The Stellar Abundances and Galactic Evolution Survey (SAGES). I. General Description and the First Data Release (DR1)
/ Authors
Z. Fan, Gang Zhao, Wei Wang, Jie Zheng, Jingkun Zhao, Chun Li, Yuqin Chen, H.-B. Yuan, Haining Li, K. Tan
and 28 more authors
Yi-Han Song, F. Zuo, Yang Huang, A. Luo, A. Esamdin, Lu Ma, Bin Li, N. Song, F. Grupp, Haibin Zhao, S. Ehgamberdiev, O. Burkhonov, G. Feng, Chun-hai Bai, Xuan Zhang, H. Niu, Alisher S. Khodjaev, B. M. Khafizov, I. Asfandiyarov, A. Shaymanov, R. Karimov, Q. Yuldashev, Hao Lu, G. Zhaori, R. Hong, Longfei Hu, Yu-Juan Liu, Zhijian Xu
/ Abstract
The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable to those from low-resolution optical spectra. It was carried out with the 2.3 m Bok telescope of Steward Observatory and three other telescopes. The observations in the u s and v s passband produced over 36,092 frames of images in total, covering a sky area of ∼9960 deg2. The median survey completenesses of all observing fields for the two bands are u s = 20.4 mag and v s = 20.3 mag, respectively, while the limiting magnitudes with signal-to-noise ratio of 100 are u s ∼ 17 mag and v s ∼ 18 mag, correspondingly. We combined our catalog with the data release 1 (DR1) of the first Panoramic Survey Telescope And Rapid Response System (Pan-STARRS, PS1) catalog, and obtained a total of 48,553,987 sources that have at least one photometric measurement in each of the SAGES u s and v s and PS1 grizy passbands. This is the DR1 of SAGES, released in this paper. We compared our gri point-source photometry with those of PS1 and found an rms scatter of ∼2% difference between PS1 and SAGES for the same band. We estimated an internal photometric precision of SAGES to be of the order of ∼1%. Astrometric precision is better than 0.″2 based on comparison with DR1 of the Gaia mission. In this paper, we also describe the final end-user database, and provide some science applications.
Journal: The Astrophysical Journal Supplement Series