Instrument's Characteristics
In this page are listed the main characteristics of the imaging mode
and the filters of the instrument.
This is intented as a quick
reference. A detailled description of HAWK-I can be found in the user's manual
Imaging mode: characteristics and sensitivity
The detectors
HAWK-I Detectors definition
|
Characteristics of the four detectors
| Detector Parameter |
|
Q1 |
Q2 |
Q3 |
Q4 |
| Detector numbering |
|
#66 |
#78 |
#79 |
#88 |
| Gain [e-/ADU] |
|
1.705 |
1.870 |
1.735 |
2.110 |
| Operating temperature |
|
75K, controlled to 1mK |
| Dark current [e-/s] (at 75K) |
|
between 0.10 & 0.15 |
| Read noise* (DCR) |
|
~ 12 e- |
| Read noise* (NDR) |
|
~ 5 e- |
| Linear range (1%) |
|
60.000e- (~30.000 ADUs) |
| Saturation level |
|
between 40.000 & 50.000 ADUs |
|
*: The RON depends on the number of non-destructive samples during the integration.
DCR (Double-Correlated Read) refers to two samples, i.e. minimum DIT ~ 1.25s.
NDR (Non-Destructive Read) refers to > 10 samples, i.e. DIT > 10s
The gap
There is a small mis-alignmment between the detectors. Quadrants 2,3 &4 are tilted with respect to quadrant 1 by 0.04, 0.03 & 0.13 degrees respectively.
Details of the gap between detectors
List of filters offered for HAWK-I
Click on the filter name to retrieve the transmission curve
| Filter Name |
Central Wavelength (μm) |
Width (μm) |
Transmission (%) |
| Y |
1.021 |
0.101 |
92 |
| J |
1.258 |
0.154 |
88 |
| H |
1.620 |
0.289 |
95 |
| Ks (1) |
2.146 |
0.324 |
82 |
| Ks (2) |
2.146 |
0.324 |
82 |
|
|
| CH4 |
1.575 |
0.112 |
90 |
| H2 |
2.124 |
0.030 |
90 |
| Brγ |
2.165 |
0.030 |
77 |
|
|
| NB1060 |
1.061 |
0.009 |
70 |
| NB1190 |
1.186 |
0.012 |
75 |
| NB2090 |
2.095 |
0.020 |
81 |
(1) Filter used from Aug 2007 until Dec 3, 2007. Showed some structure for the Nov 2007 Science Verification run.
(2) New Ks filter, used starting Jan 2008.
|
|
|
Plot of filters efficiency
|
