PENG, T.-C.; ZAPATA, L. A.; WYROWSKI, F.; GÜSTEN, R.; MENTEN, K. M.

doi:10.1051/0004-6361/201219937

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PENG, T.-C.
FORMATION STELLAIRE 2012

ZAPATA, L. A.

WYROWSKI, F.
Max-Planck-Institut für Radioastronomie [MPIFR]

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Astronomy and Astrophysics - A&A. 2012, vol. 544, p. id.L19

EDP Sciences

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High spatial resolution low-J 12CO observations have shown that the wide-angle outflow seen in the Orion BN/KL region correlates with the famous H2 fingers. Recently, high-resolution large-scale mappings of mid- and higher-J CO emissions have been reported toward the Orion molecular cloud 1 core region using the APEX telescope. Therefore, it is of interest to investigate this outflow in the higher-J 12CO emission, which is likely excited by shocks. The observations were carried out using the dual-color heterodyne array CHAMP+ on the APEX telescope. The images of the Orion BN/KL region were obtained in the 12CO J=6-5 and J=7-6 transitions with angular resolutions of 8.6 and 7.4 arcsec, respectively. The results show a good agreement between our higher-J 12CO emission and SMA low-J 12CO data, which indicates that this wide-angle outflow in Orion BN/KL is likely the result of an explosive event that is related to the runaway objects from a dynamically decayed multiple system. From our observations, we estimate that the kinetic energy of this explosive outflow is about 1-2x10^47 erg. In addition, a scenario has been proposed where part of the outflow is decelerated and absorbed in the cloud to explain the lack of CO bullets in the southern part of BN/KL, which in turn induces the methanol masers seen in this region.< Réduire

Mots clés en anglais

SM: molecules

HII regions

ISM: jets and outflows

radio lines: ISM

submillimeter: ISM

ISM: clouds

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Mid-J CO emission from the Orion BN/KL explosive outflow

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