HCO+ Clouds in the SGR b2 Region

Details HCO+ Clouds in the SGR b2 Region HCO+ Clouds in the SGR b2 Region

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jass...21..233m&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 21, no. 4, 233-242

Astronomy and Astrophysics

Astronomy

Sm, Interstellar Molecule: Hco+, Galactic Center, Sgr B2

Scientific paper

The HCO^+ 1--0 transition line was observed toward the Sgr B2 region in our Galactic center. We found that there exist two large-scale velocity structures of vlsr ˜50 and ˜100 km s-1, which are thought to interact with each other. A new gas clump ``OF28 Cloud" (`Odenwald & Fazio FIR 38' Cloud), showing different chemical and kinematical properties with the Sgr B2(M) cloud, was found in the 50 km s-1 gas component. Toward the core of this component, we derive the HCO^+ total column density, N(HCO^+) = (2-5)×1014 cm-2 and the mass M =1 × 106 M&sun;, by estimating its size, ˜15pc, from the half-power width of this component. We also found that there is a highly turbulent component in this region in the velocity range of about 100 km s-1. The column density of this component is N(HCO^+) = 1 × 1013 cm-2. The HCO^+ in this region may form effectively by the reaction between C^+ and OH, which are the elements whose abundances increase rapidly in shocked region.

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