Image Analysis with CASA - ESO

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Preliminary remarks Several CLEAN parameters are used to control your resulting CLEANed image setup, Still they can be modified later on during Image Analysis: restfreq : Set the rest frequency reference of the cube outframe : Set the velocity reference frame (LSRK, BARY, TOPO, ...) veltype : (radio, optical) pbcor : primary beam correction (False/True) impbcor ALL image analysis can probably be done in your favorite software, here I focus on CASA I have selected “standard” parameters/options (heavily biased !!!) when illustrating CASA command Please Refer to CASA help, as I could not copy/paste all parameters/options here REFERENCES: CASA Cookbook CASA Guides (ALMA Science Portal/ALMA data/Science Verification/) 4
Working with images: General tasks Import / export images – importfits, exportfits View images – the Viewer Manipulate header information – imhead Define a box /region Extract values – imval Image statistics – imstat Perform mathematical operations on or between images – immath Regrid an image onto new coordinate system – imregrid Smooth images – imsmooth Source component fitting – imfit 5
Page 1 and 2: Image Analysis with CASA Sebastien
Page 3: View images Extract information fro
Page 7 and 8: Viewer CASA> viewer and then use th
Page 9 and 10: Header hdkey for reference beammaj
Page 11 and 12: Defining box / region - Command lin
Page 13 and 14: Image Statistics imstat : calculate
Page 15 and 16: Mathematical operations on images i
Page 17 and 18: Smooth images imsmooth - Image conv
Page 19 and 20: If only 1 Gaussian component (defau
Page 21 and 22: Working with spectral data cube
Page 23 and 24: Extract a spectrum - Script mode Us
Page 25 and 26: Moments Images Sometimes, informati
Page 27 and 28: Spectral Lines Search 1) Use SPLATA
Page 29 and 30: ToolKit For (very?) advanced users,

Image Analysis with CASA - ESO

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