Rubin observatory peers deep into the famous COSMOS field

The Vera C. Rubin Observatory recently captured the most detailed view ever of the COSMOS field, a renowned patch of the universe located in the constellation Sextans. This groundbreaking image, produced by Rubin's Legacy Survey of Space and Time (LSST) Camera, showcases hundreds of thousands of galaxies, stars, and celestial environments. This marks the first time the observatory's state-of-the-art camera has generated an image and catalog for scientific research.

The COSMOS field, already extensively studied by astronomers over the past two decades, has served as a reference point for testing new instruments and comparing measurements. Rubin's image, created by stacking hundreds of individual observations, reveals a diverse array of galaxies, including barred spirals, smooth ellipticals, faint red galaxies, and distorted merging galaxies.

The image also features numerous stars from the Milky Way, carefully excluded from the view to prevent obfuscation by the galactic disk and dust and gas clouds in the interstellar medium.

Phil Marshall, deputy director of Rubin Observatory, emphasized the significance of the COSMOS field for LSST science, highlighting its wealth of prior observations and repeated targeting as a valuable testing ground for scientists preparing for the survey data. Bob Blum, director of Rubin Observatory at NSF NOIRLab, noted that repeated visits to the field will enable the discovery of transient and variable objects, such as supernovae, for detailed study.

The new image contains over 500,000 galaxies and 50,000 stars from the Milky Way, demonstrating Rubin's depth, wide coverage, and ability to make repeated observations. These capabilities will support studies of galaxy evolution, cosmic structure, and transient phenomena while validating Rubin's data products ahead of the 10-year survey.