1.4.1.0 measures.radialvelocity

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measures.radialvelocity - Function

1.4.1 define a radialvelocity measure

Description

radialvelocity defines a radialvelocity measure from the CLI. It has to specify a reference code, radialvelocity quantity value (see introduction for the action on a scalar quantity with either a vector or scalar value),

and optionally it can specify an offset, which in itself has to be a radialvelocity. Allowable reference codes are: LSRK LSRD BARY GEO TOPO GALACTO LGROUP CMB.
Note that additional ones may become available. Check in CASA with:

print "\t----\t radialvelocity Ex 1 \t----"
print me.listcodes(me.radialvelocity())
# Out[17]:
#{’extra’: [],
# ’normal’: [’LSRK’, ’LSRD’, ’BARY’, ’GEO’, ’TOPO’, ’GALACTO’,
# ’LGROUP’, ’CMB’]}

The radialvelocity quantity values should be given as velocity.

Arguments


Inputs
rf	reference code
	allowed:	string
	Default:	LSRK
v0	radial velocity
	allowed:	any
	Default:	variant
off	optional offset radialvelocity measure
	allowed:	record
	Default:

Returns
record

Example

print "\t----\t radialvelocity Ex 2 \t----"
print me.radialvelocity(’lsrk’,’20km/s’)
# Out[18]:
#{’m0’: {’value’: 20000.0, ’unit’: ’m/s’},
# ’refer’: ’LSRK’,
# ’type’: ’radialvelocity’}

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