Abstract

We combine the power of blind integral field spectroscopy from the Hobby-Eberly Telescope (HET) Dark Energy Experiment (HETDEX) with sources detected in the novel Low Frequency Array (LO-FAR) to construct the HETDEX-LOFAR Spectroscopic Redshift Catalog. Starting from the first data release of the LOFAR Two-metre Sky Survey (LoTSS), including a value-added catalog with photo-metric redshifts, we extracted 18,267 HETDEX spectra. Using an automatic classifying algorithm, we assigned a star, galaxy, or quasar label along with a velocity/redshift. We supplemented these classifications with the continuum and emission line catalogs of the internal, third data release from HETDEX (HDR3). We measured 4,349 new redshifts; in combination with the value-added catalog, our final spectroscopic redshift sample 6,016 sources. This new catalog of distances facilitates research to determine the [O II] emission properties of radio galaxies from 0.0 < z < 0.5 and the Lyman-alpha emission characteristics of both radio galaxies and quasars from 1.9 < z < 3.5. It even allows the study of radio-loud stars in our own Milky Way Galaxy.