Distribution of SI II in the Galactic center

Details Distribution of SI II in the Galactic center Distribution of SI II in the Galactic center

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..803g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 803-808.

Astronomy and Astrophysics

Astrophysics

11

Abundance, Galactic Nuclei, Line Spectra, Milky Way Galaxy, Molecular Clouds, Silicon, Carbon, Forbidden Transitions, Ionized Gases, Neutral Gases, Optical Thickness, Oxygen, Photodissociation

Scientific paper

A map of the Galactic center region in the forbidden Si II 34.8-micron line is presented. The line emission arises from within the photodissociation region (PDR) associated with the neutral gas ring surrounding an ionized gas core confined within 2 pc of the Galactic center. Si II is a useful probe of the inner regions of the ring since it is always optically thin. The Si II data, when analyzed in conjunction with O I, C II, and molecular measurements, outlines the transition region between the PDR and the surrounding molecular cloud. The Si II emission is found to extend beyond that of the O II into the neutral gas ring. Although the interpretation is not unique, the data are consistent with a constant gas-phase abundance of silicon within the inner part of the PDR while the gaseous silicon is depleted by molecule formation in the transition region.

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