ASTROSAT Soft X-ray imaging Telescope (SXT):
Click to download SXT description paper SXT Poster
The soft X-ray telescope on ASTROSAT will employ focussing optics and a deep depletion CCD camera at the focal plane to perform X-ray imaging in 0.3-8.0 keV band. The optics will consist of 41 concentric shells of gold-coated conical foil mirrors in an approximate Wolter-I configuration. The focal plane CCD camera will be very similar to that flown on SWIFT XRT. The CCD will be operated at a temperature of about -80oC by thermoelectric cooling.
The main characteristics of the SXT will be as follows:
| Telescope length: |
2465 mm
(including baffle, door and camera)
|
| Focal Length: | 2000 mm |
| Telescope PSF: | 1.5 - 2.5 arcmin (rms) |
| Field of View: | 41.3 x 41.3 arcmin |
| Energy range: | 0.3-8.0 keV |
| Detector: |
E2V CCD-22
(Frame Store)
|
| Detector Format: | 600x600 pixels |
| Pixel Scale: | 4.13 arc sec/pixel |
| CCD Readout modes: | Photon Counting, Imaging, Timing |
| Effective Area: |
200 cm2 @ 1.5 keV
(See figure below)
|
| Position accuracy: | 30 arc sec |
| Sensitivity expected: |
10 micro Crab
or better
|
Outer structure of the SXT is as shown in above figure
The effective area of the SXT as a function of photon energy is displayed below:
