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Ams: We study the 12C/13C isotopic ratio in the disk of the central molecularzone and in the halo to trace gas accretion toward the Galactic center regionin the Milky Way. Methods: Using the IRAM 30m telescope, we observe the J=1-0rotational transition of HCO+, HCN, HNC and their 13C isotopic substitutions inorder to measure the 12C/13C isotopic ratio. We observe 9 positions selectedthroughout the Galactic center region, including clouds at high latitude;locations where the X1 and X2 orbits associated with the barred potential areexpected to intersect; and typical Galactic center molecular clouds. Results:We find a systematically higher 12C/13C isotopic ratio (>40) toward the haloand the X1 orbits than for the Galactic center molecular clouds (20-25). Ourresults point out to molecular gas which has undergone a different degree ofnuclear processing than that observed in the gas towards the inner Galacticcenter region. Conclusions: The high isotopic ratios are consistent with theaccretion of the gas from the halo and from the outskirts of the Galactic disk.

Tracing gas accretion in the Galactic center using isotopic ratios