History / Experiments Improving the u-v coverage



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  • History / Experiments

  • Improving the u-v coverage

  • Quickest possible summary of papers

  • Calibration Results


  • Svetloe Zelenchukskaya Badary

  • movie: www.ipa.nw.ru/PAGE/ENG/film/film.htm

  • 1st EVN experiments = EK028A-C (Oct’08)

  • Officially joined EVN in Nov’09

  • Regular user experiments since Mar’10 session



EVN user experiments with at least one KVAZAR station

  • EVN user experiments with at least one KVAZAR station

    • Abandoned experiments not counted (5 total)
    • Half-integral = one band of multi-band (RadioAstron) obs
    • Target-of-opportunity & out-of-session included (12 total)




3 declinations (65, 35, 05)

  • 3 declinations (65, 35, 05)

  • 3 bands (6cm, 3.6cm, 1.3cm)

  • u-v coverage plots for 12-hr observations

    • With & without the KVAZAR stations (highlighted in red)
    • 24-hr for the low-declination case (3.6cm, no Wb)








in refereed journals only (no conferences, no arXiv)

  • in refereed journals only (no conferences, no arXiv)

  • Culled from the JIVE Biennial reports

    • Appendix “Publications based on EVN data”
    • Separate columns for some observations KVAZARs can’t do (yet)
      • This categorization done “by eye” (from the title, from prior knowledge,….)
      • Also excluded the papers based on global 7mm observations without a separate column
    • 2013-4 from ADS private library started to collect EVN pubs
    • Did not read through these to confirm KVAZR participation
    • Characteristic of VLBI papers: long latency after observation


Self-cal in pipeline (NMEs + user experiments) provides amplitude-gain corrections (AGC) per source

  • Self-cal in pipeline (NMEs + user experiments) provides amplitude-gain corrections (AGC) per source

  • Median AGC compiled per EVN session

  • Table 1: analog back-end (pre-R1002)

    • Station Order = Sv/Zc/Bd; tabulated median-AGC = x100


Table 2: digital back-end (R1002)

  • Table 2: digital back-end (R1002)

    • Station Order = Sv/Zc/Bd; tabulated median-AGC = x100
    • Clearly bad IFs excised (6cm Sv RCP [2/13], warm LCP [3/13])




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