ALMA SIMULATIONS WITH CASA. Hsi-An Pan & ARC Taiwan Team
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1 ALMA SIMULATIONS WITH CASA Hsi-An Pan & ARC Taiwan Team 1
2 Download the scripts Prepare from the of workshop reminder Install CASA or later Make sure it works > casapy casa version You should see something like this Command Line Prompt & Logger Window 2
3 Prepare Check antenna configuration open a terminal > casapy If you didn t see the cycle 5 configuration: in CASA: >!update-data then check again > os.getenv('casapath').split(' ')[0] +'/data/alma/simmos/' did you see > ls /Applications/CASA.app/Contents/data/alma/simmos/ Cycle 5 configuration previous cycles 3
4 Prepare Cy5 Technical Handbook 7.2 Cycle 5 Configurations
5 CASA Basics
6 Command line python (CASA Cookbook Appendix B) CASA shell string math python command shell command exclamation mark! 6 back to shell!
7 CASA Available task > tasklist category 7
8 Tasks today 8
9 CASA Basics > help imhead # get help > imagename= test.image > inp # check input parameters it s red something is wrong > inp imhead # parameters > go # execute the task if you use script: > execfile( script.py ) > default(imhead) #reset > exit # exit CASA 9
10 CASA Simulation CASA Cookbook Chapter 9
11 Note for proposers Only values from the ALMA Sensitivity Calculator should be used to estimate exposure time in ALMA proposals DO NOT QUOTE THE SIMULATED VALUES (e.g. noise level) for your Technical Justification. Simulation makes use of representative Cycle 5 antenna configurations, the actual configuration could DIFFER somewhat in real observations. 11
12 ALMA Observation Simulation input image model simboserve() generate visibility simanalyze() Image format FITS Image dimensions 2D in > 2D out cube in > cube out Image type a theoretical model (noise free) a previous observation (with noise) may overestimate noise Transforming to images 12
13 Create Point Sources PointSources/Create_pointsources.py if in CASA, >!vi Create_pointsources.py! Create 5 point sources 13
14 Create Point Sources create an image Set up the image 14 Put the point sources to the image & export to a FITS file
15 Create Point Sources > execfile( Create_pointsources.py )
16 Check the Created Image check the current directory, you should find two image files: Gaussian.im is in CASA format, Gaussian.fits is FITS format. > viewer
17 Check the Created Image 1 see 4 points? 2 17
18 Check the Created Image statistics 18
19 Check the Created Image
20 Observe the Point Sources > inp simobserve 20
21 Observe the Point Sources!vi Sim_Point_sources.py or any text editor you love. 21
22 Observe the Point Sources inbright: peak brightness in Jy/pixel, or "" for unchanged "unchanged" will take the numerical values in your image and assume they are in Jy/ pixel, even if it says some other unit in the header. 22
23 Observe the Point Sources check the Sensitivity Calculator for the recommended value > execfile( Sim_Point_sources.py') 23
24 Observe the Point Sources Science Portal / Sensitivity Calculator
25 Output mosaic pattern (change refdate) source el. vs time antenna position uv-coverage dirty beam 25
26 Imaging 26
27 Imaging > execfile( Sim_Point_sources.py') 27
28 Beam size imhead : beam size, cell size imstat : noise level (do not use it for your TJ!) 28
29 Output XXX.ptg.txt XXX.flux XXX.model XXX.ms XXX.psf XXX.residual check simanalyze task description observed pointings sky sensitivity clean component measurement set (visibility) dirty beam residual image after clean XXX.skymodel XXX.skymodel.flat XXX,skymodel.flat.regrid you input model sky image (original size) flux-rescaled model sky image regrid to the size of simulated image XXX.skymodel.flat.regrid.conv and convolved with the clean beam XXX.noisy.OOO XXX.noisy.image 29
30 More Explanation Step-by-step tutorial of other cases 30
31 4 cases Please Try Other Scripts PointSources M51_SinglePointing Extended source single pointing observation M51_Mosaic Extended source mosaic (7-pointing) observation M51_SinglePointing_HighRes Extended source single pointing obs., high resolution 31
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