JWST MIRI detections of H$α$ and [O III] and direct metallicity measurement of the $z=10.17$ lensed galaxy MACS0647$-$JD
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2024
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| author | Hsiao, Tiger Yu-Yang Álvarez-Márquez, Javier Coe, Dan Gómez, Alejandro Crespo Abdurro'uf Dayal, Pratika Larson, Rebecca L. Bik, Arjan Blanco-Prieto, Carmen Colina, Luis Pérez-González, Pablo Guillermo Costantin, Luca Prieto-Jiménez, Carlota Adamo, Angela Bradley, Larry D. Conselice, Christopher J. Fujimoto, Seiji Furtak, Lukas J. Hutchison, Taylor A. James, Bethan L. Jiménez-Teja, Yolanda Jung, Intae Kokorev, Vasily Mingozzi, Matilde Norman, Colin Ricotti, Massimo Rigby, Jane R. Sharon, Keren Vanzella, Eros Welch, Brian Xu, Xinfeng Zackrisson, Erik Zitrin, Adi |
| author_facet | Hsiao, Tiger Yu-Yang Álvarez-Márquez, Javier Coe, Dan Gómez, Alejandro Crespo Abdurro'uf Dayal, Pratika Larson, Rebecca L. Bik, Arjan Blanco-Prieto, Carmen Colina, Luis Pérez-González, Pablo Guillermo Costantin, Luca Prieto-Jiménez, Carlota Adamo, Angela Bradley, Larry D. Conselice, Christopher J. Fujimoto, Seiji Furtak, Lukas J. Hutchison, Taylor A. James, Bethan L. Jiménez-Teja, Yolanda Jung, Intae Kokorev, Vasily Mingozzi, Matilde Norman, Colin Ricotti, Massimo Rigby, Jane R. Sharon, Keren Vanzella, Eros Welch, Brian Xu, Xinfeng Zackrisson, Erik Zitrin, Adi |
| contents | JWST spectroscopy has revolutionized our understanding of galaxies in the early universe. Covering wavelengths up to $5.3\,{\rm μm}$, NIRSpec can detect rest-frame optical emission lines H$α$ 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 MRS IFU observations of the lensed galaxy merger MACS0647$-$JD at $z = 10.165$. With exposure times of 4.2 hours in each of two bands, we detect H$α$ at $9σ$, [O III]$\,\lambda5008$ at $11σ$, and [O III]$\,\lambda4960$ at $3σ$. Combined with previously reported NIRSpec spectroscopy that yields seven emission lines including the auroral line [O III]$\,\lambda4363$, we present the first direct metallicity measurement of a $z > 10$ galaxy: $12+{\rm log(O/H)}= 7.79\pm0.09$, or $0.13^{+0.02}_{-0.03}\,Z_{\odot}$. This is similar to galaxies at $z \sim 4 - 9$ with direct metallicity measurements, though higher than expected given the high specific star formation rate ${\rm log(sSFR / yr^{-1})} = -7.4 \pm 0.3$. We further constrain the ionization parameter ${\rm log}(U)$ = $-1.9 \pm 0.1$, ionizing photon production efficiency ${\rm log}(ξ_{\rm ion})$ = $25.3\pm0.1$, and star formation rate $5.0\pm0.6\,M_{\odot}/{\rm yr}$ within the past $10\,{\rm Myr}$. These observations demonstrate the combined power of JWST NIRSpec and MIRI for studying galaxies in the first $500$ million years. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_16200 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST MIRI detections of H$α$ and [O III] and direct metallicity measurement of the $z=10.17$ lensed galaxy MACS0647$-$JD Hsiao, Tiger Yu-Yang Álvarez-Márquez, Javier Coe, Dan Gómez, Alejandro Crespo Abdurro'uf Dayal, Pratika Larson, Rebecca L. Bik, Arjan Blanco-Prieto, Carmen Colina, Luis Pérez-González, Pablo Guillermo Costantin, Luca Prieto-Jiménez, Carlota Adamo, Angela Bradley, Larry D. Conselice, Christopher J. Fujimoto, Seiji Furtak, Lukas J. Hutchison, Taylor A. James, Bethan L. Jiménez-Teja, Yolanda Jung, Intae Kokorev, Vasily Mingozzi, Matilde Norman, Colin Ricotti, Massimo Rigby, Jane R. Sharon, Keren Vanzella, Eros Welch, Brian Xu, Xinfeng Zackrisson, Erik Zitrin, Adi Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics JWST spectroscopy has revolutionized our understanding of galaxies in the early universe. Covering wavelengths up to $5.3\,{\rm μm}$, NIRSpec can detect rest-frame optical emission lines H$α$ 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 MRS IFU observations of the lensed galaxy merger MACS0647$-$JD at $z = 10.165$. With exposure times of 4.2 hours in each of two bands, we detect H$α$ at $9σ$, [O III]$\,\lambda5008$ at $11σ$, and [O III]$\,\lambda4960$ at $3σ$. Combined with previously reported NIRSpec spectroscopy that yields seven emission lines including the auroral line [O III]$\,\lambda4363$, we present the first direct metallicity measurement of a $z > 10$ galaxy: $12+{\rm log(O/H)}= 7.79\pm0.09$, or $0.13^{+0.02}_{-0.03}\,Z_{\odot}$. This is similar to galaxies at $z \sim 4 - 9$ with direct metallicity measurements, though higher than expected given the high specific star formation rate ${\rm log(sSFR / yr^{-1})} = -7.4 \pm 0.3$. We further constrain the ionization parameter ${\rm log}(U)$ = $-1.9 \pm 0.1$, ionizing photon production efficiency ${\rm log}(ξ_{\rm ion})$ = $25.3\pm0.1$, and star formation rate $5.0\pm0.6\,M_{\odot}/{\rm yr}$ within the past $10\,{\rm Myr}$. These observations demonstrate the combined power of JWST NIRSpec and MIRI for studying galaxies in the first $500$ million years. |
| title | JWST MIRI detections of H$α$ and [O III] and direct metallicity measurement of the $z=10.17$ lensed galaxy MACS0647$-$JD |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.16200 |