The Stellar Abundances and Galactic Evolution Survey (SAGES). I. General Description and the First Data Release (DR1)
Zhao, Gang; Fan, Zhou; Wang, Wei; Zheng, Jie; Li, Chun; Song, Nan; Chen, Yuqin; Huang, Yang; Esamdin, Ali; Li, Haining; Yuan, Haibo; Zhao, Jingkun; Feng, Guojie; Li, Bin; Tan, Kefeng; Song, Yihan; Zuo, Fang; Luo, Ali; Ma, Lu; Grupp, Frank; Zhao, Haibin; Ehgamberdiev, Shuhrat A.; Burkhonov, Otabek A.; Bai, Chunhai; Zhang, Xuan; Niu, Hubiao; Khodjaev, Alisher S.; Khafizov, Bakhodir M.; Asfandiyarov, Ildar M.; Shaymanov, Asadulla M.; Karimov, Rivkat G.; Yuldashev, Qudratillo; Lu, Hao; Zhaori, Getu; Hong, Renquan; Hu, Longfei; Liu, Yujuan; Xu, Zhijian
China, Germany, Uzbekistan
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.