Mid-Infrared Imaging of Orion BN/KL. II. Luminosity Sources, Extinction Distribution, and the Nature of IRc2

Details Mid-Infrared Imaging of Orion BN/KL. II. Luminosity Sources, Extinction Distribution, and the Nature of IRc2 Mid-Infrared Imaging of Orion BN/KL. II. Luminosity Sources, Extinction Distribution, and the Nature of IRc2

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...509..283g&link_type=abstract

The Astrophysical Journal, Volume 509, Issue 1, pp. 283-298.

Astronomy and Astrophysics

Astronomy

95

Infrared: Ism: Continuum, Ism: Individual: Name: Orion-Bn, Ism: Individual: Name: Orion Kleinmann-Low

Scientific paper

We have recalculated the luminosities of IRc2 and the BN Object in the Orion BN/KL complex and determined the distributions of color temperature and silicate absorption-line strength over the region with much greater precision than before, using a complete set of well-sampled and nearly diffraction-limited array camera images of BN/KL at nine wavelengths between 4.8 and 20 mum. We find that the total infrared luminosity of IRc2 itself is only L ~ 1000 L_&sun; (much lower than the generally accepted value). However, the temperature and extinction distributions show that the significant luminosity source(s) in BN/KL must still be located within several arcseconds of IRc2. Our results, considered with recent radio continuum and maser emission observations, suggest that a luminous early-type star located at radio source ``I'' is embedded close to IRc2, obscured by ~60 mag of visual extinction from dust grains both local to IRc2 and in intervening clouds along the line of sight. The combined heating contributions of the hot stars ionizing the compact H II regions ``I'' (near IRc2), ``B'' (the BN Object), and ``L'' (infrared source ``n''), compact IRc objects (including 10 new peaks resolved here), and distributed near-infrared sources can account for the observed ~10^5 L_&sun; total luminosity of the BN/KL complex.

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