[daip] Your query of the analysts
Hau Yu Liu
hyliu at asiaa.sinica.edu.tw
Mon Oct 20 20:37:35 EDT 2008
Dear sir,
Currently I met a problem of using AIPS to load VLA archived data AK0517.
I used the task fillm to do it, and leaves most of the options blank, as listed:
#task 'fillm'
>inp
AIPS 1: FILLM Task to read a VLA archive tape
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INTAPE 1 Tape drive number
AIPS 1: INFILE 'AK517:AK517_' Non-blank: disk file name
AIPS 1: NFILES 0 Number of files to advance
AIPS 1: Also applies to ON-LINE!
AIPS 1: BAND ' ' Freq. band:
AIPS 1: (4,P,L,S,C,X,U,K,A,Q)
AIPS 1: QUAL -1 Source qualifier -1=>all
AIPS 1: CALCODE ' ' Calibrator code
AIPS 1: VLAOBS ' ' VLA obs. pgm. name ('AZ99')
AIPS 1: VLAMODE ' ' VLA obs. mode (' '=any)
AIPS 1: REFDATE ' ' Reference date. 'yyyymmdd'
AIPS 1: TIMERANG *all 0 Timerange selected
AIPS 1: BCHAN 1 First spectral channel
AIPS 1: ECHAN 0 Highest spectral channel
AIPS 1: OUTNAME 'TEST' Output UV file name (name)
AIPS 1: OUTSEQ 0 Output UV file name (seq. #)
AIPS 1: OUTDISK 1 Output UV file disk unit #.
AIPS 1: DOUVCOMP 1 1 (T) => compressed data
AIPS 1: DOCONCAT -1 1 (T) => append data to old
AIPS 1: files
AIPS 1: NCOUNT 1 Number of files to read
AIPS 1: DOWEIGHT 1 Use nominal sensitivity to
AIPS 1: scale weights?
AIPS 1: = 10, use Memo 108 weights
AIPS 1: DOACOR -1 Load autocorrelation data?
AIPS 1: CPARM 0 0 User options.
AIPS 1: 0 0 1 => Avg. time (seconds)
AIPS 1: 0 0 2 => bitmap (see help)
AIPS 1: 6300 *rest 0 = 16 for planets & Sun
AIPS 1: 3 => Max. OK IF status
AIPS 1: <=3 => 3
AIPS 1: 4 => Control dropping of
AIPS 1: shadowed data
AIPS 1: < 0 => no shadow check
AIPS 1: 0 => 25 m limit
AIPS 1: > 0 => Shadow limit is
AIPS 1: CPARM(4) in meters
AIPS 1: 5 = channel code (see HELP)
AIPS 1: 6 => Subarray number-see HELP
AIPS 1: 7 => FQ entry tolerance (kHz)
AIPS 1: (see HELP)
AIPS 1: 8 => CL table time incr. min
AIPS 1: 9 => TY table time incr. min
AIPS 1: 10=> Calibrator avg. time
AIPS 1: DPARM *all 0 Selection by Frequency
AIPS 1: 1+2 => A Frequency (Hz)
AIPS 1: 3+4 => B Frequency (Hz)
AIPS 1: 5+6 => C Frequency (Hz)
AIPS 1: 7+8 => D Frequency (Hz)
AIPS 1: 9 => tolerance for A&C
AIPS 1: 10 => tolerance for B&D
AIPS 1: BPARM *all 0 Opacity and Gain curve
AIPS 1: control (see help)
AIPS 1: IN2FILE *all ' ' Antenna gains file
>From the scan listed on the VLA data archive website, this archived data contains
two IF band with frequency 23.69GHz and 23.72 GHz, respectively. And each of them
had been measured in 'RR' and 'LL'.
However, after loading the data into AIPS, I got two UV line data, with 23.69GHz band
in one file and 23.72GHz in the other. But the first file only contains 'RR'
correlation, and the second file contains only 'LL' correlation.
Here are the header of each of them:
>imh
AIPS 1: Image=MULTI (UV) Filename=20001023 .LINE . 1
AIPS 1: Telescope=VLA Receiver=VLA
AIPS 1: Observer=AK517 User #= 2
AIPS 1: Observ. date=23-OCT-2000 Map date=18-OCT-2008
AIPS 1: # visibilities 113850 Sort order TB
AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN BASELINE TIME1
AIPS 1: SOURCE FREQSEL WEIGHT SCALE
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 1: COMPLEX 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: STOKES 1 -1.0000000E+00 1.00 -1.0000000E+00 0.00
AIPS 1: FREQ 63 2.3696098E+10 32.00 9.7656250E+04 0.00
AIPS 1: IF 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: RA 1 00 00 00.000 1.00 3600.000 0.00
AIPS 1: DEC 1 00 00 00.000 1.00 3600.000 0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 1950.00
AIPS 1: Maximum version number of extension files of type HI is 1
AIPS 1: Maximum version number of extension files of type AN is 1
AIPS 1: Maximum version number of extension files of type NX is 1
AIPS 1: Maximum version number of extension files of type SU is 1
AIPS 1: Maximum version number of extension files of type FQ is 1
AIPS 1: Maximum version number of extension files of type CL is 1
AIPS 1: Maximum version number of extension files of type TY is 1
AIPS 1: Maximum version number of extension files of type WX is 1
AIPS 1: Maximum version number of extension files of type OF is 1
AIPS 1: Keyword = 'OBSCHANS' value = 64
AIPS 1: Keyword = 'CORRMODE' value = '2AD '
AIPS 1: Keyword = 'SELCHANS' value = 63
AIPS 1: Keyword = 'VLAIFS ' value = 'A '
