The Mass-Metallicity Relation at Cosmic Noon in Overdense Environments: First Results from the MAMMOTH-Grism HST Slitless Spectroscopic Survey

The MAMMOTH-Grism slitless spectroscopic survey is a Hubble Space Telescope (HST) cycle 28 medium program, which is obtaining 45 orbits of WFC3/IR grism spectroscopy in the density peak regions of three massive galaxy protoclusters at z = 2-3 discovered using the MAMMOTH technique. We introduce this survey by presenting the first measurement of the mass-metallicity relation (MZR) at high redshift in overdense environments via grism spectroscopy. From the completed MAMMOTH-Grism observations in the field of the BOSS1244 protocluster at z = 2.24 +/- 0.02, we secure a sample of 36 protocluster member galaxies at z approximate to 2.24, showing strong nebular emission lines ([O III], H beta, and [O II]) in their G141 spectra. Using the multi-wavelength broadband deep imaging from HST and ground-based telescopes, we measure their stellar masses in the range of [10(9), 10(10.4)] M (circle dot), instantaneous star formation rates (SFR) from 10 to 240 M (circle dot) yr(-1), and global gas-phase metallicities [13,1]

Automated summary

The MAMMOTH-Grism slitless spectroscopic survey is a study conducted in the density peak regions of massive galaxy protoclusters at high redshift, aiming to explore the mass-metallicity relation and galaxy evolution through measurements of stellar mass, star formation rate, and gas-phase metallicity.