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Molecular Abundances in the Sgr a Molecular Cloud

  • Y. C. Minh (a1), W. M. Irvine (a2) and P. Friberg (a3) (a4)

Abstract

We have obtained column densities for HCO+, HCO, HCS+, C3H2, HC5N, SiO, OCS, HCOOH, CH3CH2 OH, and CH3CCH toward Sgr A. The fractional abundance of SiO relative to molecular hydrogen in Sgr A is comparable to that for the Orion plateau, ~ 10−7 − 10−8, which may be a typical value for hot clouds. The abundances of HCO, CH3CH2OH and CH3CCH all appear to be enhanced relative to other molecular clouds suc as Sgr B2.

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References

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Gusten, R., Walmsley, C.M. Pauls, T., 1981, A&A 103, 197
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Minh, Y.C., Irvine, W.M., Friberg, P., 1991b, submitted to A&A
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