NRAO Home > CASA > CASA Toolkit Reference Manual
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’}  
 

__________________________________________________________________


More information about CASA may be found at the CASA web page

Copyright 2016 Associated Universities Inc., Washington, D.C.

This code is available under the terms of the GNU General Public Lincense


Home | Contact Us | Directories | Site Map | Help | Privacy Policy | Search