Category:LowFrequency: Difference between revisions
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(Created page with "= Low Frequency Observing (L, S, C) = == Current->Revised OSS Guidelines == * Sensitivity ** L band: 420 (RMS confusion level: 89) ** S band: 370 (RMS confusion level: 14) ** C...") |
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* Calibration and Flux Density Scale | * Calibration and Flux Density Scale | ||
** LOOK AT THE NVSS | |||
** Accurate flux densities can be obtained by observing one of 3C286, 3C147, 3C48 or 3C138 during the observing run. Not all of these are suitable for every observing band and configuration – consult the VLA Calibrator Manual for advice. Over the last several years, we have implemented accurate source models directly in AIPS and CASA for much improved calibration of the amplitude scales. Models are available for 3C48, 3C138, 3C147, and 3C286 for L, C, X, Ku, K, and Q bands. At Ka band either of the K or Q band models works reasonably well. | ** Accurate flux densities can be obtained by observing one of 3C286, 3C147, 3C48 or 3C138 during the observing run. Not all of these are suitable for every observing band and configuration – consult the VLA Calibrator Manual for advice. Over the last several years, we have implemented accurate source models directly in AIPS and CASA for much improved calibration of the amplitude scales. Models are available for 3C48, 3C138, 3C147, and 3C286 for L, C, X, Ku, K, and Q bands. At Ka band either of the K or Q band models works reasonably well. | ||
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* General Guidelines for Gain Calibration | * General Guidelines for Gain Calibration | ||
** If your target object has sufficient flux density to permit phase self-calibration, there is no need to calibrate more than once hourly at low frequencies (L/S/C bands) or 15 minutes at high frequencies (K/Ka/Q bands) in order to track pointing or other effects that might influence the amplitude scale. | ** If your target object has sufficient flux density to permit phase self-calibration, there is no need to calibrate more than once hourly at low frequencies (L/S/C bands) or 15 minutes at high frequencies (K/Ka/Q bands) in order to track pointing or other effects that might influence the amplitude scale. | ||
== Detailed Guidelines == | == Detailed Guidelines == | ||
Revision as of 20:16, 15 December 2010
Low Frequency Observing (L, S, C)
Current->Revised OSS Guidelines
- Sensitivity
- L band: 420 (RMS confusion level: 89)
- S band: 370 (RMS confusion level: 14)
- C band: 310 (RMS confusion level: 2.3)
- EVLA Frequency Bands and Tunability
- No special notes
- Calibration and Flux Density Scale
- LOOK AT THE NVSS
- Accurate flux densities can be obtained by observing one of 3C286, 3C147, 3C48 or 3C138 during the observing run. Not all of these are suitable for every observing band and configuration – consult the VLA Calibrator Manual for advice. Over the last several years, we have implemented accurate source models directly in AIPS and CASA for much improved calibration of the amplitude scales. Models are available for 3C48, 3C138, 3C147, and 3C286 for L, C, X, Ku, K, and Q bands. At Ka band either of the K or Q band models works reasonably well.
Note: Must update OSS Flux densities of Standard Calibrators; need S band fluxes.
- General Guidelines for Gain Calibration
- If your target object has sufficient flux density to permit phase self-calibration, there is no need to calibrate more than once hourly at low frequencies (L/S/C bands) or 15 minutes at high frequencies (K/Ka/Q bands) in order to track pointing or other effects that might influence the amplitude scale.
Detailed Guidelines
Observing Preparation Recommendations
Scheduling
Calibration Strategy
Known RFI
Calibrator Catalog and Selection
Monitoring Observations
Post-processing Guidelines
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