Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1H021

The protostar OMC-2 FIR 4: Results from the CHESS Herschel/HIFI spectral survey

Kama, Mihkel (Leiden Observatory, Leiden, the Netherlands)
Lopez-Sepulcre, Ana (IPAG, Grenoble, France)
Ceccarelli, Cecilia (IPAG, Grenoble, France)
Dominik, Carsten (University of Amsterdam, Radboud University Nijmegen, the Netherlands)
Caux, Emmanuel (CNRS/IRAP/Universite de Toulouse, Toulouse, France)
Fuente, Asuncion (Observatorio Astronomico Nacional, Alcala de Henares, Spain)

The intermediate-mass protostar OMC-2 FIR 4 in Orion is the focus of several ongoing studies, including a CHESS key programme Herschel/HIFI spectral survey. In this poster, we review recent CHESS results on this source, including the properties of the central hot core, the presence of a compact outflow, the spatial variation of the chemical composition, and the discovery of a tenuous foreground cloud. The HIFI spectrum of FIR 4 contains 719 lines from 40 species and isotopologs. Cooling by lines detectable with our sensitivity contributes 2% of the total in the 480 to 1900 GHz range. The total line flux is dominated by CO, followed by H2O and CH3OH. Initial comparisons with spectral surveys of other sources will also be presented.

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