with_H0

astropy.units.equivalencies.with_H0(H0=None)[source]

Convert between quantities with little-h and the equivalent physical units.

Parameters
H0None or Quantity [‘frequency’]

The value of the Hubble constant to assume. If a Quantity, will assume the quantity is H0. If None (default), use the H0 attribute from the default astropy.cosmology cosmology.

References

For an illuminating discussion on why you may or may not want to use little-h at all, see https://arxiv.org/pdf/1308.4150.pdf