Embedded cosmic rays from accreting protostars can regulate the CO-to-H2 conversion factor to the Milky Way value for star-forming efficiencies above 2%, while the CI-to-H2 conversion factor varies by 1.2 dex depending on cosmic ray transport.
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The Astrochemical Impact of Cosmic Rays in Protoclusters II: CI-to-H$_2$ and CO-to-H$_2$ Conversion Factors
Embedded cosmic rays from accreting protostars can regulate the CO-to-H2 conversion factor to the Milky Way value for star-forming efficiencies above 2%, while the CI-to-H2 conversion factor varies by 1.2 dex depending on cosmic ray transport.