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./
kdist.pro
topkdist
coordinate systems
result = kdist(longitude, velocity [, radians=radians] [, debug=debug])
This function calculates the near and far kinematic distances for a given galactic longitude and radial velocity. The calculation uses the Galactic rotaion model of Brand and Blitz 1993, A&A, 275 : 67.
Currently only computes distances for objects in the inner galaxy.
Return value
The two element vector [near_distance, far_distance] in kpc.
Parameters
- longitude in required
Galactic Longitude. Currently must be in the range [-180, 180] in degrees.
- velocity in required
Radial velocity in km/s
Keywords
- radians in optional
If set, input Longitude is in radians
- debug in optional
If set, produce debugging plots / information
Author information
- History:
Written by: Chris Beaumont, June 2008. June 23, 2008: Changed name from kinematic_distance to kdist. cnb June 23, 2008: Fixed bug in modding l with 2 pi. cnb July 17, 2008: Removed degrees keyword. Added radians. cnb July 17, 2008: Changed things so that, if l is a variable, it isn't modified March 18, 2009: Changed theta_0 and v_sol to reflect arxiv 0902.3913 March 20, 2009: Changed minor typo in value of a1. Added /DEBUG keyword
File attributes
| Modifcation date: | Mon Mar 19 09:58:19 2012 |
| Lines: | 117 |