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GALEX Instrument
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Design/Performance Summary |
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Instrument Photo |
| Science Calibration Sample Data |
Design/Performance Summary
| Telescope Aperture | 50 cm | |||||||
| Optical Design | Modified Ritchey-Chretien with Aspheric corrected | |||||||
| Field of View | 1.2 degrees, circular | |||||||
| Focal Length | 3 m | |||||||
| Telescope coatings | Al+MgF2 | |||||||
| Imaging/Grism Modes | Optics wheel with (1) CaF2 Imaging window, (2) CaF2 transmission grism; (3) Opaque position. | |||||||
| Grism Rotation | Grism position angle may be selected with a resolution of 0.3 degrees. | |||||||
| Dichroic/Corrector |
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FUV Channel |
NUV Channel |
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| Beam path | Reflected from dichroic | Transmitted through dichroic | ||||||
| Filters | Blue edge filter (blocks OI, Ly a) - transmission | Red block filter/Fold mirror (blocks red Zodaical light) | ||||||
| Detectors | Sealed tubes with crossed delay-line anodes | |||||||
| Detector Window | MgF2 | Fused Silica | ||||||
| Detector Photocathode | CsI, opaque | CsTe, semitransparent | ||||||
| Detector peak QE | 12% | 8% | ||||||
| Detector maximum local countrate w/o saturation | 100 c/s | 100 c/s | ||||||
| System angular resolution | 5 arcsec (80% EE diam) 3.3 arcsec (FWHM) |
7.5 arcsec (80% EE diam) 5 arcsec (FWHM) |
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| Spectral Resolution | ~200 | ~100 | ||||||
| Imaging Effective Area | 25 cm2 | 44 cm2 | ||||||
| Spectroscopy Effective Area | 20 cm2 | 39 cm2 | ||||||
Instrument Photo
This photo shows the GALEX instrument in flight configuration (all thermal
blankets installed) prior to Thermal Vacuum testing.
Science Calibration Data
| Flat Field | Fine Linearity | Simulated Sky |
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| Scanned Simulated Sky | Relative Sensitivity | Grism calibration |
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