IRAC-2b on the ESO/MPI 2.2m Telescope

2p2-m Telescope

IRAC-2b on the ESO/MPI 2.2m Telescope

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General Description Documentation - Manual, Reports and Calibration Instrument Performance Array Characteristics Filters and Objectives

General Desciption back to top IRAC2b was ESO's 1 to 2.5 micron imager on the ESO 2.2m telescope until July 1998. It was equipped with a 256x256 NICMOS-3 array. Imaging could be done through the standard J, H and K broadband filters, a special K' filter and several narrow band filters. IRAC2b also had a warm Fabry Perot coated for the 2 to 2.5 micon range with a resolving power of 1000. Imaging could be done through four different objectives with scales ranging from 0.15 to 0.71 arc seconds per pixel. Documentation back to top IRAC2b Users Manual Data Reduction, Calibration Frames and Archive Calibration Plan IRAC2b Technical Reports Bad Pixel Map Observing Logs - 2 formats. Normal Spacing --- IRAC2_OL.ps.gz (1.8 kb) Double Spacing --- IRAC2_OL.fat.ps.gz (1.6 kb) Problems and Solution Page - PostScript File. Version: April, 1997. Instrument Performance back to top Filter Zero Point Typical Backgrounds (Magnitudes/sq. arc-sec.) J 21.80 15.0 - 16.5 H 21.64 12.8 - 14.3 K 21.10 11.2 - 13.0 K' 21.01 12.0 - 13.5 The Zero-Points are a function of the lens used, the cleanliness of the mirror, the read-out method. The values reported above were obtained during March, 1997. The lens was LC and the read-out method was NDR (Non-Destructive Read). Array Characteristics back to top Detector Material HgCdTe Pixel Size 40 microns Number of Elements 256 x 256 Quantum Efficiency 40% at 1.2 microns, 60% at 2.2 microns Well Depth 100,000 electrons Read Out Noise (Double Correlated Read) 46 electrons Gain(Double Correlated Read) 6.6 electrons/ADU Filters and Objectives back to top Filter (microns) Delta (microns) ZPs Sky Background J 1.25 0.30 21.80 15.0-16.5 H 1.65 0.30 21.64 12.8-14.3 K 2.2 0.40 21.10 11.2-13.0 K' 2.15 0.32 21.01 12.0-13.5 BP1(FeII) 1.262 0.04 20.15 16.7 BP2(FeII) 1.645 0.04 19.57 14.2 BP3(HeI) 2.058 0.036 18.55 13.8 BP4 2.105 0.037 18.80 14.3 BP5(H2) 2.121 0.039 18.85 14.1 BP6 2.136 0.038 18.79 14.0 BP7 2.148 0.037 18.74 13.9 BP8(BR-gamma) 2.164 0.037 18.74 13.7 BP9 2.177 0.038 18.74 13.6 BP10(CO-continuum) 2.216 0.075 19.00 13.3 BP11(CO) 2.365 0.088 18.83 11.9 Fabry-Perot at 2.136 + BP6 2.0 to 2.5 0.0016 15.32 12.4 To get the ascii file of the transmission curve, click on the wavelength. The ZPs (DCR) for the broadband filters were measured during March, 1997. The ZPs (DCR) for the narrow band filters and the FP were measured during August, 1996. During this time, the external temperature was near zero, so backgrounds were low. More realistic backgrounds will be 0.5 magnitudes brighter. Internal reflections have been detected for BP2, BP10 and BP11. Lens Scale (arc-seconds per pixel) Field of View (arc-seconds) LA 0.151 38 x 38 LB 0.278 71 x 71 LC 0.507 129 x 129 LD 0.708 A disc of diameter 180 LE 1.061 A disc of diameter 180 Lens LE is not recommended for general use. Pictures Picture 1 Picture 2

Filter	Zero Point	Typical Backgrounds (Magnitudes/sq. arc-sec.)
J	21.80	15.0 - 16.5
H	21.64	12.8 - 14.3
K	21.10	11.2 - 13.0
K'	21.01	12.0 - 13.5

Detector Material	HgCdTe
Pixel Size	40 microns
Number of Elements	256 x 256
Quantum Efficiency	40% at 1.2 microns, 60% at 2.2 microns
Well Depth	100,000 electrons
Read Out Noise (Double Correlated Read)	46 electrons
Gain(Double Correlated Read)	6.6 electrons/ADU

Filter	(microns)	Delta (microns)	ZPs	Sky Background
J	1.25	0.30	21.80	15.0-16.5
H	1.65	0.30	21.64	12.8-14.3
K	2.2	0.40	21.10	11.2-13.0
K'	2.15	0.32	21.01	12.0-13.5
BP1(FeII)	1.262	0.04	20.15	16.7
BP2(FeII)	1.645	0.04	19.57	14.2
BP3(HeI)	2.058	0.036	18.55	13.8
BP4	2.105	0.037	18.80	14.3
BP5(H2)	2.121	0.039	18.85	14.1
BP6	2.136	0.038	18.79	14.0
BP7	2.148	0.037	18.74	13.9
BP8(BR-gamma)	2.164	0.037	18.74	13.7
BP9	2.177	0.038	18.74	13.6
BP10(CO-continuum)	2.216	0.075	19.00	13.3
BP11(CO)	2.365	0.088	18.83	11.9
Fabry-Perot at 2.136 + BP6	2.0 to 2.5	0.0016	15.32	12.4

Lens	Scale (arc-seconds per pixel)	Field of View (arc-seconds)
LA	0.151	38 x 38
LB	0.278	71 x 71
LC	0.507	129 x 129
LD	0.708	A disc of diameter 180
LE	1.061	A disc of diameter 180

2p2-m Telescope IRAC-2b on the ESO/MPI 2.2m Telescope

General Desciption

Documentation

Instrument Performance

Array Characteristics

Filters and Objectives

Pictures

2p2-m Telescope

IRAC-2b on the ESO/MPI 2.2m Telescope