1.4.1.0 measures.torestfrequency

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measures.torestfrequency - Function

1.4.1 convert a frequency and doppler measure to a rest frequency

Description

torestfrequency will convert a frequency measure and a doppler measure (e.g. obtained from another spectral line with a known rest frequency) to a rest frequency.

Arguments


Inputs
v0	frequency reference type
	allowed:	record
	Default:
d0	doppler measure value
	allowed:	record
	Default:

Returns
record

Example

print "\t----\t torestfrequency Ex 1 \t----"
dp = me.doppler(’radio’, ’2196.24984km/s’)  # a measured doppler speed
print dp
#{’m0’: {’value’: 2196249.8399999999, ’unit’: ’m/s’},
# ’refer’: ’RADIO’,
# ’type’: ’doppler’}
f = me.frequency(’lsrk’,’1410MHz’)    # a measured frequency
print f
#{’m0’: {’value’: 1410000000.0, ’unit’: ’Hz’},
# ’refer’: ’LSRK’,
# ’type’: ’frequency’}
print me.torestfrequency(f, dp)                   # the corresponding rest frequency
#{’m0’: {’value’: 1420405751.7854364, ’unit’: ’Hz’},
# ’refer’: ’REST’,
# ’type’: ’frequency’}

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