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Xiaofeng Li <lixf@gzhu.edu.cn> </td>
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Awaiting Agent
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Mac Intel OS11
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I'm interested in a weak source in BP252AF program. I used new antab file "VLBA_CBAND_GAINS.ANTAB", that provided on webpage https://science.nrao.edu/facilities/vlba/data-processing/vlb...
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<div>I'm interested in a weak source in BP252AF program. I used new antab file "VLBA_CBAND_GAINS.ANTAB", that provided on webpage https://science.nrao.edu/facilities/vlba/data-processing/vlba-7ghz-flux-density-scale, calibrated the amplitude of this observation data. When I load the calibrated data into difmap to do self-calibration, I found LA station show very large amplitude correction factors, i.e., 1.33, 1.28, 1.24 and 1.14. I have check other sources also show same problems. I don't know how to address this problem. Could you please give some suggestions to improve the calibration or self-calibration results.</div><div> The amplitude correction factors for 1241+16A and 1241+118 are similar for most telescope excepting SC that show significant difference.<br></div><div>Thanks very much!</div><div>Best Regards, </div><div><span style="font-size:1.125rem;"> Xiaofeng</span></div><div>------------------------------------</div><div>program code: BP252AF</div><div>observation date: 2022-07-22</div><div>frequency: 4.4, 7.6 GHz</div><div>interested source: 1241+16A (379mJy), 1241+118 (18.7 mJy)</div><div><br></div><div>gscale results for 1241+16A</div><div>Correcting IF 1.</div><div> Amplitude normalization factor in sub-array 1: 0.999293</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.99 FD 1.05 HN 0.96 LA 1.33 </div><div> MK 0.90 OV 0.89 PT 1.00* SC 0.88 </div><div>Correcting IF 2.</div><div> Amplitude normalization factor in sub-array 1: 1.01325</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.81 FD 1.00 HN 0.98 LA 1.28 </div><div> MK 0.95 OV 0.98 PT 1.00* SC 0.90 </div><div>Correcting IF 3.</div><div> Amplitude normalization factor in sub-array 1: 1.03733</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.87 FD 0.89 HN 0.97 LA 1.24 </div><div> MK 0.86 OV 0.94 PT 1.00* SC 0.93 </div><div>Correcting IF 4.</div><div> Amplitude normalization factor in sub-array 1: 1.07544</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.95 FD 0.87 HN 0.88 LA 1.14 </div><div> MK 0.82 OV 0.95 PT 1.00* SC 0.84 </div><div><br></div><div>scale results for 1241+118</div><div>Performing overall amplitude self-cal</div><div>Adding 1 model components to the UV plane model.</div><div>The established model now contains 1 components and 0.0179392 Jy</div><div>Correcting IF 1.</div><div> Amplitude normalization factor in sub-array 1: 0.978873</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.99 FD 1.01 HN 0.99 LA 1.31 </div><div> MK 0.96 OV 0.90 PT 1.00* SC 1.02 </div><div>Correcting IF 2.</div><div> Amplitude normalization factor in sub-array 1: 1.00021</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.87 FD 0.95 HN 0.98 LA 1.22 </div><div> MK 0.97 OV 0.99 PT 1.00* SC 1.02 </div><div>Correcting IF 3.</div><div> Amplitude normalization factor in sub-array 1: 1.02239</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 0.90 FD 0.83 HN 1.00 LA 1.21 </div><div> MK 0.89 OV 0.94 PT 1.00* SC 1.05 </div><div>Correcting IF 4.</div><div> Amplitude normalization factor in sub-array 1: 1.05514</div><div> Telescope amplitude corrections in sub-array 1:</div><div> BR 1.03 FD 0.88 HN 0.85 LA 1.16 </div><div> MK 0.83 OV 0.94 PT 1.00* SC 0.88 </div><div>Fit before self-cal, rms=0.008698Jy sigma=1.323204</div><div>Fit after self-cal, rms=0.007906Jy sigma=1.218094</div>
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