Z2q: Metal to Ionisation Conversion

In asgr/ProSpect: Professional Spectral Analysis Package

Metal to Ionisation Conversion

Description

Uses the Z[gas] to ionisation conversion function suggested in Orsi (2014).

Usage

Z2q(Zgas = 0.02, q0 = 2.8e+07, g0 = -1.3, Z0 = 0.012)

Arguments

Zgas	Numeric scaler; gas phase metallicity.
q0	Numeric scaler; reference ionisation parameter. The ionization parameter is the ratio of the incident ionizing photon flux (S[H0]) to the gas density (n), q=S[H0]/n.
g0	Numeric scalar; power law scaling of relationship.
Z0	Numeric scaler; reference Z[gas], where gas with metallicity Z0 has ionisation parameter q0.

Details

Mapping given by: q(Z) = q0(Z/Z0)^g0.

This function probably will not be used by people directly, but it is used inside of emissionLines to make a sensible mapping when q is not specified.

Value

Output is numeric scalar value of q with units cm/s.

Author(s)

Aaron Robotham

References

Orsi et al, 2014, MNRAS, 443, 799

See Also

emissionLines

Examples

# For solar metallicity:

Z2q(0.02)

asgr/ProSpect documentation built on Feb. 21, 2025, 1:43 a.m.