FUV Grating G130M with CENWAVE=1055 or 1096
Description
When used with a central wavelength of 1055 or 1096 Å, grating G130M samples wavelengths between about 900 and 1200 Å. Its resolution and effective area are higher than those of the G140L grating, but lower than those of G130M when used at longer central wavelengths.
Special Considerations
The COS sensitivity rises steeply between 1070 and 1150 Å. To observe bright targets near the Lyman limit, turn off detector Segment A and use only Segment B.
Grating | Resolving Power R = λ/Δλ | Dispersion (mÅ pixel−1) | Plate Scale (milliarcsec pixel−1) | FP-POS Step (Å step−1) | |
---|---|---|---|---|---|
Disp. Axis | Cross-Disp. Axis | ||||
G130M Segment A | 3,000–8,000 | 9.97 | 22.9 | 100 | 2.5 |
G130M Segment B | 5,000–12,000 | 9.97 | 22.9 | 100 | 2.5 |
Figure 13.8: Wavelength Ranges for the G130M/1055 and 1096 Modes.
G130M/1055 and 1096 Point-Source Sensitivity
Table 13.5: G130M/1055 and 1096 Point-Source Sensitivity for PSA.
Wavelength (Å) | Throughput | Sensitivity (counts pixel−1 sec−1 per erg cm−2 sec−1 Å−1) | Effective Area (cm2) |
---|---|---|---|
901 | 1.611e−04 | 3.3e+09 | 7.29e+00 |
950 | 4.736e−04 | 1.0e+10 | 2.14e+01 |
1000 | 2.709e−04 | 6.1e+09 | 1.23e+01 |
1050 | 6.355e−04 | 1.5e+10 | 2.87e+01 |
1100 | 5.538e−03 | 1.4e+11 | 2.51e+02 |
1150 | 3.076e−02 | 8.0e+11 | 1.39e+03 |
1200 | 4.216e−02 | 1.1e+12 | 1.91e+03 |
1237 | 4.389e−02 | 1.2e+12 | 1.99e+03 |
Figure 13.9: G130M/1055 and 1096 Point-Source Sensitivity for PSA.
G130M/1055 and 1096 Signal-to-Noise Ratio
Figure 13.10: Point-Source Signal-to-Noise as a Function of STMAG for G130M at 1030 Å.
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COS Instrument Handbook
- Acknowledgments
- Chapter 1: An Introduction to COS
-
Chapter 2: Special Considerations for Cycle 29
- • 2.1 COS FUV Detector Lifetime Positions
- • 2.2 Visit Length
- • 2.3 Central Wavelength Settings Added in Cycle 26
- • 2.4 The G285M Grating is Available but Unsupported
- • 2.5 COS Observations Below 1150 Angstroms: Resolution and Wavelength Calibration Issues
- • 2.6 Time-Dependent Sensitivity Changes
- • 2.7 Spectroscopic Use of the Bright Object Aperture
- • 2.8 Non-Optimal Observing Scenarios
- • 2.9 NUV Spectroscopic Acquisitions
- • 2.10 SNAP, TOO, and Unpredictable Source Programs with COS
- • 2.11 Choosing between COS and STIS
- Chapter 3: Description and Performance of the COS Optics
- Chapter 4: Description and Performance of the COS Detectors
-
Chapter 5: Spectroscopy with COS
- • 5.1 The Capabilities of COS
- • 5.2 TIME-TAG vs. ACCUM Mode
- • 5.3 Valid Exposure Times
- • 5.4 Estimating the BUFFER-TIME in TIME-TAG Mode
- • 5.5 Spanning the Gap with Multiple CENWAVE Settings
- • 5.6 FUV Single-Segment Observations
- • 5.7 Internal Wavelength Calibration Exposures
- • 5.8 Fixed-Pattern Noise
- • 5.9 COS Spectroscopy of Extended Sources
- • 5.10 Wavelength Settings and Ranges
- Chapter 6: Imaging with COS
- Chapter 7: Exposure-Time Calculator - ETC
-
Chapter 8: Target Acquisitions
- • 8.1 Introduction
- • 8.2 Target Acquisition Overview
- • 8.3 ACQ SEARCH Acquisition Mode
- • 8.4 ACQ IMAGE Acquisition Mode
- • 8.5 ACQ PEAKXD Acquisition Mode
- • 8.6 ACQ PEAKD Acquisition Mode
- • 8.7 Exposure Times
- • 8.8 Centering Accuracy and Data Quality
- • 8.9 Recommended Parameters for all COS TA Modes
- • 8.10 Special Cases
- Chapter 9: Scheduling Observations
- Chapter 10: Bright-Object Protection
- Chapter 11: Data Products and Data Reduction
-
Chapter 12: The COS Calibration Program
- • 12.1 Introduction
- • 12.2 Ground Testing and Calibration
- • 12.3 SMOV4 Testing and Calibration
- • 12.4 COS Monitoring Programs
- • 12.5 Cycle 17 Calibration Program
- • 12.6 Cycle 18 Calibration Program
- • 12.7 Cycle 19 Calibration Program
- • 12.8 Cycle 20 Calibration Program
- • 12.9 Cycle 21 Calibration Program
- • 12.10 Cycle 22 Calibration Program
- • 12.11 Cycle 23 Calibration Program
- • 12.12 Cycle 24 Calibration Program
- • 12.13 Cycle 25 Calibration Program
- • 12.14 Cycle 26 Calibration Program
- • 12.15 Cycle 27 Calibration Program
- • 12.16 Cycle 28 Calibration Program
- Chapter 13: Spectroscopic Reference Material
- • Glossary