Extragalactic H2 and its variable relation to CO

Details Extragalactic H2 and its variable relation to CO Extragalactic H2 and its variable relation to CO

2000-01-14

arxiv.org/abs/astro-ph/0001250v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, in: "H2 in Space", Cambridge University Press, ed. F. Combes and G. Pineau des Forets

Scientific paper

A steep metallicity dependence of the CO-to-H2 conversion factor X of the
form log X = 12.2 - 2.5 log[O]/[H], based on a sample of 20 (extra)galactic
determinations, is presented and discussed. The apparently less steep
dependence found from millimeter interferometer observations is explained
within the context of photon-dominated regions.

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