SMILES Data Release II: Probing Galaxy Evolution during Cosmic Noon and Beyond with NIRSpec Medium-Resolution Spectra

TL;DR

The paper introduces the second data release of the SMILES survey, providing NIRSpec spectra of 166 galaxies across a wide redshift range to study galaxy evolution during cosmic noon and beyond.

Contribution

It presents new spectroscopic data, target selection, calibration, and data products for galaxy evolution research using JWST/NIRSpec observations.

Findings

Spectroscopic data of 166 galaxies from z=0 to 7.5.

Catalogs for emission lines and quiescent galaxy fits.

Enables studies of obscured AGN and galaxy environments.

Abstract

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 ($z \sim 1$-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.