Spectroscopy with NOTCAM

NOTCAM can be used as an imager and as a spectrograph. The switch between imaging and spectroscopy takes less than a minute, and is achieved by simply moving a slit and a grism into the beam. A switch between imaging/spectroscopy typically requires the telescope to be refocussed.

Camera	Wavelength Range	Dispersion (Å/pixel)	Slit Length	Detector	Comments
WFC low-res spectroscopy	Z 0.83 - 0.95 µm   Y 0.955 - 1.085 µm   Yn 1.00 - 1.05 µm   J 1.16 - 1.33 µm   H 1.48 - 1.78 µm   K 1.95 - 2.36 µm	1.7 in Z     1.9 in Y     2.1 in Yn     2.5 in J     3.1 in H     4.1 in K	4 arcmin	HAWAII 1kx1k HgCdTe	R=2500 with 0.6arcsec slit
HRC med-res spectroscopy	Pa-beta 1.26-1.34 µm  1.57-1.67 µm  Br-gamma 2.07-2.20 µm	0.8     1.0     1.4	80 arcsec	HAWAII 1kx1k HgCdTe	R~5500 with 0.2arcsec slit

Notes:
For WFC spectroscopy the exact range in the K band depends on the choice of K filter (K',K_s,K).
For WFC spectroscopy the J-band range is sampled in two orders which both are sampled on the detector simultaneously (see example image).
For WFC spectroscopy the Z-band range (filter Y_n #222) is sampled in two orders which both are sampled on the detector simultaneously (see example image).

Available slits

For WFC spectroscopy we have a dedicated big slit (approx 0.6 arcsec wide). For HRC spectroscopy we have a dedicated small slit (approx 0.2 arcsec wide), but in principle the big slit can be used as well. There is no wide slit available, but for flux standards a wide pinhole can be used.

Calibration unit

The calibration unit is mounted in the telescope baffle, and can only be used with the mirror cover closed. This causes a 1-minute overhead to open/close the mirror. Note that the Argon lamp takes a while to switch on (please exercise it in the afternoon).