%0 Generic %1 leethochawalit2022early %A Leethochawalit, N. %A Trenti, M. %A Santini, P. %A Yang, L. %A Merlin, E. %A Castellano, M. %A Fontana, A. %A Treu, T. %A Mason, C. %A Glazebrook, K. %A Jones, T. %A Vulcani, B. %A Nanayakkara, T. %A Marchesini, D. %A Mascia, S. %A Morishita, T. %A Roberts-Borsani, G. %A Bonchi, A. %A Paris, D. %A Boyett, K. %A Strait, V. %A Calabro`, A. %A Pentericci, L. %A Bradac, M. %A Wang, X. %A Scarlata, C. %D 2022 %K library %T Early results from GLASS-JWST. X: Rest-frame UV-optical properties of galaxies at 7 < z < 9 %U http://arxiv.org/abs/2207.11135 %X We present the first James Webb Space Telescope/NIRCam-led determination of $7<z<9$ galaxy properties based on broadband imaging from 0.8 to 5 microns as part of the GLASS-JWST Early Release Science program. This is the deepest dataset acquired at these wavelengths to date, with an angular resolution $łesssim0.14$ arcsec. We robustly identify 14 galaxies with S/N>8 in F444W from 8 arcmin$^2$ of data at $m_AB28$ from a combination of dropout and photometric redshift selection. From simulated data modeling, we estimate the dropout sample purity to be $\gtrsim90\%$. We find that the number density of these sources is broadly consistent with expectations from the UV luminosity function determined from Hubble Space Telescope data. We characterize galaxy physical properties using a Bayesian Spectral Energy Distribution fitting method, finding median stellar mass $10^8.7M_ødot$ and age 130 Myr, indicating they started ionizing their surroundings at redshift $z>9.5$. Their star formation main sequence is consistent with predictions from simulations. Lastly, we introduce an analytical framework to constrain main-sequence evolution at $z>7$ based on galaxy ages and basic assumptions, through which we find results consistent with expectations from cosmological simulations. While this work only gives a glimpse of the properties of typical galaxies that are thought to drive the reionization of the universe, it clearly shows the potential of JWST to unveil unprecedented details on galaxy formation in the first billion years.

@misc{leethochawalit2022early, abstract = {We present the first James Webb Space Telescope/NIRCam-led determination of $7<z<9$ galaxy properties based on broadband imaging from 0.8 to 5 microns as part of the GLASS-JWST Early Release Science program. This is the deepest dataset acquired at these wavelengths to date, with an angular resolution $\lesssim0.14$ arcsec. We robustly identify 14 galaxies with S/N>8 in F444W from 8 arcmin$^2$ of data at $m_{AB}\leq 28$ from a combination of dropout and photometric redshift selection. From simulated data modeling, we estimate the dropout sample purity to be $\gtrsim90\%$. We find that the number density of these sources is broadly consistent with expectations from the UV luminosity function determined from Hubble Space Telescope data. We characterize galaxy physical properties using a Bayesian Spectral Energy Distribution fitting method, finding median stellar mass $10^{8.7}M_\odot$ and age 130 Myr, indicating they started ionizing their surroundings at redshift $z>9.5$. Their star formation main sequence is consistent with predictions from simulations. Lastly, we introduce an analytical framework to constrain main-sequence evolution at $z>7$ based on galaxy ages and basic assumptions, through which we find results consistent with expectations from cosmological simulations. While this work only gives a glimpse of the properties of typical galaxies that are thought to drive the reionization of the universe, it clearly shows the potential of JWST to unveil unprecedented details on galaxy formation in the first billion years.}, added-at = {2022-07-25T10:54:50.000+0200}, author = {Leethochawalit, N. and Trenti, M. and Santini, P. and Yang, L. and Merlin, E. and Castellano, M. and Fontana, A. and Treu, T. and Mason, C. and Glazebrook, K. and Jones, T. and Vulcani, B. and Nanayakkara, T. and Marchesini, D. and Mascia, S. and Morishita, T. and Roberts-Borsani, G. and Bonchi, A. and Paris, D. and Boyett, K. and Strait, V. and Calabro`, A. and Pentericci, L. and Bradac, M. and Wang, X. and Scarlata, C.}, biburl = {https://www.bibsonomy.org/bibtex/2c713d0d2a1421b41c02a870c9bad39bf/gpkulkarni}, description = {Early results from GLASS-JWST. X: Rest-frame UV-optical properties of galaxies at 7 < z < 9}, interhash = {ab4c6ba70fa5d719f1d3ede00e409a7d}, intrahash = {c713d0d2a1421b41c02a870c9bad39bf}, keywords = {library}, note = {cite arxiv:2207.11135Comment: Submitted to ApJL. 12 pages, 3 Figures}, timestamp = {2022-07-25T10:54:50.000+0200}, title = {Early results from GLASS-JWST. X: Rest-frame UV-optical properties of galaxies at 7 < z < 9}, url = {http://arxiv.org/abs/2207.11135}, year = 2022 }