SIMBAD references

2004AJ....128..363S - Astron. J., 128, 363-374 (2004/July-0)

A new mid-infrared map of the BN/KL region using the Keck telescope.


Abstract (from CDS):

We present a new mid-infrared (12.5 µm) map of the BN/KL high-mass star-forming complex in Orion using the LWS instrument on Keck I. Despite poor weather we achieved nearly diffraction-limited images (FWHM=0".38) over a roughly 25''x25'' region centered on IRc2 down to a flux limit of ~250 mJy. Many of the known IR sources in the region break up into smaller subcomponents. We have also detected six new mid-IR sources. Nearly all of the sources are resolved in our mosaic. The near-IR source ``n'' is slightly elongated in the mid-IR along a northwest-southeast axis and perfectly bisects the double-peaked radio source ``L.'' Source n has been identified as a candidate for powering the large IR luminosity of the BN/KL region (L=105 L). We postulate that the 12 µm emission arises in a circumstellar disk surrounding source n. The morphology of the mid-IR emission and the Orion ``hot core'' (as seen in NH3emission), along with the location of water and OH masers, is very suggestive of a bipolar cavity centered on source n and aligned with the rotation axis of the hypothetical circumstellar disk. IRc2, once thought to be the dominant energy source for the BN/KL region, clearly breaks into four subsources in our mosaic, as seen previously at 3.8-5.0 µm. The anticorrelation of mid-IR emission and NH3emission from the nearby hot core indicates that the IRc2 sources are roughly coincident (or behind) the dense hot core. The nature of IRc2 is not clear: neither self-luminous sources (embedded protostars) nor external heating by source ``I'' can be definitively ruled out. We also report the discovery of a new arclike feature southwest of the BN object and some curious morphology surrounding near-IR source ``t.''

Abstract Copyright:

Journal keyword(s): Infrared: ISM - ISM: individual (Orion BN/KL) - ISM: Individual: Alphanumeric: OMC-1 - ISM: Jets and Outflows - Stars: Early-Type - Stars: Formation

Nomenclature: Table 1: [RLK73] IRc NNW (Nos 2e, 3N, 3S, 6E, 16N, 16S, 16W, 19-23) added.

Simbad objects: 34

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