""" This script was written for CASA 5.1.1 Datasets calibrated (in order of date observed): SB1: 2016.1.00484.L Observed 14 May 2017, 17 May 2017, and 19 May 2017 (3 execution blocks) LB1: 2016.1.00484.L Observed 06 September 2017 and 17 October 2017 (2 execution blocks) reducer: S. Andrews """ """ Starting matter """ import os execfile('reduction_utils.py') skip_plots = True # if True, can run script non-interactively """ Input for loading data """ prefix = 'SR4' SB1_path = '/full_path/to_calibrated/msfile.ms' LB1_path = '/full_path/to_calibrated/msfile.ms' # Note that if you are downloading data from the archive, your SPW numbering # may differ from this script, depending on how you split your data out! data_params = {'SB1': {'vis' : SB1_path, 'name' : 'SB1', 'field': 'SR_4', 'line_spws': np.array([0,4,8]), # CO SPWs 'line_freqs': np.array([2.30538e11, 2.30538e11, 2.30538e11]), }, 'LB1': {'vis' : LB1_path, 'name' : 'LB1', 'field' : 'SR_4', 'line_spws': np.array([3,7]), # CO SPWs 'line_freqs': np.array([2.30538e11, 2.30538e11]), } } """ For some reason the pipeline-processing in the archive does not fill out a proper visibility weight spectrum. We did this in LB1_dir: initweights(vis='calibrated_final.ms', wtmode='weight', dowtsp=True) Then ran a split command to align the SPW identifications properly: os.system('mv calibrated_final.ms orig.ms') split(vis='orig.ms', outputvis='calibrated_final.ms', spw='19,21,23,25,92,94,96,98', datacolumn='data') os.system('rm -rf orig.ms') """ """ Check data (various options here; an example) """ if not skip_plots: for i in data_params.keys(): plotms(vis=data_params[i]['vis'], xaxis='channel', yaxis='amplitude', field=data_params[i]['field'], ydatacolumn='data', avgtime='1e8', avgscan=True, avgbaseline=True, iteraxis='spw') """ Identify 50 km/s-wide region containing CO emission; then flag that and do a spectral average to a pseudo-continuum MS """ for i in data_params.keys(): flagchannels_string = get_flagchannels(data_params[i], prefix, velocity_range=np.array([-15, 25])) avg_cont(data_params[i], prefix, flagchannels=flagchannels_string) """ Define simple masks and clean scales for imaging """ mask_pa = 18 # position angle of mask in degrees mask_maj = 1.0 # semimajor axis of mask in arcsec mask_min = 0.95 # semiminor axis of mask in arcsec mask_ra = '16h25m56.16s' mask_dec = '-24.20.48.71' SB1_mask = 'ellipse[[%s, %s], [%.1farcsec, %.1farcsec], %.1fdeg]' % \ (mask_ra, mask_dec, mask_maj, mask_min, mask_pa) LB1_mask = 'ellipse[[%s, %s], [%.1farcsec, %.1farcsec], %.1fdeg]' % \ (mask_ra, mask_dec, mask_maj, mask_min, mask_pa) SB_scales = [0, 5, 10, 15] LB_scales = [0, 5, 30, 75, 150] if not skip_plots: """ Image each dataset individually """ # images are saved in the format prefix+'_name_initcont_exec#.ms' image_each_obs(data_params['SB1'], prefix, mask=SB1_mask, scales=SB_scales, threshold='0.12mJy', interactive=False) image_each_obs(data_params['LB1'], prefix, mask=LB1_mask, scales=LB_scales, threshold='0.05mJy', interactive=False) """ Fit Gaussians to roughly estimate centers, inclinations, PAs """ fit_gaussian(prefix+'_SB1_initcont_exec0.image', region=SB1_mask) #Peak : ICRS 16h25m56.156070s -24d20m48.71150s fit_gaussian(prefix+'_SB1_initcont_exec1.image', region=SB1_mask) #Peak : ICRS 16h25m56.154349s -24d20m48.69599s fit_gaussian(prefix+'_SB1_initcont_exec2.image', region=SB1_mask) #Peak : ICRS 16h25m56.155199s -24d20m48.70696s fit_gaussian(prefix+'_LB1_initcont_exec0.image', region='circle[[%s, %s], %.1farcsec]' % (mask_ra,mask_dec,0.2)) #shrinking fit region to avoid bias from large gap #Peak : ICRS 16h25m56.156231s -24d20m48.70116s fit_gaussian(prefix+'_LB1_initcont_exec1.image', region='circle[[%s, %s], %.1farcsec]' % (mask_ra,mask_dec,0.2)) #shrinking fit region to avoid bias from large gap #Peak : ICRS 16h25m56.156478s -24d20m48.69079s #PA of Gaussian component: 0.15 deg #Inclination of Gaussian component: 55.02 deg """ The emission appears to be aligned. """ """ Split out individual MSs for each execution """ split_all_obs(prefix+'_SB1_initcont.ms', prefix+'_SB1_initcont_exec') split_all_obs(prefix+'_LB1_initcont.ms', prefix+'_LB1_initcont_exec') """ Inspect the flux calibration. """ if not skip_plots: """ Assign rough emission geometry parameters and centers. """ PA, incl = 23, 26 phasecenter = au.radec2deg('16:25:56.160000, -24.20.48.20000') peakpos = au.radec2deg('16:25:56.156, -24.20.48.691') offsets = au.angularSeparation(peakpos[0], peakpos[1], phasecenter[0], phasecenter[1], True) offx, offy = 3600.