The First Data Release of the Beijing-Arizona Sky Survey

摘要

The Beijing-Arizona Sky Survey (BASS) is a new wide-field legacy imaging survey in the northern Galactic cap using the 2.3 m Bok telescope. The survey will cover about 5400 deg2 in the g and r bands, and the expected 5σ depths (corrected for the Galactic extinction) in these two bands are g?=?24.0 and r?=?23.4 mag (AB magnitude). BASS started observations in 2015 January?and had?completed about 41% of the?area as of 2016 July. The first data release contains calibrated images obtained in 2015 and 2016 and their corresponding single-epoch?and co-added catalogs. The actual depths of the?single-epoch images are g?~?23.4 and r?~?22.9 mag. The full depths of the?three epochs are g?~?24.1 and r?~?23.5 mag.