VLA Archive file 22B-193.sb43002594.eb43209206.59943.66960916667

[eacmills]

SB 43002594 JACKS region 8

• [x] Observations completed
• [x] VLA CASA Calibration pipeline run by observatory
• [x] Weblog downloaded and unpacked
• [ ] Raw data downloaded (specify where)
  • [ ] local machine
  • [ ] Globus
• [ ] Pipeline calibration assessment
• [ ] Calibrated MS generated
  • [ ] Uploaded to Globus
• [ ] Imaging: Continuum
• [ ] Imaging: Lines
  • [ ] NH3 (1,1)
  • [ ] NH3 (2,2)
  • [ ] NH3 (3,3)
  • [ ] NH3 (4,4)
  • [ ] NH3 (5,5)
  • [ ] H2O
  • [ ] H64
  • [ ] H66
  • [ ] NH3 (2,1)
  • [ ] NH3 (3,2)
  • [ ] NH3 (4,3)
  • [ ] NH3 (5,4)
  • [ ] NH3 (6,5)

    Product Links

[eacmills]

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Log Name: 2022-12-30_1604_22B-193 Project: 22B-193 SBID(s): 43002594 EBID(s): 43209206 Observing Date: 30-Dec-2022 Observation Type: Science Bands Used: X K No. Subarrays: 1 Observer(PI): Prof Elisabeth Mills Source File(s): 22B-193_sb43002594_1_1 Operator(s): Kenneth Gibson and Katie Grabowski Array Configuration: C Decommissioned Antenna: 12

Adobe PDF version of this log is located at: http://www.vla.nrao.edu/operators/logs/

WEATHER INFORMATION

Time(UTC) Dew Pt Temp Wind Bar Press API RMS Phase(degs) 30Dec 16:13:25 -0.1 0.1 SW at 5.8 m/s 785.7 4.7 30Dec 18:00:15 0.7 2.3 W at 3.1 m/s 785.7 16.7

Operator comments for the above weather entries

30Dec 16:13:25 Sky cover 40%. Cumuliform clouds. 30Dec 18:00:15 Sky cover 60%. Cumuliform clouds.

COMMENTS AND OUTAGES

Outage information format: Start Time, End Time, Category, Form#, # Antennas, Down Time(minutes) Antenna ID(s) and Data Effect Description

Number of Antennas Used: 27

30Dec 16:04:09 Starting project 22B-193.

30Dec 16:04:09 The band(s) used is(are): X K.

30Dec 16:07:56 On source 3C286 with all available antennas.

30Dec 16:04:09 To access your data from the NRAO archive visit: https://science.nrao.edu/facilities/vla/archive All VLA science data are processed through the VLA calibration pipeline. Details are at: https://science.nrao.edu/facilities/vla/data-processing/pipeline For further questions please use the NRAO Helpdesk at: https://science.nrao.edu/observing/helpdesk Adobe PDF version of this log is located at: http://www.vla.nrao.edu/operators/logs/

30Dec 16:04:09 Note: To support our ongoing RFI monitoring efforts, any feedback from your program on RFI can be sent to: nrao-rfi@nrao.edu The key information to provide is:

• Observation/project code
• Frequency and Time of the observations
• The characteristics of the RFI signal, in particular if it is continuous or intermittent?
• If possible, a spectrum of the RFI should be included in the e-mail. Thanks very much for your support; this information will be continuously updated on the EVLA science pages at: https://science.nrao.edu/facilities/vla/docs/manuals/obsguide/modes/rfi/

30Dec 16:04:09 Antennas in the C-array may be shadowed at low elevations. If shadowing occurs, sensitivity will be affected.

30Dec 16:04:09 30Dec 19:33:36 CRYOGENICS WO-15971 0.11 23.9 Antenna(s) 23 (Data: Corrupted): Antenna 23 X-band fringes weak due to receiver at ambient temperature.

30Dec 16:04:09 NOTE: A thin layer of snow is covering approximately 30% of each dish surface.

30Dec 16:04:09 30Dec 19:33:36 LO-IF WO-15975 0.50 104.7 Antenna(s) 26 (Data: Lost): Lost M-lock on 302-1. IFs A/C affected.

30Dec 19:05:57 30Dec 19:09:05 SERVO WO-15976 1.00 3.1 Antenna(s) 25 (Data: Lost): Antenna off source while servo SCR card reset.

Project End Time Total Time % Down Time Total Down Time (minutes x 27 ants) (minutes)

30-Dec-2022 19:33:36 5655.2 2.3% 131.7

[eacmills]

Issues noted by staff during pipeline run:

• Operator log indicates thicker clouds and API measurements increasing as the observation progressed, and there is clearlydecorrelation on the complex gain calibrator based on Amp vs. UVwave plots of calibrated data: this is primarily from scan='27,35\~65,69\~73'.

• ea10 has weights that are much higher than other antennas for spw='2\~5,12\~16,24\~30' for scan='31\~55.

• ea10 shows low and spread gain amplitude solutions for scan='8\~22'.

• ea28 shows some spws with lower gain amplitude solutions.

[d-l-walker]

Overall I think this is fine?

As noted above, ea10 does have some lower amplitudes in earlier scans, but nothing crazy:

The majority of antennas seem to have a pretty large phase spread. Probably just related to the weather, as noted above? E.g.:

[d-l-walker]

As noted in the operator log, there appears to have been decorrelation due to bad weather.

We discussed this during the previous telecon, and Walker noted that this is evident when looking at the flux of the phase calibrator (J1744) in stages 12 and 19 of the weblog. See the screenshot below and note the ~ 12% difference between the fluxes.

The operator notes that this is primarily from scans 27,35~65,69~73. I'm not sure if this can be calibrated out, or something that necessitates re-observation? @eacmills

[d-l-walker]

I had set the calibration and imaging running in the background. But I just checked and it had failed. It looks like I downloaded the wrong product version, which didn't have the visibilities included ... 🤦‍♂️

Re-downloading the correct version now.

[d-l-walker]

Initial continuum imaging has finished. I've added a quick comparison with some different datasets below.

Not a lot of structure in this region, though the sources that are seen match well with the MeerKAT image (green contours in all panels).