“DESI”的版本间差异
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==光谱巡天== |
==光谱巡天== |
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* 5000 spectra simultaneously |
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* wavelength range 360 to 980 nm * |
* wavelength range 360 to 980 nm * |
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* spectral resolution of R = between 2000 and 5 500, |
* spectral resolution of R = between 2000 and 5 500, |
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* 天区覆盖：14000 deg2，总样本 30 million spectroscopic target |
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* fi�ve-year survey starting in 2020, |
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* 四个子样本 |
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* measuring redshifts over a solid angle of 14 000 deg2 |
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* More than 30 million spectroscopic targets will be selected for four different tracer samples |
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:* (i) luminous red galaxies (LRGs) in the redshift range z = 0.3 to z = 1 |
:* (i) luminous red galaxies (LRGs) in the redshift range z = 0.3 to z = 1 |
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:* (ii) emission line galaxies (ELGs) to z = 1.7 |
:* (ii) emission line galaxies (ELGs) to z = 1.7 |
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2020年10月25日 (日) 14:34的版本
- previously BigBOSS
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)