HerschelHIFI Observations of the Sgr A +50 Km S-1Cloud

Aa. Sandqvist,B. Larsson,Å. Hjalmarson,P. Encrenaz,M. Gerin,P. F. Goldsmith,D. C. Lis,R. Liseau,L. Pagani,E. Roueff,S. Viti

Astronomy &amp Astrophysics（2015）

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摘要

Context. The Herschel Oxygen Project (HOP) is an open time key program, awarded 140 h of observing time to search for molecular oxygen (O2) in a number of interstellar sources. To date O2 has definitely been detected in only two sources, namely ρ Oph A and Orion, reflecting the extremely low abundance of O2 in the interstellar medium.

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