5 Synthesis Imaging

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Chapter 5
Synthesis Imaging

Inside the Toolkit:

The im tool handles synthesis imaging operations.

This chapter describes how to make and deconvolve images starting from calibrated interferometric data, possibly supplemented with single-dish data or an image made from single-dish data. This data must be available in CASA (see § 2 on importing data). See § 4 for information on calibrating synthesis data. In the following sections, the user will learn how to make various types of images from synthesis data, reconstruct images of the sky using the available deconvolution techniques, include single-dish information in the imaging process, and to prepare to use the results of imaging for improvement of the calibration process (“self-calibration”).

5.1 Imaging Tasks Overview
5.2 Common Imaging Task Parameters
  5.2.1 Parameter cell
  5.2.2 Parameter field
  5.2.3 Parameter imagename
  5.2.4 Parameter imsize
  5.2.5 Parameter mode
  5.2.6 Parameter phasecenter
  5.2.7 Parameter restfreq
  5.2.8 Parameter spw
  5.2.9 Parameter stokes
  5.2.10 Parameter uvtaper
  5.2.11 Parameter weighting
  5.2.12 Parameter vis
  5.2.13 Primary beams in imaging
5.3 Deconvolution using CLEAN (clean)
  5.3.1 Parameter psfmode
  5.3.2 The multiscale parameter
  5.3.3 Parameter gain
  5.3.4 Parameter imagermode
  5.3.5 Parameter interactive
  5.3.6 Parameter mask
  5.3.7 Parameter minpb
  5.3.8 Parameter modelimage
  5.3.9 Parameter niter
  5.3.10 Parameter pbcor
  5.3.11 Parameter restoringbeam
  5.3.12 Parameter threshold
  5.3.13 Parameter gridmode
  5.3.14 Interactive Cleaning — Example
  5.3.15 Mosaic imaging
  5.3.16 Heterogeneous imaging
  5.3.17 Polarization imaging
  5.3.18 Wide-field imaging and deconvolution in clean
5.4 Primary Beam Correction (impbcor)
5.5 Combined Single Dish and Interferometric Imaging (feather)
5.6 Making Deconvolution Masks or Box Regions
  5.6.1 Making Deconvolution Regions from an Image (boxit)
5.7 Insert an Image Model (ft)
5.8 Image-plane deconvolution (deconvolve)
5.9 Self-Calibration
5.10 Examples of Imaging

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Chapter 5Synthesis Imaging

Chapter 5
Synthesis Imaging