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- Miriad for SWARM data & Imaging techniques
2016-05-09 Cyber-telecom meeting at HST 9:00am, PDT 12:00pm, MDT 1:00pm and EDT 3:00pm
Agenda:
- Issue 1 - Review of previous meetings in 2015 Fall/2016 Spring semesters
- Issue 2 - A guide for using Miriad with 32 bits integer type Miriad-SWARM 3.2.4 and newer version
- The issue of 32 bits integer
Miriad is running into a limit
in data index for handling a large volume of data produced from the SWARM correlator with
the default integer type (32bits) used in Miriad Fortran routines;
while upgrading Miriad to 64bit integer type, here is a guide for users to detour the 32bits integer issue:
- Pre-process 1 (SMA Technical Memo #162)
- Glen Petitpas' pipeline for data analysis and quality assurance -
for ASIC data -
swarmsplt vis=smalodedArchive.data out=asic.uv options=asic
for SWARM data (two quadriants, full spectral resolution) -
Option 1 -
swarmsplt vis=smalodedArchive.data out=swarm.uv options=swarm line=channel,32768,1,2
smacheck vis=swarm.uv var=systemp
smavarplt vis=swarm.uv device=/xs axis=time yaxis=systemp nxy=2,4
uvlist vis=swarm.uv options=full,var
Option 2 -
Loop i =1, 2, 3, 4
swarmsplt vis=smalodedArchive.data out=sw_i.uv options=swi
smacheck vis=sw_i.uv var=systemp
smavarplt vis=sw_i.uv device=/xs axis=time yaxis=systemp nxy=2,4
uvlist vis=sw_i.uv options=full,var
Loop end
Continuum and broad-line systems -
for two quadriants full spectral resolution SWARM data -
swarmsplt vis=smalodedArchive.data out=swarm.uv options=swarm line = channel,32768,1,2
for four quadriants full spectral resolution SWARM data -
swarmsplt vis=smalodedArchive.data out=swarm.uv options=swarm line = channel,65536,1,2
Narrow-line systems -
the full spectral resolution is not an issue
If the line is covered in the i-th swarm chunk, say i=4 -
swarmsplt vis=smalodedArchive.data out=swarm4.uv options=sw4
Issue 3 - Data random errors & ad hoc repair
- 151226_04:17:44, marred by several overflow data points
- 160115_03:45:42, failed eight ASIC chunks (s21 - s28)
- 160418_07:13:17, corrupted data scans at end of the file
Issue 4 - A demo for processing high-spectral resolution data and fixing ad hoc data problems
- CO line from a brown dwarf, a narrow line system: 151226_04:17:44 -
Issue 5 - Questions and Answers for SMA users
Handling SMA Data Miriad -
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Calibrations,
imaging for continuum and spectral lines in general
Imaging facility for submillimter and radio astronomy -
- Miriad - providing UVFITS for imaging elsewhere
- CASA
- AIPS
Issue 6 - Development of New Imaging Technology
Imaging technology from interdisciplines-
physicis, nanoscience, biology and etc.
Imaging algorithms & procedures -
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