vice.toolkit.J21_sf_law.molecular_index

Type : float

Default : 0.5

The power-law index on the time-dependence of the molecular gas star formation efficiency timescale. The normalization will be set such that the value at \(t\) = 12 Gyr is equal to the value of the attribute present_day_molecular.

Note

The default value is chosen based on the redshift dependence of \(\tau_\text{mol}\) reported by Tacconi et al. (2018) [1] and a redshift-time relation accurate for \(z \lesssim 3\). See discussion in section 2 of Johnson et al. (2021) [2].

Example Code

>>> import vice
>>> mw = vice.milkyway(name = "example")
>>> mw.zones[0].tau_star.molecular_index
0.5
>>> for i in range(mw.n_zones):
>>>     mw.zones[i].tau_star.molecular_index = 0.6
>>> mw.zones[0].tau_star.molecular_index
0.6