*offsets[3], 3600.*offsets[2] """ Export MS contents into Numpy save files """ for msfile in [prefix+'_SB1_initcont_exec0.ms', prefix+'_SB1_initcont_exec1.ms', prefix+'_SB1_initcont_exec2.ms', prefix+'_LB1_initcont_exec0.ms', prefix+'_LB1_initcont_exec1.ms']: export_MS(msfile) """ Plot deprojected visibility profiles for all data together """ plot_deprojected([prefix+'_SB1_initcont_exec0.vis.npz', prefix+'_SB1_initcont_exec1.vis.npz', prefix+'_SB1_initcont_exec2.vis.npz', prefix+'_LB1_initcont_exec0.vis.npz', prefix+'_LB1_initcont_exec1.vis.npz'], fluxscale=[1.0, 1.0, 1.0, 1.0, 1.0], offx=offx, offy=offy, PA=PA, incl=incl, show_err=False) # small, but non-negligible discrepancies; use SB1xEB1 as reference """ Now inspect offsets by comparing against a reference """ estimate_flux_scale(reference=prefix+'_SB1_initcont_exec1_shift.vis.npz', comparison=prefix+'_SB1_initcont_exec0_shift.vis.npz', offx=offx, offy=offy, incl=incl, PA=PA) #The ratio of comparison : reference is 0.92306 #The scaling factor for gencal is 0.961 for your comparison measurement estimate_flux_scale(reference=prefix+'_SB1_initcont_exec1_shift.vis.npz', comparison=prefix+'_SB1_initcont_exec2_shift.vis.npz', offx=offx, offy=offy, incl=incl, PA=PA) #The ratio of comparison : reference is 0.98411 #The scaling factor for gencal is 0.992 for your comparison measurement estimate_flux_scale(reference=prefix+'_SB1_initcont_exec1_shift.vis.npz', comparison=prefix+'_LB1_initcont_exec0_shift.vis.npz', offx=offx, offy=offy, incl=incl, PA=PA) #The ratio of comparison : reference is 1.11060 #The scaling factor for gencal is 1.054 for your comparison measurement estimate_flux_scale(reference=prefix+'_SB1_initcont_exec1_shift.vis.npz', comparison=prefix+'_LB1_initcont_exec1.vis.npz', offx=offx, offy=offy, incl=incl, PA=PA) #The ratio of comparison : reference is 0.93695 #The scaling factor for gencal is 0.968 for your comparison measurement """ Correct the flux scales where appropriate. """ rescale_flux(prefix+'_SB1_initcont_exec0.ms', [0.961]) rescale_flux(prefix+'_SB1_initcont_exec2.ms', [0.992]) # while small, we know this one is under-estimated relative the calibration # catalog; so even though we normally wouldn't modify, it seems appropriate rescale_flux(prefix+'_LB1_initcont_exec0.ms', [1.054]) rescale_flux(prefix+'_LB1_initcont_exec1.ms', [0.968]) """ SELF-CAL for short-baseline data """ """ Merge the SB executions back into a single MS """ SB_cont_p0 = prefix+'_SB_contp0' os.system('rm -rf %s*' % SB_cont_p0) concat(vis=[prefix+'_SB1_initcont_exec0_rescaled.ms', prefix+'_SB1_initcont_exec1.ms', prefix+'_SB1_initcont_exec2_rescaled.ms'], concatvis=SB_cont_p0+'.ms', dirtol='0.1arcsec', copypointing=False) """ Set up a clean mask """ common_mask = LB1_mask """ Initial clean """ tclean_wrapper(vis=SB_cont_p0+'.ms', imagename=SB_cont_p0, mask=common_mask, scales=SB_scales, threshold='0.15mJy', savemodel='modelcolumn') """ Define a noise annulus, measure the peak SNR in map """ noise_annulus = "annulus[[%s, %s],['%.2farcsec', '4.25arcsec']]" % \ (mask_ra, mask_dec, 1.1*mask_maj) estimate_SNR(SB_cont_p0+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_SB_contp0.image #Beam 0.268 arcsec x 0.225 arcsec (88.26 deg) #Flux inside disk mask: 68.52 mJy #Peak intensity of source: 27.20 mJy/beam #rms: 7.25e-02 mJy/beam #Peak SNR: 375.43 """ Self-calibration parameters """ SB_contspws = '0~11' SB_refant = 