The SSA22 H i Tomography Survey (SSA22-HIT). I. Data Set and Compiled Redshift Catalog

We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope, designed to tomographically map high-z H i gas through analysis of Ly alpha absorption in background galaxies' spectra. In total, 198 galaxies were spectroscopically confirmed at 2.5 < z < 6 with a few low-z exceptions in the 26 x 15 arcmin(2) area, of which 148 were newly determined in this study. Our redshift measurements were merged with previously confirmed redshifts available in the 34 x 27 arcmin(2) area of the SSA22 field. This compiled catalog containing 730 galaxies of various types at z > 2 is useful for various applications, and it is made publicly available. Our SSA22-HIT survey has increased by approximately twice the number of spectroscopic redshifts of sources at z > 3.2 in the observed field. From a comparison with publicly available redshift catalogs, we show that our compiled redshift catalog in the SSA22 field is comparable to those among major extragalactic survey fields in terms of a combination of wide area and high surface number density of objects at z > 2. About 40% of the spectroscopically confirmed objects in SSA22-HIT show reasonable quality of spectra in the wavelengths shorter than Ly alpha when a sufficient amount of smoothing is adopted. Our data set enables us to make the H i tomographic map at z greater than or similar to 3, which we present in a parallel study.

Automated summary

We conducted a deep spectroscopic survey using the DEIMOS instrument on the Keck telescope to map high-z H i gas in the SSA22 field through Ly alpha absorption analysis. We confirmed the spectra of 198 galaxies in the 26 x 15 arcmin(2) area, with a redshift range of 2.5 < z < 6, including 148 newly determined galaxies. Our compiled catalog of 730 galaxies at z > 2 in the SSA22 field is comparable to other major extragalactic survey fields. Our data set allows us to create a tomographic map of H i gas at z greater than or similar to 3.