EVLA high frequency spectral line tutorial - IRC+10216 - calibration: Difference between revisions
(Created page with "'''This guide is under development.''' =Getting the data= The data for this tutorial can be obtained by anonymous FTP from <tt>ftp://ftp.aoc.nrao.edu/staff/gvanmoor/community_d...") |
No edit summary |
||
Line 11: | Line 11: | ||
wget 'ftp://ftp.aoc.nrao.edu/staff/gvanmoor/community_day/*' | wget 'ftp://ftp.aoc.nrao.edu/staff/gvanmoor/community_day/*' | ||
</source> | </source> | ||
=Data Inspection= | |||
{{listobs}} provides almost all relevant observational parameters such as correlator setup (frequencies, bandwidths, channel number and widths, polarization products), sources, scans, scan intents, and antenna locations. The following command writes the listobs output to a file on disk. You can review the output at any time using '''less''' from the casapy or UNIX command line. | |||
<source lang="python"> | |||
# In CASA | |||
vis='day2_TDEM0003_20s_full' | |||
listobs(vis=vis, verbose=True, listfile=vis+'.listobs.txt') | |||
</source> | |||
Here is a subset of the listobs output. | |||
<pre> | |||
Fields: 4 | |||
ID Code Name RA Decl Epoch SrcId nVis | |||
2 D J0954+1743 09:54:56.82363 +17.43.31.2224 J2000 2 32726 | |||
3 NONE IRC+10216 09:47:57.38200 +13.16.40.6600 J2000 3 99540 | |||
5 F J1229+0203 12:29:06.69973 +02.03.08.5982 J2000 5 5436 | |||
7 E J1331+3030 13:31:08.28798 +30.30.32.9589 J2000 7 2736 | |||
(nVis = Total number of time/baseline visibilities per field) | |||
Spectral Windows: (2 unique spectral windows and 1 unique polarization setups) | |||
SpwID #Chans Frame Ch1(MHz) ChanWid(kHz) TotBW(kHz) Corrs | |||
0 64 TOPO 36387.2295 125 8000 RR RL LR LL | |||
1 64 TOPO 36304.542 125 8000 RR RL LR LL | |||
Sources: 10 | |||
ID Name SpwId RestFreq(MHz) SysVel(km/s) | |||
0 J1008+0730 0 0.03639232 -0.026 | |||
0 J1008+0730 1 0.03639232 -0.026 | |||
2 J0954+1743 0 0.03639232 -0.026 | |||
2 J0954+1743 1 0.03639232 -0.026 | |||
3 IRC+10216 0 0.03639232 -0.026 | |||
3 IRC+10216 1 0.03639232 -0.026 | |||
5 J1229+0203 0 0.03639232 -0.026 | |||
5 J1229+0203 1 0.03639232 -0.026 | |||
7 J1331+3030 0 0.03639232 -0.026 | |||
7 J1331+3030 1 0.03639232 -0.026 | |||
Antennas: 19: | |||
ID Name Station Diam. Long. Lat. | |||
0 ea01 W09 25.0 m -107.37.25.2 +33.53.51.0 | |||
1 ea02 E02 25.0 m -107.37.04.4 +33.54.01.1 | |||
2 ea03 E09 25.0 m -107.36.45.1 +33.53.53.6 | |||
3 ea04 W01 25.0 m -107.37.05.9 +33.54.00.5 | |||
4 ea05 W08 25.0 m -107.37.21.6 +33.53.53.0 | |||
5 ea07 N06 25.0 m -107.37.06.9 +33.54.10.3 | |||
6 ea08 N01 25.0 m -107.37.06.0 +33.54.01.8 | |||
7 ea09 E06 25.0 m -107.36.55.6 +33.53.57.7 | |||
8 ea12 E08 25.0 m -107.36.48.9 +33.53.55.1 | |||
9 ea15 W06 25.0 m -107.37.15.6 +33.53.56.4 | |||
10 ea19 W04 25.0 m -107.37.10.8 +33.53.59.1 | |||
11 ea20 N05 25.0 m -107.37.06.7 +33.54.08.0 | |||
12 ea21 E01 25.0 m -107.37.05.7 +33.53.59.2 | |||
13 ea22 N04 25.0 m -107.37.06.5 +33.54.06.1 | |||
14 ea23 E07 25.0 m -107.36.52.4 +33.53.56.5 | |||
15 ea24 W05 25.0 m -107.37.13.0 +33.53.57.8 | |||
16 ea25 N02 25.0 m -107.37.06.2 +33.54.03.5 | |||
17 ea27 E03 25.0 m -107.37.02.8 +33.54.00.5 | |||
18 ea28 N08 25.0 m -107.37.07.5 +33.54.15.8 | |||
</pre> | |||
Note that the Rest Frequency and Systemic Velocity are wrong in the listobs log by a factor 10^6 and 1000, respectively, given the quoted units (MHz) and (km/s). This was due to a temporary error in the EVLA Observing Tool that has subsequently been fixed. Because the sky frequencies are correct, and we set the rest frequency explicitly later in the deconvolution stage, this does not present a problem for the data reductions. |
Revision as of 12:20, 5 January 2012
This guide is under development.
