Spectroscopy: Grisms and Slits

Spectroscopy is done with the Large Field Objective (pixel scale ~ 0.29 arc / second), one of three slits and one of three grisms.

Long Slits

Slits (arcsec) 2 x 290  1 x 290 0.6 x 290
Table 1. SOFI slits.

Grisms

Grism \ Parameters Order Dispersion Resolution (0.6" slit) Wavelength Range
GB Grism Blue 1 6.96 1000 0.95-1.64
GR Grism Red 1 10.22 1000 1.53-2.52
HR Grism 3 4.63 2200 2.00-2.30
HR Grism 4 3.44 1500 1.49-1.81
HR Grism 5 2.71 1400 1.20-1.28
HR Grism 6 2.32 1400 1.17-1.24
HR Grism 7 1.87 1400 0.89-0.93
HR Grism 8 1.58 1400 0.86-0.95
Table 2. SOFI Spectroscopy modes.

Line Identification

Reccomended DIT/NDIT for Arcs and Flats

  • Arcs: DIT=5 sec, NDIT=10 (for both LR and MR)
  • Flats: DIT=2 sec, NDIT=30 (for both LR and MR)

Distortion maps for spectroscopy

  • Calibration data for distortion corrections, for all spectrosocpic modes (link to the new ftp site; last set of distortion calibrations from 2011-05-16).

Last modified 2011-05-22, V. Ivanov
 
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