APEX telescope observations of hydrides

Details APEX telescope observations of hydrides APEX telescope observations of hydrides

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.387w&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

Hydrides are key ingredients of interstellar chemistry since they are the initial products of chemical networks that lead to the formation of more complex molecules. The fundamental rotational transitions of light hydrides fall into the submillimeter wavelength range. Using the APEX telescope, we observed the long sought hydrides SH+ and OH+ in absorption against the strong continuum source Sagittarius B2(M). Both, absorption from Galactic center gas as well as absorption from diffuse clouds in intervening spiral arms in a large velocity range are observed. The detected absorption of a continuous velocity range on the line-of-sight shows these hydrides to be an abundant component of diffuse clouds. In addition, we used the strongest submillimeter dust continuum sources in the inner Galaxy to serve as background candles for a systematic census of these hydrides in diffuse clouds and massive star forming regions of our Galaxy and initial results of this survey are presented. For this survey, the CHAMP+ array receiver as well as the MPIfR THz receiver was used. We will discuss the scientific potential of the first THz atmospheric window from 1.0 to 1.1 THz for observations from the Chajnantor high site.

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