The Cosmic Ultraviolet Baryon Survey (CUBS) program is a large Hubble Space Telescope (HST) Cycle 25 General Observer program (GO-CUBS; PID=15163), designed to map 'dark' baryonic structures during the crucial but poorly constrained epoch between redshift z = 0.4 and z ~ 2. By integrating absorption-line spectroscopy of 15 UV-bright QSOs at z > 0.8 with deep galaxy survey data, the initial phase utilizes high-resolution far-UV and optical echelle absorption spectra of the QSOs from HST COS and Magellan MIKE. This data set is further enriched by follow-up programs: Circumgalactic Observations of Nuv-shifted Transitions Across Cosmic Time (CONTACT; PID=17517) and Baryonic Escape, Abundances, and Thermodynamics in Cosmic Ecosystems (BEATriCE; PID=18107), which provide high-quality near-UV absorption spectra. Collectively, this legacy sample enables systematic studies of the co-evolution of galaxies and CGM/IGM at a time when the star formation rate density undergoes its most dramatic changes, and provides key insights into how galaxy growth is regulated by accretion and outflows.
The Team
