Images of MACS1149-JD1 presenting the observed stellar and ionized gas structure. From left to right: Archival HST WFPC3/F160W from Hubble Advanced Product Multi-Visit Mosaic (HAP-MVM) program, MIRIM F560W image, and MRS Hα line map. The Hα line map was generated by integrating Hα line emission in the velocity range, −150 < v [km s⁻¹] < 150. The origin of the image corresponds to (RA [deg], Dec [deg]) of (177.389945, +22.412722). The black dashed ellipse indicates the aperture used to perform the MIRIM F560W photometry and the MRS 1D spectral extraction. Dotted black ellipses identify the Hα emitting regions referred to as clump N and S, which are spatially coincident with the two emitting regions in the HST F160W image. Moreover, clump N corresponds to clump C1, and clump S includes clumps C2 and C3 as well as the galaxy component (G) following Bradač et al. (2024) nomenclature. The white area represents the spatial resolution (PSF FWHM) of each observation. MACS1149-JD1 shows an elongated structure due to the lens magnification of cluster MACS J11491+2223 (Zheng et al. 2012).