definition of GFM_StellarFormationTime

Guang Yang
  • 20 Jul '20


From, I find the definition of GFM_StellarFormationTime is "The exact time (given as the scalefactor) when this star was formed".

I'm confused by this definition. How to convert GFM_StellarFormationTime to cosmic time?


Dylan Nelson
  • 21 Jul '20


It is the scale factor a. To convert to a "lookback time" or "age of the universe" (e.g. in Gyr), you need to do the relevant cosmological calculations, e.g. as implemented in astropy.cosmology.age().

Guang Yang
  • 21 Jul '20

Yeah, that makes sense. Thanks, Dylan!

  • Page 1 of 1