Y.-S. SHIAO, L. W. LOONEY, L. E. SNYDER, D. N. FRIEDEL, Department of Astronomy, University of Illinois at Urbana-Champaign, IL 61801; A. J. REMIJAN, National Radio Astronomy Observatory, Charlottesville, VA 22903.
We have used the Combined Array for Research in Millimeter-wave Astronomy (CARMA) to conduct a survey of acetic acid (CH3COOH) at 3 mm wavelengths toward the hot core G19.61-0.23 and the two deeply embedded low-mass protostars IRAS 16293-2422 and NGC 1333 IRAS 4. The observed CH3COOH transitions are the 10_*,10-9_*,9 E and A lines. We have detected (>3 level) these two lines in G19.61-0.23. The abundance ratio of CH3COOH to its isomer, methyl formate (HCOOCH3), is comparable to other CH3COOH sources. However, the CH3COOH lines in IRAS 16293-2422 and NGC 1333 IRAS 4 are not detected in our observations. We set upper limits for the column densities for each source. Based on the CH3COOH detection in IRAS 16293-2422 reported by Cazaux et al., we should have detected the two lines. Therefore, we suggest that the CH3COOH detection in IRAS 16293-2422 is still uncertain.
.1in We acknowledge support from the Laboratory for Astronomical Imaging at the University of Illinois and NSF grant AST-0540459.