ETC Request ID: STIS.sp.1011771
Exposure time (seconds) = 1,151.0000 at wavelength 3125.47 Å
gives: SNR = 3.4242 (per resolution element)
Table of Source and Noise Counts per Pixel
| Detailed Information | Count rate | Total counts | Associated noise |
| (counts/s) | (counts) | (counts) | |
| Counts (box 7 pixels high) | (1 pix x 7 pix) | (2 pix resel x 7 pix) | |
| Source | 0.010 | 23.69 | 4.87 |
| Background | 0.011 | 24.18 | 4.92 |
| Sky | 2.285e-06 | 5.26e-03 | 0.07 |
| Dark Current | 0.011 | 24.17 | 4.92 |
| Total in selected region | 0.021 | 47.87 | 6.92 |
| Brightest Pixel (single exposure) (at 2273.60 Å) | 0.048 | 55.08 | |
| Count rate entire detector | 1,605.004 | ||
| Buffer Time (sec) | 1,246.10 | ||
| For APT purposes, the recommended buffer time should be 4/5 of the buffer time calculated above. Please refer to the STIS Instrument Handbook for more details. | |||
|
|
|||
| Global Count Rates | |||
| Source only | 30.397 | 34,987.328 | |
| Background (sky+dark) | 1,574.606 | 1,812,371.99 | |
| Encircled energy fraction | 0.87 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | |
| Grating: | [G230L] R ~ 500 |
| Aperture: | 52X0.2 |
| Target: [point source] | |
| Spectrum: | Non-stellar Objects QSO (FOS based) [100, 3387 Å z=0] |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.051 applied before normalization |
| Normalization: | Renormalized to abmag = 18.941 in filter Sloan/U |
| Redshift: | z=0.871 |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 25.2
