Work

The Second and Third Data Releases from the UKIRT Hemisphere Survey

Year: 2025

Type: article

Abstract: This paper describes the second and third data releases (DR2 and DR3, respectively) from the ongoing United Kingdom Infrared Telescope Hemisphere Survey (UHS). DR2 is primarily comprised of the K-band portion of the UHS survey, and was released to the public on 2023 June 1. DR3 mainly includes the H-band portion of the survey, with a public release scheduled for September 2025. The H- and K-band data releases complement the previous J-band data release (DR1) from 2018. The survey covers approximately 12,700 square degrees between declinations of 0° and +60° and achieves median 5σ point source sensitivities of 19.0 mag and 18.0 mag (Vega) for H and K, respectively. The data releases include images and source catalogs, which include ∼581 million H-band detections and ∼461 million K-band detections. DR2 and DR3 also include merged catalogs, created by combining J- and K-band detections (DR2) and J-, H-, and K-band detections (DR3). The DR2 merged catalog has a total of ∼513 million sources, while the DR3 merged catalog contains ∼560 million sources.

Source: The Astronomical Journal

DOI: 10.3847/1538-3881/ade43c