DESI
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图像巡天
- The Beijing-Arizona Sky Survey (BASS)
- The DECam Legacy Survey (DECaLS)
- The Mayall z-band Legacy Survey (MzLS)
- https://www.legacysurvey.org/
光谱巡天
- * 5000根光纤
- wavelength range 360 to 980 nm
- spectral resolution of R = between 2000 and 5500
- 天区覆盖:14000 deg2,总样本 30 million spectroscopic target
- 四个子样本
- (i) luminous red galaxies (LRGs) in the redshift range z = 0.3 to z = 1
- (ii) emission line galaxies (ELGs) to z = 1.7
- (iii) quasars to higher redshifts (2.1 < z < 3.5)
- (iv) a magnitude-limited Bright Galaxy Survey out to z~0.6 with a median redshift of z~0.2
BGS
- 在bright observing time进行
- a flux limited sample of around 10 million galaxies
- r<19.5 (800 galaxies/deg^2)
- 19.5 < r < 20 (a secondary sample, 600 galaxies/deg^2)