Tracing gas accretion in the Galactic center using isotopic ratios

  title={Tracing gas accretion in the Galactic center using isotopic ratios},
  author={Denise Riquelme and M. A. Amo-Baladr{\'o}n and Jes{\'u}s Mart{\'i}n-Pintado and Rainer Mauersberger and S. Mart{\'i}n and Leonardo Bronfman},
  journal={Astronomy and Astrophysics},
Aims. We study the 12 C/ 13 C isotopic ratio in the disk of the central molecular zone and in the halo to trace gas accretion toward the Galactic center region in the Milky Way. Methods. Using the IRAM 30m telescope, we observed the J = 1−0 rotational transition of HCO + ,H CN, HNC, and their 13 C isotopic substitutions in order to measure the 12 C/ 13 C isotopic ratio. We observed 9 positions selected throughout the Galactic center region, including clouds at high latitude, locations where the… 

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