vhel_to_vgsr¶

gala.coordinates.vhel_to_vgsr(coordinate, vhel, vcirc=<Quantity 220.0 km / s>, vlsr=<Quantity [ 10., 5.25, 7.17] km / s>)[source]¶

Convert a velocity from a heliocentric radial velocity to the Galactic standard of rest (GSR).

Parameters:

coordinate : SkyCoord

An Astropy SkyCoord object or anything object that can be passed to the SkyCoord initializer.

vhel : Quantity

Barycentric line-of-sight velocity.

vcirc : Quantity

Circular velocity of the Sun.

vlsr : Quantity

Velocity of the Sun relative to the local standard of rest (LSR).

Returns:

vgsr : Quantity

Radial velocity in a galactocentric rest frame.