Spatially-resolved H$α$ and ionizing photon production efficiency in the lensed galaxy MACS1149-JD1 at a redshift of 9.11
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| Format: | Preprint |
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2023
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| author | Álvarez-Márquez, J. Colina, L. Gómez, A. Crespo Rinaldi, P. Melinder, J. Östlin, G. Annunziatella, M. Labiano, A. Bik, A. Bosman, S. Greve, T. R. Wright, G. Alonso-Herrero, A. Boogaard, L. Azollini, R. Caputi, K. I. Costantin, L. Eckart, A. GarcÍa-MarÍn, M. Gillman, S. Hjorth, J. Iani, E. Ilbert, O. Jermann, I. Langeroodi, D. Meyer, R. Peissker, F. Pérez-González, P. Pye, J. P. Tikkanen, T. Topinka, M. van der Werf, P. Walter, F. Henning, Th. Ray, T. |
| author_facet | Álvarez-Márquez, J. Colina, L. Gómez, A. Crespo Rinaldi, P. Melinder, J. Östlin, G. Annunziatella, M. Labiano, A. Bik, A. Bosman, S. Greve, T. R. Wright, G. Alonso-Herrero, A. Boogaard, L. Azollini, R. Caputi, K. I. Costantin, L. Eckart, A. GarcÍa-MarÍn, M. Gillman, S. Hjorth, J. Iani, E. Ilbert, O. Jermann, I. Langeroodi, D. Meyer, R. Peissker, F. Pérez-González, P. Pye, J. P. Tikkanen, T. Topinka, M. van der Werf, P. Walter, F. Henning, Th. Ray, T. |
| contents | We present MIRI/JWST medium-resolution spectroscopy (MRS) and imaging (MIRIM) of the lensed galaxy MACS1149-JD1 at a redshift of $z$=9.1092$\pm$0.0002 (Universe age about 530 Myr). We detect, for the first time, spatially resolved H$α$ emission in a galaxy at a redshift above nine. The structure of the H$α$ emitting gas consists of two clumps, S and N. The total H$α$ luminosity implies an instantaneous star-formation of 5.3$\pm$0.4 $M_{\odot}$ yr$^{-1}$ for solar metallicities. The ionizing photon production efficiency, $\log(ζ_\mathrm{ion})$, shows a spatially resolved structure with values of 25.55$\pm$0.03, 25.47$\pm$0.03, and 25.91$\pm$0.09 Hz erg$^{-1}$ for the integrated galaxy, and clumps S and N, respectively. The H$α$ rest-frame equivalent width, EW$_{0}$(H$α$), is 726$^{+660}_{-182}$ Ángstrom for the integrated galaxy, but presents extreme values of 531$^{+300}_{-96}$ Ángstrom and $\geq$1951 Ángstrom for clumps S and N, respectively. The spatially resolved ionizing photon production efficiency is within the range of values measured in galaxies at redshift above six, and well above the canonical value (25.2$\pm$0.1 Hz erg$^{-1}$). The extreme difference of EW$_{0}$(H$α$) for Clumps S and N indicates the presence of a recent (<5 Myrs) burst in clump N and a star formation over a larger period of time (e.g., $\sim$50 Myr) in clump S. Finally, clump S and N show very different H$α$ kinematics with velocity dispersions of 56$\pm$4 km s$^{-1}$ and 113$\pm$33 km s$^{-1}$, likely indicating the presence of outflows or increased turbulence in the clump N. The dynamical mass, $M_\mathrm{dyn}$= (2.4$\pm$0.5)$\times$10$^{9}$ $M_{\odot}$, is within the range measured with the spatially resolved [OIII]88$μ$m line. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_06319 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spatially-resolved H$α$ and ionizing photon production efficiency in the lensed galaxy MACS1149-JD1 at a redshift of 9.11 Álvarez-Márquez, J. Colina, L. Gómez, A. Crespo Rinaldi, P. Melinder, J. Östlin, G. Annunziatella, M. Labiano, A. Bik, A. Bosman, S. Greve, T. R. Wright, G. Alonso-Herrero, A. Boogaard, L. Azollini, R. Caputi, K. I. Costantin, L. Eckart, A. GarcÍa-MarÍn, M. Gillman, S. Hjorth, J. Iani, E. Ilbert, O. Jermann, I. Langeroodi, D. Meyer, R. Peissker, F. Pérez-González, P. Pye, J. P. Tikkanen, T. Topinka, M. van der Werf, P. Walter, F. Henning, Th. Ray, T. Astrophysics of Galaxies We present MIRI/JWST medium-resolution spectroscopy (MRS) and imaging (MIRIM) of the lensed galaxy MACS1149-JD1 at a redshift of $z$=9.1092$\pm$0.0002 (Universe age about 530 Myr). We detect, for the first time, spatially resolved H$α$ emission in a galaxy at a redshift above nine. The structure of the H$α$ emitting gas consists of two clumps, S and N. The total H$α$ luminosity implies an instantaneous star-formation of 5.3$\pm$0.4 $M_{\odot}$ yr$^{-1}$ for solar metallicities. The ionizing photon production efficiency, $\log(ζ_\mathrm{ion})$, shows a spatially resolved structure with values of 25.55$\pm$0.03, 25.47$\pm$0.03, and 25.91$\pm$0.09 Hz erg$^{-1}$ for the integrated galaxy, and clumps S and N, respectively. The H$α$ rest-frame equivalent width, EW$_{0}$(H$α$), is 726$^{+660}_{-182}$ Ángstrom for the integrated galaxy, but presents extreme values of 531$^{+300}_{-96}$ Ángstrom and $\geq$1951 Ángstrom for clumps S and N, respectively. The spatially resolved ionizing photon production efficiency is within the range of values measured in galaxies at redshift above six, and well above the canonical value (25.2$\pm$0.1 Hz erg$^{-1}$). The extreme difference of EW$_{0}$(H$α$) for Clumps S and N indicates the presence of a recent (<5 Myrs) burst in clump N and a star formation over a larger period of time (e.g., $\sim$50 Myr) in clump S. Finally, clump S and N show very different H$α$ kinematics with velocity dispersions of 56$\pm$4 km s$^{-1}$ and 113$\pm$33 km s$^{-1}$, likely indicating the presence of outflows or increased turbulence in the clump N. The dynamical mass, $M_\mathrm{dyn}$= (2.4$\pm$0.5)$\times$10$^{9}$ $M_{\odot}$, is within the range measured with the spatially resolved [OIII]88$μ$m line. |
| title | Spatially-resolved H$α$ and ionizing photon production efficiency in the lensed galaxy MACS1149-JD1 at a redshift of 9.11 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2309.06319 |