“DESI”的版本间差异

2020年10月25日 (日) 14:11的版本

5 000 spectra simultaneously
wavelength range 360 to 980 nm *
spectral resolution of R = between 2000 and 5 500,
fi�ve-year survey starting in 2020,
measuring redshifts over a solid angle of 14 000 deg2
More than 30 million spectroscopic targets will be selected for four different tracer samples

(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

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 * BASS[http://batc.bao.ac.cn/BASS/doku.php] lead by Zhouxu
 * DECaLS
-*
+==光谱巡天==
+*  5 000 spectra simultaneously
+*  wavelength range 360 to 980 nm *
+* spectral resolution of R = between 2000 and 5 500,
+* fi�ve-year survey starting in 2020,
+* measuring redshifts over a solid angle of 14 000 deg2
+* More than 30 million spectroscopic targets will be selected for four different tracer samples
+:* (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
+*  r<19.5 (800 galaxies/deg^2)
+* 19.5 < r < 20  (a secondary sample, 600 galaxies/deg^2)