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Published October 10, 2015 | Published
Journal Article Open

CSO and Carma Observations of L1157. I. A Deep Search for Hydroxylamine (NH_2OH)


A deep search for the potential glycine precursor hydroxylamine (NH_2OH) using the Caltech Submillimeter Observatory (CSO) at λ = 1.3 mm and the Combined Array for Research in Millimeter-wave Astronomy at λ = 3 mm is presented toward the molecular outflow L1157, targeting the B1 and B2 shocked regions. We report non-detections of NH_2OH in both sources. We perform a non-LTE analysis of CH_3OH observed in our CSO spectra to derive the kinetic temperatures and densities in the shocked regions. Using these parameters, we derive upper limit column densities of NH_2OH of ≤1.4 × 10^(13) cm^(−2) and ≤1.5 × 10^(13) cm^(−2) toward the B1 and B2 shocks, respectively, and upper limit relative abundances of N_(NH_2OH)/N_H_2 ≤ 1.4 x 10^(-8) and ≤1.5 × 10^(−8), respectively.

Additional Information

© 2015. The American Astronomical Society. Received 2015 April 13; accepted 2015 September 11; published 2015 October 9. B.A.M. gratefully acknowledges funding by an NSF Graduate Research Fellowship during the initial portions of this work. The authors thank the anonymous referee for comments that increased the quality of this work. We thank S. Radford for support of the CSO observations. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Portions of this material are based upon work at the Caltech Submillimeter Observatory, which was operated by the California Institute of Technology under cooperative agreement with the National Science Foundation (AST-0838261). Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation.

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August 22, 2023
August 22, 2023