Fig13_5 Star formation rates

Fig13_5 Star formation rates

Fig. 13.5 . The star formation rate, in solar masses per year per cubic Megaparsec or MĚ yr-1 Mpc-3, plotted as a function of redshift, z (bottom axis) and time since the beginning of the expanding universe (top axis), in units of 109 years, or a billion years and a Gyr. The rate of star formation peaked at a redshift of about 3, or roughly 2 billion years after the expansion began, and this rate has subsequently decreased as gravitation has pulled more material into stars.

Copyright 2010, Professor Kenneth R. Lang, Tufts University