Search for HOOH in Orion
Ren\'e Liseau, Bengt Larsson

TL;DR
This study investigates the presence of hydrogen peroxide (HOOH) in the Orion Molecular Cloud OMC A, aiming to understand its correlation with molecular oxygen and its role in star-forming regions, but the detection remains inconclusive due to spectral complexity.
Contribution
First search for HOOH in Orion OMC A, providing observational data and analysis of its potential correlation with O2 in star-forming clouds.
Findings
Detected HOOH emission at some transitions with >4 sigma significance.
High spectral line density complicates HOOH identification in Orion.
Detection status remains undecided due to possible contamination.
Abstract
Context: The abundance of key molecules determines the level of cooling that is necessary for the formation of stars and planetary systems. In this context, one needs to understand the details of the time dependent oxygen chemistry, leading to the formation of molecular oxygen and water. Aims: We aim to determine the degree of correlation between the occurrence of O2 and HOOH (hydrogen peroxide) in star-forming molecular clouds. We first detected O2 and HOOH in the rho Ophiuchi cloud (core A), we now search for HOOH in Orion Molecular Cloud OMC A, where O2 has also been detected. Methods: We mapped a 3 arcmin times 3 arcmin region around Orion H2-Peak 1 with the Atacama Pathfinder Experiment (APEX). In addition to several maps in two transitions of HOOH, viz. 219.17 GHz and 251.91 GHz, we obtained single-point spectra for another three transitions towards the position of maximum…
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