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AGN Monitoring Workshop MPIFR 14/15 March 2011

AGN Monitoring Workshop MPIFR 14/15 March 2011. Reduction and first results of F-GAMMA data. I. Nestoras on behalf of the F-GAMMA team. General information . Coordinated observations at Effelsberg and PV Typical 48h per session for Effelsberg / 12h for PV

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AGN Monitoring Workshop MPIFR 14/15 March 2011

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  1. AGN Monitoring Workshop MPIFR 14/15 March 2011 Reduction and first results of F-GAMMA data I. Nestoras on behalf of the F-GAMMA team

  2. General information • Coordinated observations at Effelsberg and PV • Typical 48h per session for Effelsberg / 12h for PV • Cross scans in Azi/Elv for Effelsberg • Wobbling / calibrated cross scans for PV • New system in Effelsberg (July 2010) • Change to EMIR receivers at IRAM (April 2009) • Observing at Horizontal / Vertical polarizations

  3. Effelsberg Observing Wavelengths : 11cm to 7mm (8 frequencies)‏ • Standard reduction procedures now semi-automatic (Code by E. Angelakis , A. Kraus)‏ • Gain Curve Correction • Opacity Correction • Pointing Corrections • Absolute calibration • (Calibrators: 3C 286,etc.)‏ • Accuracy ~ < 5% at high frequencies • (Angelakiset.al 2008)‏

  4. Effelsberg - Calibration

  5. Some results Light Curve of 0235+164 (BL LAC) Spectra of 0235+164 (BL LAC)

  6. Some results Spectra of 2251+158 (3C 454.3) (FSRQ) Light Curve of 2251+158 (3C 454.3) (FSRQ)

  7. IRAM - PV Observing Wavelengths : 3, 2, 1mm‏ • Reduction with Mira and IDL software • Averaging of sub-scans in Azi/Elv • Gain Curve Correction • Opacity Correction • Pointing Corrections • Absolute calibration • (Main calibrators Mars, Uranus)‏ • Average polarizations for EMIR • (Horizontal / Vertical) New receiver (EMIR) since May 2009 • Accuracy ~ < 10%

  8. IRAM – PV Flagging First/basic filter on the data : • changes of data format • remove data that had an ambiguous fit • negative values • remove first scan before focus for calibrators Second pass filter : • pointing offset • Remove all data for which • the pointing offset is larger than 0.35*HPBW‏ • fitting width • Remove all data for which • the width is larger than HPBW +- 0.45*HPBW • Third pass filter : • After averaging of sub-scans • apply again first and second filters

  9. IRAM – PV Error estimation • Propagated error with every operation • In every average operation also the scatter of the elements is added

  10. IRAM – PV Error estimation In more detail : • Fit error in every scan and direction (Azi/Elv) Initial error per direction • Scatter of measurements in each direction Propagated error per direction after pointing, opacity and gain curve correction Calibration error : The error in each calibration factor is the propagated error of each calibration measurement and the corresponding error in the assumed model. The final calibration factor is the average of all the available factors Final error : The propagated error after the sensitivity correction

  11. IRAM – PV Calibration

  12. IRAM – PV Calibration

  13. Effelsberg/IRAM Cross Calibration

  14. - 110mm 60mm 36mm 28mm 20mm 13mm 9mm 7mm 3mm 2mm % 93.5 96.8 93.5 93.5 98.3 94.2 91.1 80.8 81.5 40.7 Some results Percentage of variable sources per frequency

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