Time -

• Time: January 20, 2022 at 2-3 pm EST

Cyber link -

• Meeting room ?
• ID: ?
• PW: ?
• Host: Beth Sargent

Agenda -

• Introduction -
Beth:
• 1. Any issues on using CASA
  • Installation of CASA from NRAO
  • Any issues ? (version? on MacOS ? or on Linux ?)
  
  
  • Questions on IRAS17439imInspec.py?
  • review it (image inspecting tools); skip if no questions.
• 2. Questions regarding the filler observing program
  • Primary for observing CO(3-2)?
  • Upper sideband (USB)
  • There were 48 spw for each sideband; which sideband was tuned for the CO line?
  • May get the observing script from Nimesh, if you don't have it
  According to the head of the ms data, Patel was the observer
JHZ:
• 3. Inspecting SMA measurementSets -
• 3.1. Demo data:
SMA measurementSets calibrated and exported from MIR/IDL (Nimesh)
Single source formatted for two observing dates -
• 2015-4-18 (d1):
IRAS_17439_usb.ms
J174546_usb.ms
SCHB_145_usb.ms
V4561_SGR_usb.ms


• 2015-4-21 (d2):
IRAS_17439_tr2_usb.ms
J174546_tr2__usb.ms
SCHB_145_tr2_usb.ms
V4561_SGR_tr2_usb.ms


• 3.2. Items of examing the calibrated SMA data:
• uv-coverage
• visibility weighting
• amplitude-phase alignment (for MFS continuum)
• on-line Doppler tracking?
• managing to combine two-epoch data for imaging?
• 2. SMA ms uv-data inspection -
• CASA python script
• CASA tasks & various issues -
LISTOBS -
• listlobs log: IRAS_17439_usb_d1.ms
• listlobs log: IRAS_17439_usb_d2.ms
ISSUES -
1. missing project code

2. different correlator configurations between d1 and d2 observing tracks
d1: 48 asic correlator chunks (BW: 104 MHz each)
d2: 48 asic correlator chunks (BW: 104 MHz each) + 2 swarm chunks (BW: 1.248 GHz)
3. The sky frequency offset: 80 MHz between d1 (2015-4-18) and d2 (2015-4-21)


SPLIT -
PURPOSE -
1. to make asic data only from the hybrid correlator data on d2.

PLOTMS -
PURPOSE -
1. Examine UV-coverage.










Fig. 1: Left is the d1 track and right for d2.

PLOTMS -
PURPOSE -
1. Examine UV-coverage.
ISSUES -
1. d1 amplitude issue (check Tsys or weight)
2. poor phase on both d1 and d2, no source clearly detected in the UV domain











Fig. 2: Left is the d1 spectra of 48 spw and right for d2.

PLOTMS -
PURPOSE -
1. Examine UV-weight.
ISSUES -
1. d1 amplitude issue (check Tsys or weight)
2. poor phase on both d1 and d2, no source clearly detected in the UV domain

















Fig. 3: Upper-left is the d1 wt as function of time and upper-right for d2. Bottom-left is the d1 wt as function of time and bottom-right for d2.

PLOTMS, tCLEAN & VIEWER -
PURPOSE -
1. GUI editing vis data and construct continuum images.
2. View images and make statistics.
ISSUES -
1. rms noise of d1 data is 3-4 times higher than that of d2















Fig. 4: Left is the d1 continuum image (rms~22 mJy/B) and right for d2 (rms~5.2 mJy/B). FWHM = 3" x 1"
• 3. Python script & reduce other dataset -
• 3.1 IRAS17439msInspec.py
Review it -

• module 0: a summary of tasks
• module 1: inspect ms header
• module 2: split hybrid asic+sawrm into asic spectal configuration
• module 3: plot uv-coverage
• module 4: plot & inspect 48-spw spectrum
• module 5: inspect weights
• module 6: editing vis & imaging continuum of d1
• module 7: editing vis & imaging continuum of d2
• 3.2 Reduce other sources' data (ms)

Demo: on rtdc9 for SCHB_145 -


• share screen
• login to RTDC9
• goto /reduction/jzhao/SMA2CASA_TESTING/Users/BethSargent/
mkdir SCHB145

cp -r ../NPatel/bethSargentFiller2015/18Apr2015/casaMS/SCHB_145_usb.ms SCHB145/SCHB_145_usb_d1.ms

cp -r ../NPatel/bethSargentFiller2015/21Apr2015/casaMS/SCHB_145_tr2_usb.ms SCHB145/SCHB_145_usb_d2.ms

cd SCHB145

cp ../SCHB145/SCHB145msInspecting.py SCHB145msInspecting.py


• lines 52-52: change 'IRAS_17439' to 'SCHB_145'
• start casa (5.8)
• casa <1>: run SCHB145msInspecting.py

Issue -
• the CO line chunk? -
• Beth: makes a request to Nimesh for the observing program or giving the chunk number for the CO line.
Plan for next meeting -
• imaging the CO cube -
• Jun-Hui: will work out the python script for constructing CO line cube.