Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.4104h&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #41.04; Bulletin of the American Astronomical Society, Vol. 33, p.841
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of NO and N2O have been conducted at 2mm towards the Sgr B2 complex using the Kitt Peak 12m telescope with a beam size of 42 arcsec. The J= 6 -> 5 transition of N2O and the 2Pi1/2^+, J= 3/2 -> 1/2 line of NO were mapped over a 5 by 2 \arcmin area, which contained the core sources Sgr B2(N), Sgr B2(M), and Sgr B2(S). The NO emission was found to be extended over the whole region with local maximum at the cloud cores - a distribution very similar to that of HNO. In contrast, N2O appeared to be concentrated at Sgr B2(N), where its extent was identical to a high energy transition of methanol (JK= 140 -> 14-1 E). Because this CH3OH line can only be excited at high temperatures, it is very likely that N2O is formed from gas phase reactions with activation energy barriers. This observational result is supported by gas-phase kinetics. The only viable route leading to N2O is the reaction NO + NH -> N2O + H, which has a strongly temperature dependent rate.
Apponi Aldo Joseph
Halfen DeWayne T.
Ziurys Lucy M.
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