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KDIST

KDIST

Name


  KDIST

Purpose


  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.

Category


  coordinate systems

Calling Sequence


  result=KDIST( longitude, velocity, [/RADIANS])

Inputs


  longitude: Galactic Longitude. Currently must be in the range [-180,
  180] in degrees.
  velocity: Radial velocity in km/s

Keyword Parameters


  RADIANS: If set, input Longitude is in radians
  DEBUG: If set, produce debugging plots / information

Outputs


  The two element vector [near_distance, far_distance] in kpc.

Restrictions


  Currently only computes distances for objects in the inner galaxy.

Modification 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



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