S22B0119
S22B0119
We propose SWIMS-IFU observations for two groups at z>∼ 2 where giant Lyα halos have been detected from our previous Keck/KCWI observations. The Lyα emission can be consistently interpreted as the evidence of the “cold-stream” mode of gas accretion and the target groups are close to the theoretical transition line from the cold-stream to the hot-accretion regimes. By taking advantages of the wide wavelength coverage and wide FoV of SWIMS-IFU, we will measure physical properties of robust member galaxies in the center of the groups under the critical transition phase of accretion modes. Analysis of rest-frame optical emission line spectra will reveal whether SFRs and ISM properties (e.g., gas phase metallicity, electron density, dust attenuation, ionization mechanisms) are different from their field counterparts. We further seek to determine whether galaxy properties are related to the halo properties such as Lyα luminosity and distribution, halo mass, and baryon accretion rate, and whether these groups supposed to be transitioning from cold to hot accretion modes are different from pre- and post-transition groups/clusters surrounded by Lyα halos in the literature. The proposed observations are designed to give significant insight how the different accretion modes affect galaxy evolution.
This document was translated from LATEX by HEVEA.