Single-dish

Single-dish data are analysed using CLASS by Gaussian fits with the method CONTINUUM Beam_size which takes into account the dual-beam pattern in elevation. Beam width, beam separation and beam ratios are fixed for better sensitivity. One planets, these parameters are freed using the GAUSS * * * command, since the planets are marginally resolved. The beam-size is 56 $''$ at 86 GHz.

A typical sequence of single-dish flux reduction is the following:

FIL IN 'date'.BUR
FIL OUT 'flux-date'.BUR      !
@ PR:INIT_FLUX Teles Line    ! Initialize once
R Scan
...
R Scan      ! Repeat for all scans in the file
!
@ PR:INIT_FLUX Teles Line    ! Repeat for other frequencies/Telescopes
...
R Scan

The setup procedure PR:INIT_FLUX contains

! @ PR:INIT_FLUX Telescope Line
! Initialize a flux data reduction
LAS\SET TEL &1           ! Select Telescope 
LAS\SET LINE &2          ! Select Observed Line
LAS\SET TYPE CONTINUUM
LAS\SET ALIGN POSITION
LAS\SET ANGLE SECOND
DEVICE                   ! Enter graphics device
SIC\DEFINE REAL F
SAY "Enter LO1 frequency in GHz (0 if not known or variable)"
LET F
IF (F.GT.80.AND.F.LT.118) THEN
   Say "The beam-size is:" '86*56|F'  
   ANALYSE\METHOD CONTINUUM 86*56|F     ! Fix the beam width
ELSE
   ANALYSE\METHOD CONTINUUM             ! Let it free if frequency not known
ENDIF
SYMBOL R "SIC\@ PR:FLUX"

R is a symbol calling the reduction procedure PR:FLUX.CLASS

!
! CLASS : Reduce a Pointing cross scan to get flux measurements
!
! Calling sequence : @ PR:INIT_FLUX
! Then R Scan_Number (R = "@ PR:FLUX")
!
DEFINE INTEGER ISCAN
DEFINE LOGICAL PLANET
LET ISCAN &1
LAS\FIND/SCAN ISCAN
LET PLANET (SOURCE.EQ."JUPITER".OR.SOURCE.EQ."VENUS".OR.SOURCE.EQ."MARS".OR.-
SOURCE.EQ."SATURN") 
!
LAS\GET FIRST
LAS\GET NEXT
LAS\ACCUMULATE
SET MOD X -110 110
LAS\PLOT
SIC\IF PLANET THEN
   ANALYSE\GAUSS * * *
ELSE
   ANALYSE\GAUSS
ENDIF
ANALYSE\FIT
PAUSE   "WRITE the result if it seems OK"
LAS\GET NEXT
LAS\GET NEXT
LAS\ACCUMULATE
SET MOD X -110 230
LAS\PLOT
SIC\IF PLANET THEN
   ANALYSE\GAUSS * * *
ELSE
   ANALYSE\GAUSS
ENDIF
ANALYSE\FIT
PAUSE "WRITE the result if it seems OK"
SET MOD X -110 110

When all the reduction is finished, print the fit results from the output file

FIL IN 'flux-date'.BUR
FIND
PRINT FLUX/OUT 'bur*-frequency-date'.FIT

The Gaussian fit results are written in a special file (produced by the new command CLASS PRINT FLUX /OUTPUT Filename) which contains all the fit parameters, the antenna number, the signal and image frequencies, the gain USB/LSB and the elevation of the source.

This file is then directly analysed using ASTRO with the new language FLUX which corresponds to the commands described in section 4.