PdBI uv-data analysis in practice. Arancha Castro-Carrizo
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1 PdBI uv-data analysis in practice Arancha Castro-Carrizo
2 General Picture image plane brightness (x,y) What we want uv plane FT visibility (u,v) What we obtain with an interferometer
3 General Picture image plane uv plane brightness (x,y) visibility (u,v) instr IPB data Calibration lmv* (gdf) brightness (x,y) uv Gridding FFT Cleaning hpb files visibility visibility(u,v) (u,v)obs uv-table Data processed enough to have removed all instrumental contribution Data raw enough to access to observational characteristics: baseline, scan, weight, etc. Data not yet affected by the imaging process : assumptions, interpolations, computations, etc.
4 Summary 1. Let s create a uv-table, in CLIC 2. Data analysis, in MAPPING Data analysis in the uv-plane An inspection of the uv-data needed
5 Let s create a table ( mytable.uvt), in CLIC
6 Creating a uv-table; CLIC
7 Creating a uv-table; CLIC
8 Creating a uv-table; CLIC
9 Creating a uv-astro> table; line CLIC + plot clic> header /plot (clic> header) narrow 1 < IF3 units narrow 2
10 L01 L02 narrow Qi Qj L07 L04 L03 L05 L06 Qi (N1) L08 Qj (N2) Q1 Q2 Q3 Q4 N1 H H V V N2 V V H H IF3 100 MHz 1100 MHz Narrow Band Correlator Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q MHz CONFIG V pol H pol 7800 MHz IF1 W2 (L10) W4 (L12) V pol W1 (L09) W3 (L11) H pol Wide Band Correlator FIXED
11 Creating a uv-table; CLIC
12 Creating a uv-table; CLIC
13 Creating a uv-table; CLIC Easy and faster edit table script
14 --- script
15 2nd data set
16 2nd data set
17
18
19 continuum
20 remove line contribution continuum
21 Mosaic a table for each offset tablename - i.uvt
22 Mosaic 2nd data set
23 Created mytable.uvt, in CLIC Analyze the data, in MAPPING
24 1. Data analysis in the uv-plane
25 Data analysis in the uv-plane; MAPPING
26 Data analysis in the uv-plane
27 Data analysis in the uv-plane
28 Data analysis in the uv-plane UVCOV
29 Data analysis in the uv-plane UVSHOW
30 Data analysis in the uv-plane UVSHOW
31 Data analysis in the uv-plane
32 Data analysis in the uv-plane
33 Data analysis in the uv-plane
34 With commands: MAPPING> let first 12 MAPPING> let last 12 MAPPING> let ytype weight MAPPING> let xtype radius MAPPING> let error_bars yes MAPPING> go uvshow MAPPING> input uvshow Data analysis in the uv-plane
35 Data analysis in the uv-plane
36 Data analysis in the uv-plane
37 Data analysis in the uv-plane
38 Data analysis in the uv-plane often needed
39 Data analysis in the uv-plane
40 Data analysis in the uv-plane Point model: 3 parameters
41 Data analysis in the uv-plane Circular Gaussian: 4 parameters
42 Data analysis in the uv-plane Elliptical Gaussian: 5 parameters
43 Data analysis in the uv-plane
44 Data analysis in the uv-plane
45 Data analysis in the uv-plane MAPPING procedures / tasks MAPPING> go MAPPING> input also MAPPING> run MAPPING> help
46 Data analysis in the uv-plane MAPPING> go or MAPPING> input or run help uv_applyphase uv_dft uv_merge uv_solve uv_ascal uv_extract uv_mflag uv_sort uv_atm uv_fidelity uv_model uv_splitfield uv_average uv_fit-s uv_mult uv_stat uv_cal uv_flag uv_noise uv_substract uv_ccmodel uv_fmodel uv_observe uv_table uv_cct uv_gain uv_pointing uv_timeaverage uv_center uv_hanning uv_selfcal uv_timebase uv_circle uv_hybrid uv_shift uv_track uv_clip uv_list uv_short uv_track_phase uv_compress uv_map uv_single uv_zero uv_cuts uv_mcal uv_sinusphase
47 Data analysis in the uv-plane
48 Data analysis in the uv-plane MAPPING> go or run MAPPING> input or help uv_applyphase uv_dft uv_merge uv_solve uv_ascal uv_extract uv_mflag uv_sort uv_atm uv_fidelity uv_model uv_splitfield uv_average uv_fit-s uv_mult uv_stat uv_cal uv_flag uv_noise uv_substract uv_ccmodel uv_fmodel uv_observe uv_table uv_cct uv_gain uv_pointing uv_timeaverage uv_center uv_hanning uv_selfcal uv_timebase uv_circle uv_hybrid uv_shift uv_track uv_clip uv_list uv_short uv_track_phase uv_compress uv_map uv_single uv_zero uv_cuts uv_mcal uv_sinusphase
