The gMOSS: the galaxy survey and galaxy populations of the large homogeneous field

TL;DR

The gMOSS survey provides a comprehensive catalog of approximately 19,000 galaxies with detailed spectral energy distributions, enabling precise galaxy classification, redshift estimation, and analysis of galaxy populations and star formation history.

Contribution

This work introduces the gMOSS catalog with high-precision photometric redshifts and galaxy properties derived from medium-band observations, enhancing understanding of galaxy evolution.

Findings

Red and blue galaxy populations show distinct age and mass distributions.

Star formation rate density increases up to redshift ~3.

Red sequence galaxies are older and more massive throughout cosmic time.

Abstract

We present the gMOSS (Galaxies of Medium-band One-meter Schmidt telescope Survey) catalog of $\sim$ 19,000 galaxies in 20 filters (4 broadband SDSS and 16 medium-band filters). We observed 2.386 $\mathrm{deg^2}$ on the central part of the HS47.5-22 field with the 1-m Schmidt telescope of the Byurakan Astrophysical Observatory. The gMOSS is a complete flux-limited sample of galaxies with a threshold magnitude of $r$ SDSS $\le$ 22.5 AB. From photometric measurements with 16 medium-band filters and $u$ SDSS, we get spectral energy distributions for each object in the field, which are used for further analysis. Galaxy classification and photometric redshift estimation based on spectral template matching with ZEBRA software. The obtained redshift accuracy is $\sigma_\mathrm{{NMAD}} < 0.0043$. Using the SED-fitting CIGALE code, we obtained the main properties of the stellar population of galaxies, such as rest-frame $(u - r)_{\mathrm{res}}$ colour, stellar mass, extinction, and mass-weighted age with a precision of $0.16 \pm 0.07$ mag, $0.14 \pm 0.04$ dex, $0.27 \pm 0.1$ mag, and $0.08 \pm 0.04$ dex, respectively. Using a dust-corrected colour-mass diagram, we divided the full sample into populations of red and blue galaxies and considered the dependencies between stellar mass and age. Throughout cosmic time, red sequence galaxies remain older and more massive than blue cloud galaxies. The star formation history of a complete subsample of galaxies selected in the redshift range $0.05\le z\le0.015$ with <$\mathrm{log} M \mathrm{>}_\mathrm{[M_\odot]}$>8.3 shows an increase in the SFRD up to $z\sim3$, under the results obtained in earlier studies.