DESI

来自Shiyin's note
Shen讨论 | 贡献2020年10月25日 (日) 14:34的版本 →‎光谱巡天
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http://desi.lbl.gov/

图像

  • BASS[1] lead by Zhouxu
  • DECaLS

光谱巡天

  • 5000 spectra simultaneously
  • wavelength range 360 to 980 nm *
  • spectral resolution of R = between 2000 and 5 500,
  • 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)