fastar.imf.named_imf.bimodal

Bimodal IMF shape as defined in Vazdekis et al. 1996 https://ui.adsabs.harvard.edu/abs/1996ApJS..106..307V

This shapes aims to generalize a Kroupa-like IMF, with two segments connected through a smooth spline.

The version coded in FASTAR generalizes the bimodal IMF with the possibility of a variable low-mass end slope.

Functions

bimodal(mass, params)	Wrapper for the bimodal IMF using a parameter dictionary.
bimodal_raw(mass[, m_min, m_max, alpha_B, ...])	Returns the normalized bimodal IMF evaluated at mass, with the low-mass end scaling as M^{-beta_B} and the high-mass as M^{-alpha_B}.

fastar.imf.named_imf.bimodal.bimodal(mass, params)

Wrapper for the bimodal IMF using a parameter dictionary.

Parameters:

• mass (array-like) – Stellar mass or array of masses.

• params (dict) – Dictionary of parameters to pass to bimodal_raw.

Returns:

Normalized IMF values.

Return type:

jnp.ndarray or float

fastar.imf.named_imf.bimodal.bimodal_raw(mass, m_min=0.1, m_max=100.0, alpha_B=2.3, beta_B=1.0, bicl=0.2, bicp=0.4, bich=0.6)

Returns the normalized bimodal IMF evaluated at mass, with the low-mass end scaling as M^{-beta_B} and the high-mass as M^{-alpha_B}.

Parameters:

• mass (array-like) – Stellar mass or array of masses.

• m_min (float, optional) – Lower mass limit. Default is 0.1.

• m_max (float, optional) – Upper mass limit. Default is 100.0.

• alpha_B (float, optional) – High-mass end slope (Milky Way-like = 2.3)

• beta_B (float, optional) – Low-mass end slope (Milky Way-like = 1.0)

• bicl (float, optional) – End of the low-mass end regime. Default is 0.2

• bicp (float, optional) – Turning point. Default is 0.4

• bich (float, optional) – End of the high-mass end regime. Default is 0.6

Returns:

Normalized IMF values.

Return type:

jnp.ndarray or float