AIPS 1: Keyword = 'CORRCOEF' value = -1
AIPS 1: Image=MULTI (UV) Filename=TEST .LINE . 2
AIPS 1: Telescope=VLA Receiver=VLA
AIPS 1: Observer=AK517 User #= 2
AIPS 1: Observ. date=23-OCT-2000 Map date=20-OCT-2008
AIPS 1: # visibilities 115324 Sort order TB
AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN BASELINE TIME1
AIPS 1: SOURCE FREQSEL WEIGHT SCALE
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 1: COMPLEX 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: STOKES 1 -2.0000000E+00 1.00 -1.0000000E+00 0.00
AIPS 1: FREQ 63 2.3724238E+10 32.00 9.7656250E+04 0.00
AIPS 1: IF 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: RA 1 00 00 00.000 1.00 3600.000 0.00
AIPS 1: DEC 1 00 00 00.000 1.00 3600.000 0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 1950.00
AIPS 1: Maximum version number of extension files of type HI is 1
AIPS 1: Maximum version number of extension files of type AN is 1
AIPS 1: Maximum version number of extension files of type NX is 1
AIPS 1: Maximum version number of extension files of type SU is 1
AIPS 1: Maximum version number of extension files of type FQ is 1
AIPS 1: Maximum version number of extension files of type CL is 1
AIPS 1: Maximum version number of extension files of type TY is 1
AIPS 1: Maximum version number of extension files of type WX is 1
AIPS 1: Maximum version number of extension files of type OF is 1
AIPS 1: Keyword = 'OBSCHANS' value = 64
AIPS 1: Keyword = 'CORRMODE' value = '2AD '
AIPS 1: Keyword = 'SELCHANS' value = 63
AIPS 1: Keyword = 'VLAIFS ' value = 'D '
AIPS 1: Keyword = 'CORRCOEF' value = -1
If I use LISTR to show the scan of the first UV file with STOKES set to be 'LL', then
it shows no flux is detected from 'LL'
hyliu LISTR(31DEC08) 2 21-OCT-2008 08:19:15 Page 1
File = 20001023 .LINE . 1 Vol = 1 Userid = 2
Freq = 23.696097626 GHz Ncor = 1 No. vis = 113850
Scan summary listing
Scan Source Qual Calcode Sub Timerange FrqID START VIS
END VIS
1 1328+307 : 0000 A 1 0/20:31:15 - 0/20:31:15 1 1 0
2 1328+307 : 0000 A 1 0/20:31:25 - 0/20:40:35 1 1 15513
3 1226+023 : 0000 A 1 0/20:41:55 - 0/20:50:35 1 15514 29218
4 1730-130 : 0000 A 1 0/20:53:15 - 0/20:56:35 1 29219 34580
5 G106 : 0000 1 0/20:57:15 - 0/21:12:25 1 34581 57583
6 1730-130 : 0000 A 1 0/21:13:05 - 0/21:16:25 1 57584 62189
7 G106 : 0000 1 0/21:17:05 - 0/21:32:25 1 62190 86178
8 1730-130 : 0000 A 1 0/21:33:05 - 0/21:36:25 1 86179 92135
9 G106 : 0000 1 0/21:37:05 - 0/21:48:55 1 92136 113850
Source summary
Velocity type = 'LSR ' Definition = 'RADIO '
ID Source Qual Calcode RA(1950.0) Dec(1950.0) IFlux QFlux UFlux
VFlux No. vis
1 1328+307 : 0000 A 13:28:49.6579 30:45:58.641 0.000 0.000 0.000
0.000 15513
2 1226+023 : 0000 A 12:26:33.2458 02:19:43.306 0.000 0.000 0.000
0.000 13705
3 1730-130 : 0000 A 17:30:13.5352 -13:02:45.840 0.000 0.000 0.000
0.000 15925
4 G106 : 0000 18:07:30.6800 -19:56:28.400 0.000 0.000 0.000
0.000 68707
ID Source Freq(GHz) Velocity(Km/s) Rest freq (GHz)
1 1328+307 23.6961 0.0000 23.6945
2 1226+023 23.6957 0.0000 23.6945
3 1730-130 23.6938 0.0000 23.6945
4 G106 23.6935 0.0000 23.6945
Frequency Table summary
FQID IF# Freq(GHz) BW(kHz) Ch.Sep(kHz) Sideband
1 1 23.69609763 6250.0005 97.6563 1
AIPS 1: Resumes
It seems that, while loading data, the correlator mode is not interpretated
correctly. I also got similar problem to load the archived data AK0138. From
the archive data website, I should have both 'RR' and 'LL', and the correlator
mode is '2A'. However, I can only load the 'RR' data into AIPS, and has the
VLA IF 'A'. Is there any parameter to tune to load the data correctly? Thanks
for the helping.
best wish,
Hauyu
--
Open WebMail Project (http://openwebmail.org)
---------- Original Message -----------
From: Eric Greisen <egreisen at nrao.edu>
To: Hau Yu Liu <hyliu at asiaa.sinica.edu.tw>
Cc: daip at nrao.edu
Sent: Mon, 20 Oct 2008 13:06:27 -0600
Subject: Your query of the analysts
> Please use daip at nrao.edu for queries about aips.
>
> Can you send me the display you get for each of the uv files when
> you do an IMHEADER.
>
> The PRTUV is showing you the first 4 channels of a data set that I am
> assuming is only 1 polarization. The display from LISTR with OPTYPE
> 'SCAN' would also be useful.
>
> Eric Greisen
------- End of Original Message -------
More information about the Daip
mailing list