@misc{10481/80717,
year = {2023},
month = {2},
url = {https://hdl.handle.net/10481/80717},
abstract = {We present a joint analysis of the galaxy S04590 at z = 8.496 based on NIRSpec, NIRCam, and NIRISS observations obtained as part of the Early Release Observations program of the James Webb Space Telescope (JWST) and the far-infrared [C ii] 158 mu m emission line detected by dedicated Atacama Large Millimeter/submillimeter Array (ALMA) observations. We determine the physical properties of S04590 from modeling of the spectral energy distribution (SED) and through the redshifted optical nebular emission lines detected with JWST/NIRSpec. The best-fit SED model reveals a low-mass (M-? = 10(7.2)-10(8) M-?) galaxy with a low oxygen abundance of derived from the strong nebular and auroral emission lines. Assuming that [C ii] effectively traces the interstellar medium, we estimate the total gas mass of the galaxy to be M-gas = (8.0 +/- 4.0) x 10(8) M-? based on the luminosity and spatial extent of [C ii]. This yields an exceptionally high gas fraction, f(gas) = M-gas/(M-gas + M-?) ? 90%, though one still consistent with the range expected for low metallicity. We further derive the metal mass of the galaxy based on the gas mass and gas-phase metallicity, which we find to be consistent with the expected metal production from Type II supernovae. Finally, we make the first constraints on the dust-to-gas (DTG) and dust-to-metal (DTM) ratios of galaxies in the epoch of reionization at z ? 6, showing overall low mass ratios of logDTG < -3.8 and logDTM < -0.5, though they are consistent with established scaling relations and in particular with those of the local metal-poor galaxy I Zwicky 18. Our analysis highlights the synergy between ALMA and JWST in characterizing the gas, metal, and stellar content of the first generation of galaxies.},
organization = {Carlsberg Foundation Reintegration Fellowship	CF21-0103},
organization = {VILLUM FONDEN through the Villum Experiment Programme},
organization = {Carlsberg Foundation	17H06130},
organization = {Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Japan Society for the Promotion of Science},
organization = {Grants-in-Aid for Scientific Research (KAKENHI)	NAS 5-03127},
organization = {NAOJ ALMA Scientific Research},
organization = {Association of Universities for Research in Astronomy, Inc., under NASA	2017-06B},
organization = {Danmarks Grundforskningsfond		
CF20-0534
140},
publisher = {Institute of Physics},
title = {The Gas and Stellar Content of a Metal-poor Galaxy at z=8.496 as Revealed by JWST and ALMA},
doi = {10.3847/2041-8213/acb2cf},
author = {Heintz, K. E. and Espada Fernández, Daniel},
}