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Title:
A New Mid-Infrared Map of the BN/KL Region Using the Keck Telescope
Authors:
Shuping, R. Y.; Morris, Mark; Bally, John
Affiliation:
AA(Division of Astronomy and Astrophysics, 8371 Mathematical Sciences Building, UCLA, Los Angeles, CA 90095-1562 , ), AB(Division of Astronomy and Astrophysics, 8371 Mathematical Sciences Building, UCLA, Los Angeles, CA 90095-1562 , ), AC(Center for Astrophysics and Space Astronomy, Campus Box 389, University of Colorado, Boulder, CO 80309; )
Publication:
The Astronomical Journal, Volume 128, Issue 1, pp. 363-374. (AJ Homepage)
Publication Date:
07/2004
Origin:
UCP
AJ Keywords:
Infrared: ISM, ISM: individual (Orion BN/KL), ISM: Individual: Alphanumeric: OMC-1, ISM: Jets and Outflows, Stars: Early-Type, Stars: Formation
DOI:
10.1086/421373
Bibliographic Code:
2004AJ....128..363S

Abstract

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''×25'' 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 Lsolar). 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 NH3 emission), 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 NH3 emission 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.''
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