palRvgalc
palRvgalc
- Velocity component in a given direction due to the rotation
of the Galaxy
- Description:
- This function returns the Component of dynamical LSR motion in
the direction of R2000,D2000. The result is
ve when the dynamical
LSR is receding from the given point on the sky.
- Invocation:
- double palRvgalc( double r2000, double d2000 )
- Arguments:
-
-
r2000 = double (Given)
-
J2000.0 mean RA (radians)
-
d2000 = double (Given)
-
J2000.0 mean Dec (radians)
- Returned Value:
-
-
Component of dynamical LSR motion in direction R2000,D2000 (km/s).
-
- Notes:
- The Local Standard of Rest used here is a point in the
vicinity of the Sun which is in a circular orbit around
the Galactic centre. Sometimes called the "dynamical" LSR,
it is not to be confused with a "kinematical" LSR, which
is the mean standard of rest of star catalogues or stellar
populations.
-
Reference
- The orbital speed of 220 km/s used here comes from Kerr &
Lynden-Bell (1986), MNRAS, 221, p1023.