vice.toolkit.J21_sf_law.Sigma_g1¶
Type : float
Default : 5.0e+06
The lower of the two surface densities of gas at which there is a break
in the \(\dot{\Sigma}_\star - \Sigma_\text{gas}\) relation. Below
this value, the relation scales as a power-law with index set by the
attribute index1. Assumes units of \(M_\odot kpc^{-2}\).
Note
The value of this attribute should be smaller than that of
the attribute Sigma_g2, the larger of the two surface
densities of gas. Default values are chosen based on the aggregate
data from Bigiel et al. (2010) [1] and Leroy et al. (2013) [2]
presented in Krumholz et al. (2018) [3].
Example Code¶
>>> import vice
>>> mw = vice.milkyway(name = "example")
>>> mw.zones[0].tau_star.Sigma_g1
5.0e+06
>>> for i in range(mw.n_zones):
>>> mw.zones[i].tau_star.Sigma_g1 = 6.0e+06
>>> mw.zones[0].tau_star.Sigma_g1
6.0e+06
