CSO and CARMA Observations of L1157. I. A Deep Search for Hydroxylamine (NH${}_2$OH)

Abstract

A deep search for the potential glycine precursor hydroxylamine (NH${}_2$OH) using the Caltech Submillimeter Observatory (CSO) at $\lambda =1.3$ mm and the Combined Array for Research in Millimeter-wave Astronomy (CARMA) at $\lambda =3$ mm is presented toward the molecular outflow L1157, targeting the B1 and B2 shocked regions. We report non-detections of NH${}_2$OH in both sources. We a perform non-LTE analysis of CH${}_3$OH observed in our CSO spectra to derive kinetic temperatures and densities in the shocked regions. Using these parameters, we derive upper limit column densities of NH${}_2$OH of $\le 1.4\times 10^{13}$~cm${}^{-2}$ and $\le 1.5\times 10^{13}$~cm${}^{-2}$ toward the B1 and B2 shocks, respectively, and upper limit relative abundances of $N_{N{H}_{2}OH}/N_{H_2}\le 1.4\times 10^{-8}$ and $\le 1.5\times 10^{-8}$, respectively.

arXiv commentAccepted in the Astrophysical Journal

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