GMF G214.5-1.8 as traced by CO: I -- cloud-scale CO freeze-out as a result of a low cosmic-ray ionisation rate

S. D. Clarke, V. A. Makeev, Á. Sánchez-Monge +6

We present an analysis of the outer Galaxy giant molecular filament (GMF) G214.5-1.8 (G214.5) using IRAM 30m data of ${}^{12}$CO, ${}^{13}$CO and C${}^{18}$O. We find that the ${}^{12}$CO…