qui#!/usr/bin/env """ split, clean, and self-cal continuum and line data NOTE: this is intended to be an interactive, iterative process so this is more a log that should be run by cutting and pasting into casa rather than as an executable script search "CHANGEME" for variables to be changed 10/9/15 MCA """ # ======================== Setup =========================== # LupusIV_153 16:01:15.550 -41:52:35.299 # Class F, SpT ? field = 43 # CHANGEME file_ms = '../science_calibrated.ms' contspw = '2,3,4' contspw_w = [128,3840,1920] robust = 0.5 # CHANGEME imsize = [640,640] cell = '0.03arcsec' imagermode = 'csclean' refant = 'DA52' # CHANGEME xc = 327 # CHANGEME yc = 312 # CHANGEME in_a = 80 out_a = 120 aper = 1.25 boxwidth = 300. box = rg.box([xc-boxwidth,yc-boxwidth],[xc+boxwidth,yc+boxwidth]) # ======================= Split Off Continuum ======================== # split off field from full ms split(vis = file_ms, outputvis = 'f'+str(field)+'.vis', field = field, datacolumn = 'data') # split off continuum (take the large bw spw and average split(vis = 'f'+str(field)+'.vis', outputvis = 'f'+str(field)+'_cont.vis', spw = contspw, width = contspw_w, datacolumn = 'data') # plot uv-distance vs. amplitude plotms(vis='f'+str(field)+'_cont.vis', xaxis='uvdist',yaxis='amp', coloraxis='spw') # plotfile='f'+str(field)+'_ampuv_orig.png' # showgui=False, # highres=True, # overwrite=True) # source is slightly resolved? # find antenna close to center of configuration # check pipeline log that this ant is OK plotants(vis='f'+str(field)+'_cont.vis') #, figfile='f'+str(field)+'_ants.png') # ================== Clean continuum before selfcal ================== # light clean (100 iterations) # os.system('rm -rf f'+str(field)+'_cont_b4sc*') clean(vis = 'f'+str(field)+'_cont.vis', imagename = 'f'+str(field)+'_cont_b4sc', mode = 'mfs', psfmode = 'clark', niter = 100, threshold = '0.0mJy', interactive = True, mask = '', cell = cell, imsize = imsize, weighting = 'briggs', robust = robust, imagermode = imagermode) im_max = imstat(imagename = 'f'+str(field)+'_cont_b4sc.image')['max'][0] im_rms = imstat(imagename = 'f'+str(field)+'_cont_b4sc.image', region='annulus[['+str(xc)+'pix,'+str(yc)+'pix],['+str(in_a)+'pix,'+str(out_a)+'pix]]')['rms'][0] print 'Peak = {0:.2f} mJy, rms = {1:.2f} mJy, S/N = {2:.1f}'.format(1000*im_max, 1000*im_rms, im_max/im_rms) # Peak = 26.46 mJy, rms = 0.39 mJy, S/N = 67.7 # ======================== Self-Calibrate 1 ================== # first combine all the data by time (solint = inf) # i.e., phase self-cal over entire integration time gaincal(vis = 'f'+str(field)+'_cont.vis', caltable = 'f'+str(field)+'_cont_pcal1', refant = refant, solint = 'inf', combine = 'spw', gaintype = 'T', spw = '', calmode = 'p', minblperant = 4, minsnr = 3) # plot phase for each antenna plotcal(caltable = 'f'+str(field)+'_cont_pcal1', xaxis = 'time', yaxis = 'phase', spw = '', iteration = 'antenna', subplot = 421, plotrange = [0,0,-200,200]) # no variation between integration times (expected since solin=inf) # note DV02 has no data (100% flagged in pipeline