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 |
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 |
Line Identification
- Xenon Lamp with the Blue Grism (Postscript)
- Xenon Lamp with the Red Grism (Postscript)
- Neon and Xenon Lamps with the HR Grism in 3rd order (Ks) (Postscript)
- Neon and Xenon Lamps with the HR Grism in 4th order (H) (Postscript)
- Neon and Xenon Lamps with the HR Grism in 5th and 6th order (J) (Postscript)
- Neon and Xenon Lamps with the HR Grism in 7th and 8th order (Z) (Postscript)
- Xenon-Argon lines from 0.8 to 2.5 microns (from the ISAAC Manual)
- OH Sky lines from 1.0 to 2.2 microns (from the ISAAC Manual)
- New/updated Neon and Xenon arc line list. (Feb 2006)
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