Sigma QUick Infrared Camera Setup and Observing with Quirc, Dewar Temperature, Camera Sensitivity

October 30, 1997 3

2.2Dewar Temperature

The dewar now has a temperature sensor and heater. For normal operation, the temperature controller should be used to set the detector temperature to 80.0K. If the controller is not used, drifts can occur as the telescope is moved, resulting in dark current instabilities in the array. The new array is not thought to be more sensitive to these effects than the previous detector, but some of the anomalies previously seen by observers with the original QUIRC detector may have been due to this effect.

2.3Camera Sensitivity

The following sensitivity estimates are based on observations of 2 standard stars at the UH 2.2m telescope on 2/6/96. The Point SRC (source) and Mag/arcsec2 values are for 1 minute of on-source integration time, 5￿. The point source detection values below assume a PSF of 0.5 arcsec FWHM.

Table 2. QUIRC Sensitivity

UH 2.2m Telescope

Filter	Point SRC(Mag)	Mag/arcsec2	Jy/ADU (1 sec)
J	18.6	17.9	1.052e-6
H	17.8	17.1	8.295e-7
K	16.2	15.5	9.622e-7
H+K	18.6	17.9

2.3.1QUIST sensitivity

The following numbers are based on observations of standard stars using QUIST at the UH 0.6m telescope on 2/9/97. The Point SRC (source) and Mag/asec2 are for 1 minute of integration time, 5 sigma. The point source detection values below assume a PSF of 2.5 pixels FWHM.

Table 2. QUIRC Sensitivity on QUIST

Filter	Point SRC(Mag)	Mag/arcsec2	Jy/ADU (1 sec)
K’	14.5	16.4	7.644e-5
Hs	14.7	16.6	2.291e-4
Hl	14.3	16.2	2.391e-4
2.12	12.0	15.0	4.563e-6
2.26	12.7	15.5	1.412e-5

3 Setup and Observing with QUIRC

The nominal orientation for QUIRC at the 88-inch telescope is for the black electronics box on the dewar (the utility box) to point North (toward the control room). Then the resulting FITS data files written by the program have N up and E to the left (i.e. the (0,0) pixel is in the SE corner).