'DA46, DA51' SB1_obs0_timerange = '2017/05/13/00~2017/05/15/00' SB1_obs1_timerange = '2017/05/15/00~2017/05/18/00' SB1_obs2_timerange = '2017/05/18/00~2017/05/20/00' """ First round of phase-only self-cal (short baselines only) """ SB_p1 = prefix+'_SB.p1' os.system('rm -rf '+SB_p1) gaincal(vis=SB_cont_p0+'.ms', caltable=SB_p1, gaintype='T', spw=SB_contspws, refant=SB_refant, calmode='p', solint='30s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=SB_p1, xaxis='time', yaxis='phase',subplot=441, iteration='antenna', timerange=SB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=SB_p1, xaxis='time', yaxis='phase',subplot=441, iteration='antenna', timerange=SB1_obs1_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=SB_p1, xaxis='time', yaxis='phase',subplot=441, iteration='antenna', timerange=SB1_obs2_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=SB_cont_p0+'.ms', spw=SB_contspws, gaintable=[SB_p1], interp='linearPD', calwt=True) """ Split off a corrected MS """ SB_cont_p1 = prefix+'_SB_contp1' os.system('rm -rf %s*' % SB_cont_p1) split(vis=SB_cont_p0+'.ms', outputvis=SB_cont_p1+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=SB_cont_p1+'.ms', imagename=SB_cont_p1, mask=common_mask, scales=SB_scales, threshold='0.1mJy', savemodel='modelcolumn') estimate_SNR(SB_cont_p1+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_SB_contp1.image #Beam 0.268 arcsec x 0.225 arcsec (88.29 deg) #Flux inside disk mask: 69.43 mJy #Peak intensity of source: 28.86 mJy/beam #rms: 3.40e-02 mJy/beam #Peak SNR: 849.90 """ Second round of phase-only self-cal (short baselines only) """ SB_p2 = prefix+'_SB.p2' os.system('rm -rf '+SB_p2) gaincal(vis=SB_cont_p1+'.ms', caltable=SB_p2, gaintype='T', spw=SB_contspws, refant=SB_refant, calmode='p', solint='18s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=SB_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=SB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=SB_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=SB1_obs1_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=SB_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=SB1_obs2_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=SB_cont_p1+'.ms', spw=SB_contspws, gaintable=[SB_p2], interp='linearPD', calwt=True) """ Split off a corrected MS """ SB_cont_p2 = prefix+'_SB_contp2' os.system('rm -rf %s*' % SB_cont_p2) split(vis=SB_cont_p1+'.ms', outputvis=SB_cont_p2+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=SB_cont_p2+'.ms', imagename=SB_cont_p2, mask=common_mask, scales=SB_scales, threshold='0.07mJy', savemodel='modelcolumn') estimate_SNR(SB_cont_p2+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_SB_contp2.image #Beam 0.268 arcsec x 0.225 arcsec (88.30 deg) #Flux inside disk mask: 69.57 mJy #Peak intensity of source: 29.05 mJy/beam #rms: 3.40e-02 mJy/beam #Peak SNR: 854.08 """ Amplitude self-cal (short baselines only) """ SB_ap = prefix+'_SB.ap' os.system('rm -rf '+SB_ap) gaincal(vis=SB_cont_p2+'.ms', caltable=SB_ap, gaintype='T', spw=SB_contspws, refant=SB_refant, calmode='ap', solint='inf', minsnr=3.0, minblperant=4, solnorm=False) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=SB_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=SB1_obs0_timerange, plotrange=[0,0,0,2]) plotcal(caltable=SB_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=SB1_obs1_timerange, plotrange=[0,0,0,2]) plotcal(caltable=SB_ap, xaxis='time', yaxis='amp', subplot=441, iteration='antenna', timerange=SB1_obs2_timerange, plotrange=[0,0,0,2]) """ Apply the solutions """ applycal(vis=SB_cont_p2+'.ms', spw=SB_contspws, gaintable=[SB_ap], interp='linearPD', calwt=True) """ Split off a corrected MS """ SB_cont_ap = prefix+'_SB_contap' os.system('rm -rf %s*' % SB_cont_ap) split(vis=SB_cont_p2+'.ms', outputvis=SB_cont_ap+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=SB_cont_ap+'.ms', imagename=SB_cont_ap, mask=common_mask, scales=SB_scales, threshold='0.07mJy', savemodel='modelcolumn') estimate_SNR(SB_cont_ap+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_SB_contap.image #Beam 0.268 arcsec x 0.224 arcsec (88.34 deg) #Flux inside disk mask: 69.74 mJy #Peak intensity of source: 28.84 mJy/beam #rms: 2.87e-02 mJy/beam #Peak SNR: 1003.76 """ SELF-CAL for the combined (short-baseline + long-baseline) data """ """ Merge the SB+LB executions into a single MS """ combined_cont_p0 = prefix+'_combined_contp0' os.system('rm -rf %s*' % combined_cont_p0) concat(vis=[SB_cont_ap+'.ms', prefix+'_LB1_initcont_exec0_rescaled.ms', prefix+'_LB1_initcont_exec1_rescaled.ms'], concatvis=combined_cont_p0+'.ms', dirtol='0.1arcsec', copypointing=False) """ Initial clean """ tclean_wrapper(vis=combined_cont_p0+'.ms', imagename=combined_cont_p0, mask=common_mask, scales=LB_scales, threshold='0.05mJy', savemodel='modelcolumn') estimate_SNR(combined_cont_p0+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_combined_contp0.image #Beam 0.055 arcsec x 0.035 arcsec (-87.22 deg) #Flux inside disk mask: 70.02 mJy #Peak intensity of source: 3.89 mJy/beam #rms: 1.34e-02 mJy/beam #Peak SNR: 290.94 """ Self-calibration parameters """ combined_contspws = '0~19' combined_refant = 'DA61@A015,DV09@A007,DA46@A034,DA51@A124' combined_spwmap = [0,0,0,0,4,4,4,4,8,8,8,8,12,12,12,12,16,16,16,16] LB1_obs0_timerange = '2017/09/05/00~2017/09/07/00' LB2_obs1_timerange = '2017/10/16/00~2017/10/18/00' """ First round of phase-only self-cal (all data) """ combined_p1 = prefix+'_combined.p1' os.system('rm -rf '+combined_p1) gaincal(vis=combined_cont_p0+'.ms', caltable=combined_p1, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='900s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p1, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p1, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p0+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p1], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p1 = prefix+'_combined_contp1' os.system('rm -rf %s*' % combined_cont_p1) split(vis=combined_cont_p0+'.ms', outputvis=combined_cont_p1+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p1+'.ms', imagename=combined_cont_p1, mask=common_mask, scales=LB_scales, threshold='0.04mJy', savemodel='modelcolumn') estimate_SNR(combined_cont_p1+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_combined_contp1.image #Beam 0.055 arcsec x 0.035 arcsec (-87.22 deg) #Flux inside disk mask: 70.06 mJy #Peak intensity of source: 3.96 mJy/beam #rms: 1.30e-02 mJy/beam #Peak SNR: 305.15 """ Second round of phase-only self-cal (all data) """ combined_p2 = prefix+'_combined.p2' os.system('rm -rf '+combined_p2) gaincal(vis=combined_cont_p1+'.ms', caltable=combined_p2, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='360s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p2, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p1+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p2], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p2 = prefix+'_combined_contp2' os.system('rm -rf %s*' % combined_cont_p2) split(vis=combined_cont_p1+'.ms', outputvis=combined_cont_p2+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p2+'.ms', imagename=combined_cont_p2, mask=common_mask, scales=LB_scales, threshold='0.04mJy', savemodel='modelcolumn') estimate_SNR(combined_cont_p2+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_combined_contp2.image #Beam 0.055 arcsec x 0.035 arcsec (-87.22 deg) #Flux inside disk mask: 69.98 mJy #Peak intensity of source: 3.96 mJy/beam #rms: 1.30e-02 mJy/beam #Peak SNR: 305.33 # ** map quality still improving ** """ Third round of phase-only self-cal (all data) """ combined_p3 = prefix+'_combined.p3' os.system('rm -rf '+combined_p3) gaincal(vis=combined_cont_p2+'.ms', caltable=combined_p3, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='180s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p3, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p3, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p2+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p3], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p3 = prefix+'_combined_contp3' os.system('rm -rf %s*' % combined_cont_p3) split(vis=combined_cont_p2+'.ms', outputvis=combined_cont_p3+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p3+'.ms', imagename=combined_cont_p3, mask=common_mask, scales=LB_scales, threshold='0.03mJy', savemodel='modelcolumn') estimate_SNR(combined_cont_p3+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_combined_contp3.image #Beam 0.055 arcsec x 0.035 arcsec (-87.22 deg) #Flux inside disk mask: 69.83 mJy #Peak intensity of source: 4.09 mJy/beam #rms: 1.27e-02 mJy/beam #Peak SNR: 322.48 """ Fourth round of phase-only self-cal (all data) """ combined_p4 = prefix+'_combined.p4' os.system('rm -rf '+combined_p4) gaincal(vis=combined_cont_p3+'.ms', caltable=combined_p4, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='60s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p4, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p4, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p3+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p4], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p4 = prefix+'_combined_contp4' os.system('rm -rf %s*' % combined_cont_p4) split(vis=combined_cont_p3+'.ms', outputvis=combined_cont_p4+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p4+'.ms', imagename=combined_cont_p4, mask=common_mask, scales=LB_scales, threshold='0.03mJy', savemodel='modelcolumn') estimate_SNR(combined_cont_p4+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_combined_contp4.image #Beam 0.055 arcsec x 0.035 arcsec (-87.22 deg) #Flux inside disk mask: 69.63 mJy #Peak intensity of source: 4.25 mJy/beam #rms: 1.25e-02 mJy/beam #Peak SNR: 340.55 """ Fifth round of phase-only self-cal (all data) """ combined_p5 = prefix+'_combined.p5' os.system('rm -rf '+combined_p5) gaincal(vis=combined_cont_p4+'.ms', caltable=combined_p5, gaintype='T', combine='spw,scan', spw=combined_contspws, refant=combined_refant, calmode='p', solint='30s', minsnr=1.5, minblperant=4) if not skip_plots: """ Inspect gain tables """ plotcal(caltable=combined_p5, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB1_obs0_timerange, plotrange=[0,0,-180,180]) plotcal(caltable=combined_p5, xaxis='time', yaxis='phase', subplot=441, iteration='antenna', timerange=LB2_obs1_timerange, plotrange=[0,0,-180,180]) """ Apply the solutions """ applycal(vis=combined_cont_p4+'.ms', spw=combined_contspws, spwmap=combined_spwmap, gaintable=[combined_p5], interp='linearPD', calwt=True, applymode='calonly') """ Split off a corrected MS """ combined_cont_p5 = prefix+'_combined_contp5' os.system('rm -rf %s*' % combined_cont_p5) split(vis=combined_cont_p4+'.ms', outputvis=combined_cont_p5+'.ms', datacolumn='corrected') """ Image the results; check the resulting map """ tclean_wrapper(vis=combined_cont_p5+'.ms', imagename=combined_cont_p5, mask=common_mask, scales=LB_scales, threshold='0.03mJy', savemodel='modelcolumn') estimate_SNR(combined_cont_p5+'.image', disk_mask=common_mask, noise_mask=noise_annulus) #SR4_combined_contp5.image #Beam 0.055 arcsec x 0.035 arcsec (-87.22 deg) #Flux inside disk mask: 69.84 mJy #Peak intensity of source: 4.31 mJy/beam #rms: 1.25e-02 mJy/beam #Peak SNR: 346.00 """ Additional phase-only cal on shorter intervals or amp self-cal attempts are not helpful. """ """ Final outputs """ """ Save the final MS """ os.system('cp -r '+combined_cont_p5+'.ms '+prefix+'_continuum.ms') os.system('tar cvzf '+prefix+'_continuum.ms.tgz '+prefix+'_continuum.ms') """ Make a fiducial continuum image (based on experimentation) """ fid_mask = 'circle[[%s, %s], %.1farcsec]' % (mask_ra, mask_dec, 0.7) scales = [0, 5, 30, 75, 150] tclean_wrapper(vis=combined_cont_p5+'.ms', imagename=prefix+'_continuum', mask=fid_mask, scales=scales, threshold='0.05mJy', robust=-0.5, uvtaper=['0.035arcsec', '0.01arcsec', '0deg']) exportfits(prefix+'_continuum.image', prefix+'_continuum.fits')