Getting the data
The data for this tutorial can be obtained by anonymous FTP from ftp://ftp.aoc.nrao.edu/staff/gvanmoor/community_day/. Download all 4 files TAR in this directory.
For example,
# In UNIX
wget 'ftp://ftp.aoc.nrao.edu/staff/gvanmoor/community_day/*'
Data Inspection
listobs provides almost all relevant observational parameters such as correlator setup (frequencies, bandwidths, channel number and widths, polarization products), sources, scans, scan intents, and antenna locations. The following command writes the listobs output to a file on disk. You can review the output at any time using less from the casapy or UNIX command line.
# In CASA
vis='day2_TDEM0003_20s_full'
listobs(vis=vis, verbose=True, listfile=vis+'.listobs.txt')
Here is a subset of the listobs output.
Fields: 4 ID Code Name RA Decl Epoch SrcId nVis 2 D J0954+1743 09:54:56.82363 +17.43.31.2224 J2000 2 32726 3 NONE IRC+10216 09:47:57.38200 +13.16.40.6600 J2000 3 99540 5 F J1229+0203 12:29:06.69973 +02.03.08.5982 J2000 5 5436 7 E J1331+3030 13:31:08.28798 +30.30.32.9589 J2000 7 2736 (nVis = Total number of time/baseline visibilities per field) Spectral Windows: (2 unique spectral windows and 1 unique polarization setups) SpwID #Chans Frame Ch1(MHz) ChanWid(kHz) TotBW(kHz) Corrs 0 64 TOPO 36387.2295 125 8000 RR RL LR LL 1 64 TOPO 36304.542 125 8000 RR RL LR LL Sources: 10 ID Name SpwId RestFreq(MHz) SysVel(km/s) 0 J1008+0730 0 0.03639232 -0.026 0 J1008+0730 1 0.03639232 -0.026 2 J0954+1743 0 0.03639232 -0.026 2 J0954+1743 1 0.03639232 -0.026 3 IRC+10216 0 0.03639232 -0.026 3 IRC+10216 1 0.03639232 -0.026 5 J1229+0203 0 0.03639232 -0.026 5 J1229+0203 1 0.03639232 -0.026 7 J1331+3030 0 0.03639232 -0.026 7 J1331+3030 1 0.03639232 -0.026 Antennas: 19: ID Name Station Diam. Long. Lat. 0 ea01 W09 25.0 m -107.37.25.2 +33.53.51.0 1 ea02 E02 25.0 m -107.37.04.4 +33.54.01.1 2 ea03 E09 25.0 m -107.36.45.1 +33.53.53.6 3 ea04 W01 25.0 m -107.37.05.9 +33.54.00.5 4 ea05 W08 25.0 m -107.37.21.6 +33.53.53.0 5 ea07 N06 25.0 m -107.37.06.9 +33.54.10.3 6 ea08 N01 25.0 m -107.37.06.0 +33.54.01.8 7 ea09 E06 25.0 m -107.36.55.6 +33.53.57.7 8 ea12 E08 25.0 m -107.36.48.9 +33.53.55.1 9 ea15 W06 25.0 m -107.37.15.6 +33.53.56.4 10 ea19 W04 25.0 m -107.37.10.8 +33.53.59.1 11 ea20 N05 25.0 m -107.37.06.7 +33.54.08.0 12 ea21 E01 25.0 m -107.37.05.7 +33.53.59.2 13 ea22 N04 25.0 m -107.37.06.5 +33.54.06.1 14 ea23 E07 25.0 m -107.36.52.4 +33.53.56.5 15 ea24 W05 25.0 m -107.37.13.0 +33.53.57.8 16 ea25 N02 25.0 m -107.37.06.2 +33.54.03.5 17 ea27 E03 25.0 m -107.37.02.8 +33.54.00.5 18 ea28 N08 25.0 m -107.37.07.5 +33.54.15.8
Note that the Rest Frequency and Systemic Velocity are wrong in the listobs log by a factor 10^6 and 1000, respectively, given the quoted units (MHz) and (km/s). This was due to a temporary error in the EVLA Observing Tool that has subsequently been fixed. Because the sky frequencies are correct, and we set the rest frequency explicitly later in the deconvolution stage, this does not present a problem for the data reductions.