# A ACETIC ACID SURVEY TOWARD HIGH- AND LOW-MASS STAR FORMING REGIONS

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 Title: A ACETIC ACID SURVEY TOWARD HIGH- AND LOW-MASS STAR FORMING REGIONS Creators: Shiao, Y. S.; Looney, L. W.; Snyder, L. E.; Friedel, D. N.; Remijan, A. J. Issue Date: 2008 Publisher: Ohio State University Abstract: We have used the Combined Array for Research in Millimeter-wave Astronomy (CARMA) to conduct a survey of acetic acid (CH$_{3}$COOH) 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 CH$_{3}$COOH transitions are the $10_{*,10}-9_{*,9}$ E and A lines. We have detected ($>$3 $\sigma$ level) these two lines in G19.61-0.23. The abundance ratio of CH$_{3}$COOH to its isomer, methyl formate (HCOOCH$_{3}$), is comparable to other CH$_{3}$COOH sources. However, the CH$_{3}$COOH 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 CH$_{3}$COOH detection in IRAS 16293-2422 reported by Cazaux et al., we should have detected the two lines. Therefore, we suggest that the CH$_{3}$COOH detection in IRAS 16293-2422 is still uncertain. \vspace{0.1in} We acknowledge support from the Laboratory for Astronomical Imaging at the University of Illinois and NSF grant AST-0540459. Description: Author Institution: Department of Astronomy, University of Illinois; at Urbana-Champaign, IL 61801; National Radio Astronomy Observatory, Charlottesville, VA 22903 URI: http://hdl.handle.net/1811/33488 Other Identifiers: 2008-RB-04