The Gas and Stellar Content of a Metal-poor Galaxy at z=8.496 as Revealed by JWST and ALMA
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The Gas and Stellar Content of a Metal-poor Galaxy at z=8.496 as Revealed by JWST and ALMA. / Heintz, K. E.; Gimenez-Arteaga, C.; Fujimoto, S.; Brammer, G.; Espada, D.; Gillman, S.; Gonzalez-Lopez, J.; Greve, T. R.; Harikane, Y.; Hatsukade, B.; Knudsen, K. K.; Koekemoer, A. M.; Kohno, K.; Kokorev, V.; Lee, M. M.; Magdis, G. E.; Nelson, E. J.; Rizzo, F.; Sanders, R. L.; Schaerer, D.; Shapley, A. E.; Strait, V. B.; Toft, S.; Valentino, F.; Wel, A. van der; Vijayan, A. P.; Watson, D.; Bauer, F. E.; Christiansen, C. R.; Wilson, S. N.
In: Astrophysical Journal Letters, Vol. 944, No. 2, 30, 01.02.2023.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - The Gas and Stellar Content of a Metal-poor Galaxy at z=8.496 as Revealed by JWST and ALMA
AU - Heintz, K. E.
AU - Gimenez-Arteaga, C.
AU - Fujimoto, S.
AU - Brammer, G.
AU - Espada, D.
AU - Gillman, S.
AU - Gonzalez-Lopez, J.
AU - Greve, T. R.
AU - Harikane, Y.
AU - Hatsukade, B.
AU - Knudsen, K. K.
AU - Koekemoer, A. M.
AU - Kohno, K.
AU - Kokorev, V.
AU - Lee, M. M.
AU - Magdis, G. E.
AU - Nelson, E. J.
AU - Rizzo, F.
AU - Sanders, R. L.
AU - Schaerer, D.
AU - Shapley, A. E.
AU - Strait, V. B.
AU - Toft, S.
AU - Valentino, F.
AU - Wel, A. van der
AU - Vijayan, A. P.
AU - Watson, D.
AU - Bauer, F. E.
AU - Christiansen, C. R.
AU - Wilson, S. N.
PY - 2023/2/1
Y1 - 2023/2/1
N2 - 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.
AB - 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.
KW - Unified Astronomy Thesaurus concepts
KW - High-redshift galaxies (734)
KW - Galaxies (573)
KW - Interstellar medium (847)
KW - Star formation (1569)
KW - Galaxy formation (595)
KW - Galaxy evolution (594)
KW - STAR-FORMING GALAXIES
KW - C II EMISSION
KW - MASS-METALLICITY RELATION
KW - SIMILAR-TO 6
KW - INTERSTELLAR-MEDIUM
KW - MOLECULAR GAS
KW - SCALING RELATIONS
KW - DUST CONTENT
KW - MAIN-SEQUENCE
KW - REBELS SURVEY
U2 - 10.3847/2041-8213/acb2cf
DO - 10.3847/2041-8213/acb2cf
M3 - Letter
VL - 944
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - 30
ER -
ID: 341014656