The ALMA-PILS survey: First detection of nitrous acid (HONO) in the interstellar medium

  title={The ALMA-PILS survey: First detection of nitrous acid (HONO) in the interstellar medium},
  author={Audrey Coutens and Niels F. W. Ligterink and Jean Christophe Loison and Valentine Wakelam and Hannah Calcutt and Maria Nikolayevna Drozdovskaya and Jes K. J{\o}rgensen and Holger S. P. M{\"u}ller and Ewine F. van Dishoeck and Susanne F. Wampfler},
  journal={Astronomy \& Astrophysics},
Nitrogen oxides are thought to play a significant role as a nitrogen reservoir and to potentially participate in the formation of more complex species. Until now, only NO, N2O, and HNO have been detected in the interstellar medium. We report the first interstellar detection of nitrous acid (HONO). Twelve lines were identified towards component B of the low-mass protostellar binary IRAS 16293–2422 with the Atacama Large Millimeter/submillimeter Array, at the position where NO and N2O have… 

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