TY - JOUR
T1 - Spatially resolved H α and ionizing photon production efficiency in the lensed galaxy MACS1149-JD1 at a redshift of 9.11
AU - Álvarez-Márquez, J.
AU - Colina, L.
AU - Crespo Gómez, A.
AU - Rinaldi, P.
AU - Melinder, J.
AU - Östlin, G.
AU - Annunziatella, M.
AU - Labiano, A.
AU - Bik, A.
AU - Bosman, S.
AU - Greve, T. R.
AU - Wright, G.
AU - Alonso-Herrero, A.
AU - Boogaard, L.
AU - Azollini, R.
AU - Caputi, K. I.
AU - Costantin, L.
AU - Eckart, A.
AU - García-Marín, M.
AU - Gillman, S.
AU - Hjorth, J.
AU - Iani, E.
AU - Ilbert, O.
AU - Jermann, I.
AU - Langeroodi, D.
AU - Meyer, R.
AU - Peißker, F.
AU - Pérez-González, P.
AU - Pye, J. P.
AU - Tikkanen, T.
AU - Topinka, M.
AU - Van Der Werf, P.
AU - Walter, F.
AU - Henning, Th
AU - Ray, T.
N1 - Publisher Copyright:
© 2024 EDP Sciences. All rights reserved.
PY - 2024/6/1
Y1 - 2024/6/1
N2 - We present MIRI/JWST medium-resolution spectroscopy (MRS) and imaging (MIRIM) of the lensed galaxy MACS1149-JD1 at a redshift of z = 9.1092 ± 0.0002, when the Universe was about 530 Myr old. We detect, for the first time, spatially resolved Hα emission in a galaxy at a redshift above nine. The structure of the Hα emitting gas consists of two clumps, S and N, carrying about 60% and 40% of the total flux, respectively. The total Hα luminosity implies an instantaneous star-formation rate in the range of 3.2 ± 0.3 and 5.3 ± 0.4 M⊙ yr-1 for sub-solar and solar metallicities. The ionizing photon production efficiency, log(ζion), shows a spatially resolved structure with values of 25.55 ± 0.03; 25.47 ± 0.03; and 25.91 ± 0.09 Hz erg-1 for the integrated galaxy and clumps S and N, respectively. The Hα rest-frame equivalent width, EW0 (Hα), is 726-182+660 Å for the integrated galaxy, but it presents extreme values of 531-96+300 Å and ¥1951 Å for clumps S and N, respectively. The spatially resolved ionizing photon production efficiency is within the range of values measured in galaxies at a redshift above six and well above the canonical value (25.2 ± 0.1 Hz erg-1). The EW0 (Hα) is a factor of two lower than the predicted value at z = 9.11 based on the extrapolation of the evolution of the EW0 (Hα) with redshifts, α(1 + z)2.1, including galaxies detected with JWST. The extreme difference of the EW0 (Hα) for clumps S and N indicates the presence of a recent (< 5 Myr) stellar burst in clump N and a star formation over a larger period of time (e.g., ~50 Myr) in clump S. The different ages of the stellar population place MACS1149-JD1 and clumps N and S at different locations in the log(ζion) to EW0 (Hα) plane and above the main relation defined from intermediate- and high-redshift (z = 3-7) galaxies detected with JWST. Finally, clump S and N show very different Hα kinematics, with velocity dispersions of 56 ± 4 km s-1 and 113 ± 33 km s-1, likely indicating the presence of outflows or increased turbulence in clump N. The dynamical mass Mdyn = (2.4 ± 0.5) ×109 M⊙, obtained from the size of the integrated Hα ionized nebulae and its velocity dispersion, is within the range previously measured with the spatially resolved [OIII]88 μm line.
AB - We present MIRI/JWST medium-resolution spectroscopy (MRS) and imaging (MIRIM) of the lensed galaxy MACS1149-JD1 at a redshift of z = 9.1092 ± 0.0002, when the Universe was about 530 Myr old. We detect, for the first time, spatially resolved Hα emission in a galaxy at a redshift above nine. The structure of the Hα emitting gas consists of two clumps, S and N, carrying about 60% and 40% of the total flux, respectively. The total Hα luminosity implies an instantaneous star-formation rate in the range of 3.2 ± 0.3 and 5.3 ± 0.4 M⊙ yr-1 for sub-solar and solar metallicities. The ionizing photon production efficiency, log(ζion), shows a spatially resolved structure with values of 25.55 ± 0.03; 25.47 ± 0.03; and 25.91 ± 0.09 Hz erg-1 for the integrated galaxy and clumps S and N, respectively. The Hα rest-frame equivalent width, EW0 (Hα), is 726-182+660 Å for the integrated galaxy, but it presents extreme values of 531-96+300 Å and ¥1951 Å for clumps S and N, respectively. The spatially resolved ionizing photon production efficiency is within the range of values measured in galaxies at a redshift above six and well above the canonical value (25.2 ± 0.1 Hz erg-1). The EW0 (Hα) is a factor of two lower than the predicted value at z = 9.11 based on the extrapolation of the evolution of the EW0 (Hα) with redshifts, α(1 + z)2.1, including galaxies detected with JWST. The extreme difference of the EW0 (Hα) for clumps S and N indicates the presence of a recent (< 5 Myr) stellar burst in clump N and a star formation over a larger period of time (e.g., ~50 Myr) in clump S. The different ages of the stellar population place MACS1149-JD1 and clumps N and S at different locations in the log(ζion) to EW0 (Hα) plane and above the main relation defined from intermediate- and high-redshift (z = 3-7) galaxies detected with JWST. Finally, clump S and N show very different Hα kinematics, with velocity dispersions of 56 ± 4 km s-1 and 113 ± 33 km s-1, likely indicating the presence of outflows or increased turbulence in clump N. The dynamical mass Mdyn = (2.4 ± 0.5) ×109 M⊙, obtained from the size of the integrated Hα ionized nebulae and its velocity dispersion, is within the range previously measured with the spatially resolved [OIII]88 μm line.
KW - Galaxies: high-redshift
KW - Galaxies: individual: MACS1149-JD1
KW - Galaxies: ISM
KW - Galaxies: starburst
UR - http://www.scopus.com/inward/record.url?scp=85194924399&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/202347946
DO - 10.1051/0004-6361/202347946
M3 - Article
AN - SCOPUS:85194924399
SN - 0004-6361
VL - 686
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A85
ER -