Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943701m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #437.01
Physics
Scientific paper
The Orion KL nebula is the prototype of high-mass star forming region and one of the best studied regions in our galaxy. Many spectral line surveys of this region have been performed over the last 20 years, revealing a spectacularly prolific line spectrum. The molecular inventory of Orion KL, which includes complex molecular species, is the result of the interaction of the newly formed stars with their environment and grain mantle evaporation. However the chemical complexity of Orion cannot be completely understood without the study of its spatial distribution.
After the completion of the spectral line survey of Orion-IRc2 in the full frequency domain of the IRAM 30m telescope (80-280 GHz), we started a mapping line survey at 1mm over a region 2x2' around Orion-IRc2. With the 9-11'' beam size of the 30m telescope at 1mm, the different components of Orion (Extended and Compact Ridge, Hot Core, and Plateau) can be resolved, and a deep view of the physical and chemical conditions of the cloud as a function of position can be obtained. In this poster we present the first results of this 2D line survey (200-250 GHz completed to date). The data reveal the different emission distributions and peak positions depending on the observed molecular species, providing important clues to its chemical formation pathways.
By obtaining a systematic view of the spatial distribution of the molecular emission in Orion, we will be in the best conditions to improve our understanding of the physics and chemistry of high-mass star forming regions. The combination of the IRAM surveys with Herschel/HIFI data from the Guaranteed Time Key Program ``Herschel observations of EXtra-Ordinary Sources (HEXOS)'', and its possible use as zero spacing data for future interferometric observations (e.g. with IRAM PdBI or ALMA), demonstrates the legacy nature of this still on-going project.
Bell Tom
Cernicharo Jose
Esplugues G. B.
Guélin Michel
Marcelino Nuria
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