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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2012

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

Résumé

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.

Dates et versions

hal-00747028 , version 1 (30-10-2012)

Identifiants

Citer

T.-C. Peng, L. A. Zapata, F. Wyrowski, R. Güsten, K. M. Menten. Mid-J CO emission from the Orion BN/KL explosive outflow. Astronomy and Astrophysics - A&A, 2012, 544, pp.id.L19. ⟨10.1051/0004-6361/201219937⟩. ⟨hal-00747028⟩

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