SLA_RVGALC

RV Corrn to Galactic Centre

ACTION:

Velocity component in a given direction due to the rotation of the Galaxy.

CALL:

R = sla_RVGALC (R2000, D2000)

GIVEN:

RETURNED:

NOTES:

(1)

Sign convention: the result is positive when the LSR is receding from the given point on the sky.

(2)

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.

(3)

The dynamical LSR velocity due to Galactic rotation is assumed to be 220 km s${}^{-1}$ towards $l^{II}=90^{\circ }$, $b^{II}=0$.

REFERENCE:

Kerr & Lynden-Bell (1986), MNRAS, 221, p1023.