Chris Beaumont's IDL Library

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result = mwdens(l, b, d, frac=frac)

This function returns the number density of stars in the Milky Way, as a function of galactic coordinates. It models a circularly symmetric thin and thick disk. The parameters describing these disks come from Bochanski et al. 2009.

Return value

The number density of stars as a function of (l,b,d). This has been approximately normalized, but the normalization factor may not be very accurate (n = .048 stars pc^-3 at the sun)


l in required

The galactic longitude. Scalar or vector in DEGREES

b in required

The galatic latitude. Scalar or vector in DEGREES.

d in required

The distance from the sun. Scalar or vector in parsecs.



Author information


Sep 2009: Written by Chris Beaumont. Oct 2009: Galaxy parameters updated. Calling sequence changed. cnb. Nov 2009: Added normalization constant. cnb. Dec 2009: Removed galaxy truncation

File attributes

Modifcation date: Mon Mar 22 16:17:13 2010
Lines: 108