49 Data analysis in the uv-plane MAPPING> go or MAPPING> input or run help uv_applyphase uv_dft uv_merge uv_solve uv_ascal uv_extract uv_mflag uv_sort uv_atm uv_fidelity uv_model uv_splitfield uv_average uv_fit-s uv_mult uv_stat uv_cal uv_flag uv_noise uv_substract uv_ccmodel uv_fmodel uv_observe uv_table uv_cct uv_gain uv_pointing uv_timeaverage uv_center uv_hanning uv_selfcal uv_timebase uv_circle uv_clip uv_hybrid uv_shift uv_track To create a uv table from an image, e.g. a model uv_list uv_short uv_track_phase uv_compress uv_map uv_single uv_cuts uv_mcal uv_sinusphase uv_zero
50 Data analysis in the uv-plane MAPPING> go or run MAPPING> input or help uv_applyphase uv_dft uv_merge uv_solve uv_ascal uv_extract uv_mflag uv_sort uv_atm uv_fidelity uv_model uv_splitfield To substract a time-averaged continuum uv table uv_average uv_fit-s uv_mult uv_stat uv_cal uv_flag uv_noise uv_subtract uv_ccmodel uv_fmodel uv_observe uv_table uv_cct uv_gain uv_pointing uv_timeaverage uv_center uv_hanning uv_selfcal uv_timebase uv_circle uv_hybrid uv_shift uv_track uv_clip uv_list uv_short uv_track_phase uv_compress uv_map uv_single uv_zero uv_cuts uv_mcal uv_sinusphase
51 Data analysis in the uv-plane MAPPING> go or MAPPING> input or run help uv_applyphase uv_dft uv_merge uv_solve uv_ascal uv_extract uv_mflag uv_sort uv_atm uv_fidelity uv_model uv_splitfield uv_average uv_fit-s uv_mult uv_stat uv_cal uv_flag uv_noise uv_subtract uv_ccmodel uv_fmodel uv_observe uv_table uv_cct uv_gain uv_pointing uv_timeaverage uv_center uv_hanning uv_selfcal To add a single-dish zero-spacing spectrum uv_circle uv_hybrid uv_shift uv_timebase uv_clip uv_list uv_short uv_track_phase uv_compress uv_map uv_single uv_zero uv_cuts uv_mcal uv_sinusphase uv_track
52 Data analysis in the uv-plane uv tables are fully editable Each visibility contains: uv table [ visib dimension, # visibilities ] u in meters visib dimension = x (# channels) v in meters scan number 7 visib. characteristics observation date (CLASS number) time in seconds (since date above) start antenna in the baseline end antenna in the baseline real part imaginary part weight for 1st channel 1st channel 1st channel real part imaginary part 2 channel data at 1st channel mapping> define table aa mytable.uvt write for 2nd channel nd data at 2 channel mapping> let aa[8,2380] 6000 nd mapping> delete /variable aa
53 3. An inspection of the data in the uv-plane is recommended
54 (1) Passing directly from hpb mapping It may happen
55 (1) Passing directly from hpb mapping It may happen
56 (1) Passing directly from hpb mapping It may happen that there remain some wrong visibilities MAPPING> uv_flag Return to CLIC to identify the wrong visibilities and flag them in the hpb file CLIC> find /proc corr /sou Betel /rece 2 /scans CLIC> cursor store quality 9
57 (2) Passing directly from hpb mapping When short-spacing data, check that the relative calibration is ok + Short-spacing data
58 (3) Passing directly from hpb mapping Good practice: When cleaning (extended sources)
59 (3) Passing directly from hpb mapping Good practice: When cleaning (extended sources) verify that the flux obtained in the image plane coincides with that at the zero-spacing
60 (3) Passing directly from hpb mapping If not, it may happen
61 (3) Passing directly from hpb mapping It may happen When cleaning (extended sources) verify that the flux obtained in the image plane coincides with that at the zero-spacing
62 To conclude: An inspection of data in the uv-plane is recommended for all the projects A detailed analysis in the uv-plane: detection, modeling of simple shapes, to check relative calibration, etc
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