Physical Relation of Source I to IRc2 in the Orion KL Region

Details Physical Relation of Source I to IRc2 in the Orion KL Region Physical Relation of Source I to IRc2 in the Orion KL Region

2011-04-22

arxiv.org/abs/1104.4394v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

20 pages, 11 figures. Minor corrections had been done in the ver.2. Accepted for publication in PASJ

Scientific paper

We present mid-infrared narrow-band images of the Orion BN/KL region, and N-band low-resolution spectra of IRc2 and the nearby radio source "I." The distributions of the silicate absorption strength and the color temperature have been revealed with a sub-arcsecond resolution. The detailed structure of the 7.8 micron/12.4 micron color temperature distribution was resolved in the vicinity of IRc2. A mid-infrared counterpart to source I has been detected as a large color temperature peak. The color temperature distribution shows an increasing gradient from IRc2 toward source I, and no dominant temperature peak is seen at IRc2. The spectral energy distribution of IRc2 could be fitted by a two-temperature component model, and the "warmer component" of the infrared emission from IRc2 could be reproduced by scattering of radiation from source I. IRc2 itself is not self-luminous, but is illuminated and heated by an embedded luminous young stellar object located at source I.

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