sdcal – ASAP SD calibration task – single dish task

Description

Task sdcal performs calibration for single-dish spectra. The parameter, calmode, defines calibration mode. The available calibration modes are ‘ps’ (for position switching with explicit reference scans), ‘otfraster’ (for raster OTF scan without explicit reference scans), ‘otf’ (for non-raster OTF scan without explicit reference scans, e.g, Lissajous, double circle), ‘fs’ (for frequency switching), ‘nod’ (beam switching), and ‘quotient’ (for position switching scans by ATNF telescopes). The task selects appropriate calbiration equation based on the value of calmode and telescope with which the data is taken. See below for details of calibration equation adopted in this task.

By setting calmode=’none’, one can run sdcal on already calibrated data for atmospheric optical depth correction.

Parameters

Title

Parameter	Default	Description
infile	''
antenna	int(0)
fluxunit	''	units of the flux ['K' or 'Jy'] (''=current)
telescopeparam	''
field	''
spw	''
scan	''
pol	''
calmode	'ps'	SD calibration mode ['ps', 'nod', 'otf', 'otfraster', 'fs', 'quotient' or 'none']
fraction	'10%'
noff	int(-1)	number of the OFF data to mark, e.g., 10 (-1 = use fraction instead of number)
width	float(0.5)
elongated	False	the observed area is elongated in one direction [True, False]
markonly	False
plotpointings	False	plot pointing directions for ON and OFF [True, False]
tau	float(0.0)
verify	False
outfile	''
outform	'ASAP'	output file format ['ASAP', 'MS2', 'ASCII', or 'SDFITS']
overwrite	False
plotlevel	int(0)

Parameter Explanations

infile

''

name of input SD dataset

antenna

int(0)

select an antenna name or ID, e.g, 'PM03' (only effective for MS input)

fluxunit

''

units of the flux (''=current)

telescopeparam

''

parameters of telescope for flux conversion (see examples in help)

field

''

select data by field IDs and names, e.g. '3C2*' (''=all)

spw

''

select data by IF IDs (spectral windows), e.g. '3,5,7' (''=all)

scan

''

select data by scan numbers, e.g, '21~23' ('' = all)

pol

''

select data by polarization IDs, e.g, '0,1' ('' = all)

calmode

'ps'

SD calibration mode

fraction

'10%'

fraction of the OFF data to mark as OFF spectra, e.g., '10%'

noff

int(-1)

number of the OFF data to mark (-1 = use fraction instead of number)

width

float(0.5)

width of the pixel for edge detection

elongated

False

the observed area is elongated in one direction

markonly

False

do calibration (False) or just mark OFF (True)

plotpointings

False

plot pointing direction for ON and OFF

tau

float(0.0)

the zenith atmospheric optical depth for correction (0. = no correction)

verify

False

interactively verify the results of calibration [True, False] (see description in help)

outfile

''

name of output file (See a WARNING in help)

outform

'ASAP'

output file format (See a WARNING in help)

overwrite

False

overwrite the output file if already exists [True, False]

plotlevel

int(0)

plot and summarize results (0=none) see description in help