| In Brief: | IRIS provides imaging and spectroscopic modes over 0.9 - 2.5 microns. Imaging polarimetry and spectropolarimetry modes are also available. Chopping secondary f/36 top end of f/15 top end can be used. |
|---|---|
| Instrument Scientist: | No Instrument Scientist at present. Contact Head of Astronomy for information. |
| Manual: | AAO UM-30a "IRIS Users' Guide" Allen, D.A., 1993 (considerably out-of-date) |
| Other Info: | There is an entry in the Observing Guide. |
Fact Sheet: |
|
| Detector: | 128 x 128 HgCd Te array detector with 60 micron square pixels. |
| Focal Station: | Mounted at Cassegrain focus with either f/15 or f/36 top end. |
| Image Scale: | 1.94 and 0.60 arcsec/pixel at f/15 0.79 and 0.24 arcsec/pixel at f/36 |
| Spectral Resolution*: | R=300 with long slit spectroscopy at f/15 at H or K
(1"x60"
slit) or f/36 (0.4"x25" slit). R=400 with 1.5×1.5 arcsec slit at f/36 covering 0.9-1.4 microns or 1.5-2.5 microns. |
| Filters: | Broad band J, H, K, K', Kn Intermediate band (R~25) centred at 2.21, 2.34 microns Narrow band (R~100) Br gamma, H2 2.122 microns |
| Polarimetry: | imaging polarimetry available at 0.60 and 0.24 arcsec/pixel. Spectropolarimetry available at f/15 (R=300 H, K) |
| Sensitivities: | Photometry at f/36, 0.79 arcsec/pixel, 5 sigma in
2"x2" aperture
after 1 min at J=1.8.5, H=18.3, K=16.8, K'=17.4, Kn=17.4 Spectroscopy at f/36; 3 sigma in 1000s for J=17, H=16, K=15.05 magnitude deeper at f/15 |
| *Spectral Resolution R measured as lambda/delta_lambda, delta_lambda = FWHM unresolved line, usually 2 pixels. | |
