MK013B

General information

• Session info: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/
• PI: Kim
• Targets: M87
• Stations: VLBA with GBT, EVN Ef Mh Pv, KVN Kt Ku Ky, GLT; not observed by On and Ys
• Phased arrays: ALMA, NOEMA
• Station feedback: https://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/sessions/apr21/feedback_apr21.asc
• Mixed-polarization baselines to ALMA were polconverted to circular using APP QA2 package:
  MK013B_M87_a_03_TM1-20210614.APP_DELIVERABLES.tgz
• The final FITS-IDI and HOPS data releases are correlation rev1 polconversion v1
• The included ANTAB files are as provided by the stations, and that of ALMA was generated by PolConvert

Status

Fringes

Notes

ALMA tuning was incorrect by an integer 3 MHz.

Baselines to ALMA have a relatively high residual fringe rate. This should be addressed in AIPS/CASA postprocessing. Origin unclear. Coordinates for ALMA correct.

ALMA VLBI baselines were polconverted using DiFX 2.7.1 PolConvert and the APP QA2 package MK013B_M87_a_03_TM1-20210614.APP_DELIVERABLES.tgz.

The ALMA ANTAB data are as generated by PolConvert for each 64 MHz band.

The experiment was correlated in DiFX in two parts to get a 64 MHz FITS-IDI IF bandwidth:

• Scans without ALMA were correlated under DiFX 2.6.2, using 64 MHz zoom bands
• Scans where ALMA participated i.e. No0031--No0079 except No0056 and No0072 (ALMA: 62.5 MHz recordings) were correlated under DiFX 2.7.0 (equiv. to DiFX 2.7.1) and the "outputbands" feature synthesized 64 MHz wide bands
• The two (sub)correlations were merged into correlation rev1

Post-Correlation checks