc to {\\textgreater}{\\textasciitilde}500 pc. Uncertainties are based on both the formal fit errors and systematic differences between the public lensing models. These uncertainties range from {\\textasciitilde}20 pc for the smallest sources to 50 pc for the largest. Using a forward-modeling procedure to model the impact of incompleteness and magnification uncertainties, we characterize the size-luminosity relation at both z{\\textasciitilde}4 and z{\\textasciitilde}6-8. We find that the source sizes of star-forming galaxies at z{\\textasciitilde}4 and z{\\textasciitilde}6-8 scale with luminosity L as L{\\textasciicircum}\\{0.54{\\textbackslash}pm0.08\\} and L{\\textasciicircum}\\{0.40+/-0.04\\}, respectively, such that lower luminosity ({\\textgreater}{\\textasciitilde}-18 mag) galaxies are smaller than expected from extrapolating the size-luminosity relation at high luminosities ({\\textless}{\\textasciitilde}-18 mag). The new evidence for a steeper size-luminosity relation (3 sigma) adds to earlier evidence for small sizes based on the prevalence of highly magnified galaxies in high shear regions, theoretical arguments against upturns in the LFs, and other independent determinations of the size-luminosity relation from the HFF clusters.},\n\turldate = {2021-12-20},\n\tjournal = {arXiv:2112.02948 [astro-ph]},\n\tauthor = {Bouwens, R. J. and Illingworth, G. D. and van Dokkum, P. G. and Oesch, P. A. and Stefanon, M. and Ribeiro, B.},\n\tmonth = dec,\n\tyear = {2021},\n\tnote = {arXiv: 2112.02948},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies},\n}\n\n","author_short":["Bouwens, R. J.","Illingworth, G. D.","van Dokkum, P. G.","Oesch, P. 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