Open Access
Table C.2.
VLT/FORS2 instrument parameters for S/N calculations.
| Parameter | E2V | E2V | MIT | MIT |
|---|---|---|---|---|
| 200 kHz | 100 kHz | 200 kHz | 100 kHz | |
| Readout Noise [e−] | 5 | 3 | 2.7 | 2.9 |
| Gain [e−/ADU] | 2.24 | 0.55 | 1.25 | 0.7 |
| Quantum Efficiency (V) | 85% | 85% | 70% | 70% |
| Dark Current [e−/pix/s] | 0.001 | |||
| Pixel Size | 15 μm (0.25″ unbinned) | |||
| Binning | 2×2 | |||
| Focal Length | 25,666 mm | |||
| Aperture Diameter | 8,200 mm | |||
| System Efficiency | 80% | |||
| Extinction (V-band) | 0.144 mag | |||
| Exposure Time | 300 s | |||
| Seeing FWHM | 0.8″ | |||
Notes. Values for E2V and MIT CCDs differ in quantum efficiency and readout noise. All calculations use 2×2 binning, 300 s V-band exposures, and 0.8″ seeing (FWHM).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.