vice.toolkit.J21_sf_law.Sigma_g2¶
Type : float
Default : 2.0e+07
The larger 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 index2, and above it, it is assumed to be linear. Assumes
units of \(M_\odot kpc^{-2}\).
Note
The value of this attribute should be larger than that of the
attribute Sigma_g1, the smaller 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_g2
2.0e+07
>>> for i in range(mw.n_zones):
>>> mw.zones[i].tau_star.Sigma_g2 = 1.5e+07
>>> mw.zones[0].tau_star.Sigma_g2
1.5e+07
