We present the second data release of the Systematic Mid-Infrared Instrument (MIRI) Legacy Extragalactic Survey (SMILES), focusing on JWST/NIRSpec medium-resolution spectroscopy of galaxies across cosmic time. This release includes spectroscopic observations of 166 galaxies spanning 0<z<7.5, sampling star-forming galaxies, quiescent systems, and active galactic nuclei (AGN), with an emphasis on galaxies at cosmic noon (z∼1-3). We describe the target selection strategy, the observational setup with the G140M/F100LP and G235M/F170LP gratings, and the data calibration process. The final data products include the reduced spectra, redshift catalog, emission-line catalogs produced with \texttt{GELATO} for emission-line galaxies and \texttt{pPXF} fits for quiescent systems, and ancillary spectral energy distribution (SED) fit results derived from multi-band photometry. The SMILES NIRSpec dataset enables investigations of obscured AGN, multi-phase outflows, ionizing properties, and the role of environment in galaxy evolution.
@article{arxiv.2508.12599,
title = {SMILES Data Release II: Probing Galaxy Evolution during Cosmic Noon and Beyond with NIRSpec Medium-Resolution Spectra},
author = {Yongda Zhu and Nina Bonaventura and Yang Sun and George H. Rieke and Stacey Alberts and Jianwei Lyu and Irene Shivaei and Jane E. Morrison and Zhiyuan Ji and Eiichi Egami and Jakob M. Helton and Marcia J. Rieke and Pierluigi Rinaldi and Fengwu Sun and Christopher N. A. Willmer},
journal= {arXiv preprint arXiv:2508.12599},
year = {2025}
}
Comments
Accepted for publication in ApJ. The data products can be found at https://github.com/ydzhuastro/smiles_dr2 before publishing on STScI/MAST; DR1 (MIRI) can be found at https://github.com/staceyalberts/JWST-SMILES and http://dx.doi.org/10.17909/et3f-zd57