期刊
ASTROPHYSICAL JOURNAL
卷 590, 期 1, 页码 314-332出版社
UNIV CHICAGO PRESS
DOI: 10.1086/374890
关键词
astrochemistry; ISM : abundances; ISM : individual (G34.3+0.2, IRAS 16293-2422, L1448-C, M17-SW, NGC 1333 IRAS 4, NGC 2024 FIR 5, Orion KL, Serpens SMM 1, W3, W49 A); ISM : molecules
We have surveyed 12 Galactic hot molecular cores for interstellar acetic acid (CH3COOH). This is the most extensive search for acetic acid to date. We have detected a new source of acetic acid toward the high-mass hot molecular core source G34.3+0.2. Using a temperature range between 70 and 185 K, we find a CH3COOH column density range of (0.77-1.64) x 10(15) cm(-2) toward G34.3+ 0.2. This gives a relative CH3COOH/HCOOCH3 abundance ratio of similar to3.3 x 10(-2), which is comparable to the abundance ratio of (3-6) x 10(-2) found toward Sgr B2(N-LMH) and W51e2 by Remijan and colleagues. All currently known acetic acid sources are within 7 kpc of the Galactic center. Furthermore, our survey suggests that hot molecular cores that have a mass range between 200 and 2000 M-. and do not show a distinct differentiation between O and N chemistry may be the best places to search for acetic acid and the structurally similar biologically important molecule glycine.
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