Discrete Sky Operator (DiSkO) Aperture Synthesis Radio Imaging
Discrete Sky Operator (DiSkO) Synthesis Imaging
Author: Tim Molteno firstname.lastname@example.org
Its so cool its POINTLESS. Image by using the telescope operator keeping track of the telescope null-space and range-space. This software carries out a sparsity reduction by regularization and controls the volume of the sky solution. The result is an imaging algorithm that is sensitive to diffuse broad sources, and does not require restoration like CLEAN. Publications to appear :)
disko --display --show-sources
To load a data from a measurement set
disko --ms test_data/test.ms --tikhonov --nside 32 --PDF
VLA imaging with DiSkO
Download the VLA 5GHZ continuum survey measurement set. AG733_A061209.xp1 from the NRAO site.
Calibrate and then split the measurement set, following the CASA tutorial [https://casaguides.nrao.edu/index.php/VLA_5_GHz_continuum_survey_of_Seyfert_galaxies]
disko --fov 0.01 --ms NGC1194.split.ms --SVG --arcmin 0.0025 --tikhonov
This tutorial should generate a file with lots of diffuse radiation. [https://casaguides.nrao.edu/index.php/VLA_Continuum_Tutorial_3C391-CASA5.5.0]
wget http://casa.nrao.edu/Data/EVLA/3C391/3c391_ctm_mosaic_10s_spw0.ms.tgz wget https://github.com/jaredcrossley/CASA-Guides-Script-Extractor/blob/master/extractCASAscript.py python extractCASAscript.py 'https://casaguides.nrao.edu/index.php?title=VLA_Continuum_Tutorial_3C391-CASA5.5.0'
Then in CASA
This should generate a suitable measurement set to image.
0.6.0b2 Use dask for very large jobs 0.6.0b1 Get data from Measurement Sets! 0.5.0b5 Allow sources not to be shown. 0.5.0b4 Override plot in HPSubSphere to allow for non-normal pixels. 0.5.0b3 Added elliptical source circle projections in SVG. 0.5.0 Getting imaging logic better. Added L2 regularization, and cross-validation
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