calibration) # apply calibration to data applycal(vis = 'f'+str(field)+'_cont.vis', spw = '', gaintable = ['f'+str(field)+'_cont_pcal1'], spwmap = [0,0,0], calwt = T, flagbackup = F) # clean self-calibrated data clean(vis = 'f'+str(field)+'_cont.vis', imagename = 'f'+str(field)+'_cont_pcal1_clean', mode = 'mfs', psfmode = 'clark', niter = 100, threshold = '0.0mJy', interactive = False, mask = 'f'+str(field)+'_cont_b4sc.mask', cell = cell, imsize = imsize, weighting = 'briggs', robust = robust, imagermode = imagermode) im_max = imstat(imagename = 'f'+str(field)+'_cont_pcal1_clean.image')['max'][0] im_rms = imstat(imagename = 'f'+str(field)+'_cont_pcal1_clean.image', region='annulus[['+str(xc)+'pix,'+str(yc)+'pix],['+str(in_a)+'pix,'+str(out_a)+'pix]]')['rms'][0] print 'Peak = {0:.2f} mJy, rms = {1:.2f} mJy, S/N = {2:.1f}'.format(1000*im_max, 1000*im_rms, im_max/im_rms) # Peak = 26.99 mJy, rms = 0.38 mJy, S/N = 71.6 (slightly better snr) # inspect images imview(raster=[{'file':'f'+str(field)+'_cont_b4sc.image'}, {'file':'f'+str(field)+'_cont_pcal1_clean.image'}]) # pcal1 looks a little sharper # ======================== Self-Calibrate 2 ================== # decrease phase self-cal solution interval to a few times integration time # int = 6s (from X125.log) gaincal(vis = 'f'+str(field)+'_cont.vis', caltable = 'f'+str(field)+'_cont_pcal2', refant = refant, solint = '20s', # CHANGEME combine = 'spw', gaintype = 'T', spw = '', calmode = 'p', minblperant = 4, minsnr = 3) # 2 of 40 solutions flagged due to SNR < 3 in spw=0 at 2015/06/14/05:28:14.4 plotcal(caltable = 'f'+str(field)+'_cont_pcal2', xaxis = 'time', yaxis = 'phase', spw = '', iteration = 'antenna', subplot = 421, plotrange = [0,0,-200,200]) applycal(vis = 'f'+str(field)+'_cont.vis', spw = '', gaintable = ['f'+str(field)+'_cont_pcal2'], spwmap = [0,0,0], calwt = T, flagbackup = F) clean(vis = 'f'+str(field)+'_cont.vis', imagename = 'f'+str(field)+'_cont_pcal2_clean', mode = 'mfs', psfmode = 'clark', niter = 100, threshold = '0.0mJy', interactive = False, mask = 'f'+str(field)+'_cont_b4sc.mask', cell = cell, imsize = imsize, weighting = 'briggs', robust = robust, imagermode = imagermode) im_max = imstat(imagename = 'f'+str(field)+'_cont_pcal2_clean.image')['max'][0] im_rms = imstat(imagename = 'f'+str(field)+'_cont_pcal2_clean.image', region='annulus[[320pix,320pix],[60pix,100pix]]')['rms'][0] print 'Peak = {0:.2f} mJy, rms = {1:.2f} mJy, S/N = {2:.1f}'.format(1000*im_max, 1000*im_rms, im_max/im_rms) # Peak = 27.23 mJy, rms = 0.41 mJy, S/N = 67.1 (slightly worse than pcal1) # inspection of the image shows no change from pcal1 imview(raster=[{'file':'f'+str(field)+'_cont_b4sc.image'}, {'file':'f'+str(field)+'_cont_pcal1_clean.image'}, {'file':'f'+str(field)+'_cont_pcal2_clean.image'}]) # pcal1 looks best, will stop here # ======================== Best Continuum Map ================== # so now run the same applycal but with flagbackup = T, applycal(vis = 'f'+str(field)+'_cont.vis', spw = '', gaintable = ['f'+str(field)+'_cont_pcal1'], # CHANGEME spwmap = [0,0,0], calwt = T, flagbackup = T) # deep clean, trying different robust weights clean(vis = 'f'+str(field)+'_cont.vis', imagename = 'f'+str(field)+'_cont_best', mode = 'mfs', psfmode = 'clark', niter = 2000, threshold = '0.0mJy', interactive = True, mask = '', cell = cell, imsize = imsize, weighting = 'briggs', robust = -1, # CHANGEME imagermode = imagermode) # placed mask slightly larger than outer continuum contour # stopped after 400 iterations once the inside became green im_max = imstat(imagename = 'f'+str(field)+'_cont_best.image')['max'][0] im_rms = imstat(imagename = 'f'+str(field)+'_cont_best.image', region='annulus[['+str(xc)+'pix,'+str(yc)+'pix],['+str(in_a)+'pix,'+str(out_a)+'pix]]')['rms'][0] bmaj = imhead(imagename = 'f'+str(field)+'_cont_best.image', mode="get", hdkey="beammajor") bmin = imhead(imagename = 'f'+str(field)+'_cont_best.image', mode="get", hdkey="beamminor") print 'Peak = {0:.2f} mJy, rms = {1:.2f} mJy, S/N = {2:.1f}'.format(1000*im_max, 1000*im_rms, im_max/im_rms) print 'Beam = {0:.2f} x {1:.2f} arcsec'.format(bmaj.get('value'),bmin.get('value')) # robust = -1 # Peak = 24.99 mJy, rms = 0.57 mJy, S/N = 43.9 # Beam = 0.34 x 0.28 arcsec # save this to a fits file exportfits(imagename='f'+str(field)+'_cont_best.image', fitsimage='f'+str(field)+'_cont.fits') # compare to before self-cal imview(raster=[{'file':'f'+str(field)+'_cont_b4sc.image'}, {'file':'f'+str(field)+'_cont_best.image'}]) # measure flux # imview(raster=[{'file':'f'+str(field)+'_cont_best.image'}]) im_rms = imstat(imagename = 'f'+str(field)+'_cont_best.image', region='annulus[['+str(xc)+'pix,'+str(yc)+'pix],['+str(in_a)+'pix,'+str(out_a)+'pix]]')['rms'][0] im_flux = imstat(imagename = 'f'+str(field)+'_cont_best.image', region='circle[['+str(xc)+'pix,'+str(yc)+'pix],'+str(aper)+'arcsec]')['flux'][0] print 'Flux = {0:.2f} mJy, rms = {1:.2f} mJy, S/N = {2:.1f}'.format(1000*im_flux, 1000*im_rms, im_flux/im_rms) # Flux = 86.38 mJy, rms = 0.57 mJy, S/N = 151.8 # re-center image on source and use measure.py to get COG flux ia.fromimage(outfile = 'f'+str(field)+'_cont_cropped.image', infile = 'f'+str(field)+'_cont.fits', region = box ) ia.close() exportfits(imagename = 'f'+str(field)+'_cont_cropped.image', fitsimage = 'f'+str(field)+'_cont_cropped.fits') ''' diameter total rms snr 3.2 87.30 2.366 36.9 diameter total rms snr 4.4 85.26 0.926 92.1 diameter peak rms snr 0.4 24.98 0.536 46.6 ''' # ======================== Measure flux with UVMODELFIT ================== # calculate offset from phase center in arcsec pixscale = 0.03 # must match 'cell' dx = pixscale*(320.0-xc) # offset to east (left) dy = pixscale*(yc-320.0) # offset to north (up) # measure flux as gaussian uvmodelfit(vis = 'f'+str(field)+'_cont.vis', comptype = 'G', sourcepar = [im_flux,dx,dy,0.5,0.5,-30.0], varypar = [T,T,T,T,T,T], niter = 10) ''' reduced chi2=1.40101 I = 0.0820722 +/- 0.000890078 x = -0.22945 +/- 0.00227919 arcsec y = -0.223355 +/- 0.00331578 arcsec a = 0.732528 +/- 0.00889827 arcsec r = 0.411032 +/- 0.00979815 p = -24.4209 +/- 0.634718 deg consistent with aperture method 16:01:15.529 -41:52:35.523 '''