摘要: Abstract Observations of acetaldehyde (CH 3 CHO) in a survey nine star-forming regions are presented. Emission is clearly detected from both the A and E symmetry states 4 04 –3 03 5 05 –4 transitions. Both range measured CH CHO column densities (∼4×10 12 –10 14 cm −2 ), derived fractional abundances, good agreement with other studies. The origin interstellar its structural isomers discussed light this work previous observations. It concluded that specific grain-surface chemistries responsible for production C 2 H O compounds related organic molecules. Possible observational tests to distinguish between different surface pathways suggested.
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