%0 Generic %1 yang2022early %A Yang, Lilan %A Morishita, T. %A Leethochawalit, N. %A Castellano, M. %A Calabro, A. %A Treu, T. %A Bonchi, A. %A Fontana, A. %A Mason, C. %A Merlin, E. %A Paris, D. %A Trenti, M. %A Roberts-Borsani, G. %A Bradac, M. %A Vanzella, E. %A Vulcani, B. %A Marchesini, D. %A Ding, X. %A Nanayakkara, Themiya %A Birrer, Simon %A Glazebrook, K. %A Jones, T. %A Boyett, K. %A Santini, P. %A Strait, Victoria %A Wang, Xin %D 2022 %K library %T Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at $z>7$ %U http://arxiv.org/abs/2207.13101 %X We present the first rest-frame optical size-luminosity relation of galaxies at $z>7$, using the NIRCam imaging data obtained by the GLASS Jame Webb Space Telescope Early Release Science (GLASS-JWST-ERS) program, providing the deepest extragalactic data of the ERS campaign. Our sample consist of 21 photometrically selected bright galaxies with $m_F444Włeq27.8$ at $7<z<9$ and $m_F444W<28.2$ at $z\sim9-15$. We measure the size of the galaxies in 5 bands, from the rest-frame optical ($\sim4800\,\AA$) to the ultra-violet (UV; $\sim1600\,\AA$) based on the Sérsic model, and analyze the size-luminosity relation as a function of wavelength. Remarkably, the data quality of NIRCam imaging is sufficient to probe the half-light radius $r_e$ down to $100\,pc$ at $z>7$. Given the limited sample size and magnitude range, we first fix the slope to that observed for larger samples in rest-frame UV using HST samples. The median size $r_0$ at the reference luminosity $M=-21$ decreases slightly from rest-frame optical, $370\pm50\,pc$, to UV, $230\pm50\,pc$. We then re-fit the size-luminosity relation allowing the slope to vary. The slope is consistent with $\beta\sim0.2$ for all bands except F150W, where we find a marginally steeper slope of $\beta=0.51\pm0.13$. The steep UV slope is mainly driven by the smallest and faintest galaxies. If confirmed by larger samples, it implies that the UV size-luminosity relation breaks toward the faint end as suggested by lensing studies.

@misc{yang2022early, abstract = {We present the first rest-frame optical size-luminosity relation of galaxies at $z>7$, using the NIRCam imaging data obtained by the GLASS Jame Webb Space Telescope Early Release Science (GLASS-JWST-ERS) program, providing the deepest extragalactic data of the ERS campaign. Our sample consist of 21 photometrically selected bright galaxies with $m_\text{F444W}\leq27.8$ at $7<z<9$ and $m_\text{F444W}<28.2$ at $z\sim9-15$. We measure the size of the galaxies in 5 bands, from the rest-frame optical ($\sim4800\,{\rm \AA}$) to the ultra-violet (UV; $\sim1600\,{\rm \AA}$) based on the S\'ersic model, and analyze the size-luminosity relation as a function of wavelength. Remarkably, the data quality of NIRCam imaging is sufficient to probe the half-light radius $r_e$ down to $\sim 100\,pc$ at $z>7$. Given the limited sample size and magnitude range, we first fix the slope to that observed for larger samples in rest-frame UV using HST samples. The median size $r_0$ at the reference luminosity $M=-21$ decreases slightly from rest-frame optical, $370\pm50\,pc$, to UV, $230\pm50\,pc$. We then re-fit the size-luminosity relation allowing the slope to vary. The slope is consistent with $\beta\sim0.2$ for all bands except F150W, where we find a marginally steeper slope of $\beta=0.51\pm0.13$. The steep UV slope is mainly driven by the smallest and faintest galaxies. If confirmed by larger samples, it implies that the UV size-luminosity relation breaks toward the faint end as suggested by lensing studies.}, added-at = {2022-07-28T10:59:27.000+0200}, author = {Yang, Lilan and Morishita, T. and Leethochawalit, N. and Castellano, M. and Calabro, A. and Treu, T. and Bonchi, A. and Fontana, A. and Mason, C. and Merlin, E. and Paris, D. and Trenti, M. and Roberts-Borsani, G. and Bradac, M. and Vanzella, E. and Vulcani, B. and Marchesini, D. and Ding, X. and Nanayakkara, Themiya and Birrer, Simon and Glazebrook, K. and Jones, T. and Boyett, K. and Santini, P. and Strait, Victoria and Wang, Xin}, biburl = {https://www.bibsonomy.org/bibtex/29d4470e66530fcf75f5cbcf02d3a062b/gpkulkarni}, description = {Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at $z>7$}, interhash = {9f63a237bd8464f62d741583300072d9}, intrahash = {9d4470e66530fcf75f5cbcf02d3a062b}, keywords = {library}, note = {cite arxiv:2207.13101Comment: Submitted to ApJL, 9 pages, 3 figures, 2 tables}, timestamp = {2022-07-28T10:59:27.000+0200}, title = {Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at $z>7$}, url = {http://arxiv.org/abs/2207.13101}, year = 2022 }