## ./

# cnb_imf.pro

## topcnb_imf

Astrophysics

`result = cnb_imf(mass [, noturnover=noturnover] [, random=random] [, muench=muench] [, malpha0=malpha0])`

This function both evaluates the IMF at given mass, and returns masses drawn at random from the IMF. The functional form of the IMF is given by dN/dM ~ M^-alpha, where alpha = 0 for 0 < M / Msolar < .07 (Allen et al 2005) = 1.05 for .07 < M / Msolar < .5 (Kroupa et al 2002 ASPC..285...86K) = 2.35 for .5 < M / Msolar (Ibid)

### Return value

If mass is set, it returns a vector of imf(mass). If random is set, it returns a vector of masses drawn from the IMF distribution.

### Parameters

- mass in required
A set of masses at which to evaluate the IMF. Given in solar masses. If provided, the program returns imf(masses) as a scalar or vector. This function is not normalized

### Keywords

- noturnover in optional
If set, treat the full IMF as having alpha = 2.35. This cannot be used in conjunction with the RANDOM keyword

- random in optional
Set this to a number (nstars) to draw nstars from the IMF mass distribution. If this keyword is set, then the function returns the masses of the nstars drawn from the distribution.

- muench in optional
Use the first three terms of the power law imf given in equation 1 of Muench et al. 2002 (ApJ 573)

- malpha0 in optional
Manually specify the high mass value for alpha.

### Author information

- History:
April 2009: Written by Chris Beaumont May 2009: Added RANDOM keyword. cnb. June 2009: Added MUENCH keyword. cnb.

## File attributes

Modifcation date: | Mon Oct 25 14:50:15 2010 |

Lines: | 92 |