ETC Request ID: STIS.sp.825090
Exposure time (seconds) = 2,500.0000 at wavelength 1235.00 Å
gives: SNR = 1.8528 (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 pix) | (2.0 pix resel x pix) | |
| Source | 0.001 | 6.30 | 2.51 |
| Background | 0.001 | 5.25 | 2.29 |
| Sky | 1.390e-12 | 6.95e-09 | 8.34e-05 |
| Dark Current | 0.001 | 5.25 | 2.29 |
| Total in selected region | 0.002 | 11.55 | 3.40 |
| Brightest Pixel (single exposure) (at 1220.60 Å) | 0.026 | 64.95 | |
| Count rate entire detector | 249.445 | ||
| Buffer Time (sec) | 8,017.81 | ||
| 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. | |||
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| Global Count Rates | |||
| Source only | 14.976 | 37,438.867 | |
| Background (sky+dark) | 234.469 | 586,172.65 | |
| Encircled energy fraction | 0.77 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | FUVMAMA |
| Central Wavelength: | 1222 |
| Grating: | [G140M] R ~ 10000 |
| Aperture: | 52X0.2 |
| Glow region: | low |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: m87_spec.dat |
| Extinction E(B-V): | None |
| Normalization: | None |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 24.2
