Chemical and physical conditions at the disk-halo interaction places in the Galactic center region

Details Chemical and physical conditions at the disk-halo interaction places in the Galactic center region Chemical and physical conditions at the disk-halo interaction places in the Galactic center region

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.315r&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

Scientific paper

We study the disk-halo interaction, in the context of orbits and Giant Molecular loops (GMLs) in the Galactic center region. From a large scale survey in the central kpc in SiO(J=2-1), HCO^+(J=1-0) and H13CO^+ (J=1-0), we identify shock regions traced by SiO emission. We selected 9 positions throughout the Galactic center region, including clouds at high latitude, locations where the X1 and X2 orbits associated with the barred potential are expected to intersect, and typical Galactic center molecular clouds. Using the IRAM 30m telescope, we study the 12C/13C isotopic ratio, observing the J=1-0 rotational transition of HCO+, HCN, HNC, and their 13C isotopic substitutions. We find a systematically higher 12C/13C isotopic ratio (>40) toward the halo and the X1 orbits than for the Galactic center molecular clouds (20-25). Our results point to molecular gas that has undergone a different degree of nuclear processing than observed in the gas towards the inner Galactic center region. The high isotopic ratios are consistent with the accretion of the gas from the halo and from the outskirts of the Galactic disk.

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