Interstellar SiN

Details Interstellar SiN Interstellar SiN

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...412l..15s&link_type=abstract

Astronomy and Astrophysics, v.412, p.L15-L18 (2003)

Astronomy and Astrophysics

Astrophysics

5

Astrochemistry, Line: Identification, Ism: Abundances, Ism: Molecules, Ism: Individual Objects: Sgrb2(M), Radio Lines: Ism

Scientific paper

We report the detection of the silicon nitride (SiN) N=2-1, J=5/2-3/2 transition toward SgrB2(M), in absorption. Although it has been seen in a circumstellar envelope before, this is the first time this molecule has been detected in interstellar space. We estimate a column density of (1-2) x 1013 cm-2, which is a factor of 20-50 lower than that of silicon monoxide (SiO) toward this source. It is likely that this molecule, like SiO and FeO, is created by gas-phase chemistry after refractory elements, previously locked up in grain cores, have been released by sputtering in shocks.

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