TY - JOUR
T1 - JWST MIRI Detections of Hα and [O iii] and a Direct Metallicity Measurement of the z = 10.17 Lensed Galaxy MACS0647-JD
AU - Hsiao, Tiger Yu Yang
AU - Álvarez-Márquez, Javier
AU - Coe, Dan
AU - Crespo Gómez, Alejandro
AU - Abdurro’uf, null
AU - Dayal, Pratika
AU - Larson, Rebecca L.
AU - Bik, Arjan
AU - Blanco-Prieto, Carmen
AU - Colina, Luis
AU - Pérez-González, Pablo Guillermo
AU - Costantin, Luca
AU - Prieto-Jiménez, Carlota
AU - Adamo, Angela
AU - Bradley, Larry D.
AU - Conselice, Christopher J.
AU - Fujimoto, Seiji
AU - Furtak, Lukas J.
AU - Hutchison, Taylor A.
AU - James, Bethan L.
AU - Jiménez-Teja, Yolanda
AU - Jung, Intae
AU - Kokorev, Vasily
AU - Mingozzi, Matilde
AU - Norman, Colin
AU - Ricotti, Massimo
AU - Rigby, Jane R.
AU - Sharon, Keren
AU - Vanzella, Eros
AU - Welch, Brian
AU - Xu, Xinfeng
AU - Zackrisson, Erik
AU - Zitrin, Adi
N1 - Publisher Copyright: © 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/10/1
Y1 - 2024/10/1
N2 - JWST spectroscopy has revolutionized our understanding of galaxies in the early Universe. Covering wavelengths up to 5.3 μm, NIRSpec can detect rest-frame optical Hα emission lines out to z = 7 and [O iii] to z = 9.5. Observing these lines in more distant galaxies requires longer wavelength spectroscopy with MIRI. Here we present MIRI Medium Resolution Spectrograph integral field unit observations of the lensed galaxy merger MACS0647-JD at z = 10.165. With exposure times of 4.2 hr in each of two bands (SHORT and LONG), we detect Hα at 9σ, [O iii] λ5008 at 11σ, and [O iii] λ4960 at 3σ. Combined with previously reported NIRSpec spectroscopy that yielded seven emission lines including the auroral line [O iii] λ4363, we present the first direct metallicity measurement of a z > 10 galaxy: 12 + log ( O / H ) = 7.79 ± 0.09 , or 0.13 − 0.03 + 0.02 Z ⊙ . This is similar to galaxies at z ∼ 4-9 with direct metallicity measurements, though higher than expected given the high specific star formation rate log(sSFR/yr−1) = −7.4 ± 0.3. We further constrain the ionization parameter log ( U ) = −1.9 ± 0.1, ionizing photon production efficiency log(ξion) = 25.3 ± 0.1, and SFR = 5.0 ± 0.6 M⊙ yr−1 within the past 10 Myr. These observations demonstrate the combined power of JWST NIRSpec and MIRI for studying galaxies in the first 500 million years.
AB - JWST spectroscopy has revolutionized our understanding of galaxies in the early Universe. Covering wavelengths up to 5.3 μm, NIRSpec can detect rest-frame optical Hα emission lines out to z = 7 and [O iii] to z = 9.5. Observing these lines in more distant galaxies requires longer wavelength spectroscopy with MIRI. Here we present MIRI Medium Resolution Spectrograph integral field unit observations of the lensed galaxy merger MACS0647-JD at z = 10.165. With exposure times of 4.2 hr in each of two bands (SHORT and LONG), we detect Hα at 9σ, [O iii] λ5008 at 11σ, and [O iii] λ4960 at 3σ. Combined with previously reported NIRSpec spectroscopy that yielded seven emission lines including the auroral line [O iii] λ4363, we present the first direct metallicity measurement of a z > 10 galaxy: 12 + log ( O / H ) = 7.79 ± 0.09 , or 0.13 − 0.03 + 0.02 Z ⊙ . This is similar to galaxies at z ∼ 4-9 with direct metallicity measurements, though higher than expected given the high specific star formation rate log(sSFR/yr−1) = −7.4 ± 0.3. We further constrain the ionization parameter log ( U ) = −1.9 ± 0.1, ionizing photon production efficiency log(ξion) = 25.3 ± 0.1, and SFR = 5.0 ± 0.6 M⊙ yr−1 within the past 10 Myr. These observations demonstrate the combined power of JWST NIRSpec and MIRI for studying galaxies in the first 500 million years.
UR - http://www.scopus.com/inward/record.url?scp=85205391221&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ad6562
DO - 10.3847/1538-4357/ad6562
M3 - Article
SN - 0004-637X
VL - 973
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 81
ER -