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

Abstract

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.

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

References in corpus (5)

• Explosive Outflows Powered by the Decay of Non-Hierarchical Multiple Systems of Massive Stars: Orion BN/KL
• Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
• A Multi-Epoch Study of the Radio Continuum Emission of Orion Source I: Constraints on the Disk Evolution of a Massive YSO and the Dynamical History of Orion BN/KL
• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• The near-infrared reflected spectrum of source I in Orion-KL

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• ALMA Imaging of Millimeter/Submillimeter Continuum Emission in Orion KL
• VERA and ALMA Observations of the H2O Supermaser Burst in Orion KL
• First Science Observations with SOFIA/FORCAST: 6 TO 37 micron Imaging of Orion BN/KL
• Outflow Structure and Velocity Field of Orion Source I: ALMA Imaging of SiO Isotopologue Maser and Thermal Emission
• High Spectral Resolution SOFIA/EXES Observations of C2H2 towards Orion-IRc2
• The First Mid-Infrared Detection of HNC in the Interstellar Medium: Probing the Extreme Environment Towards the Orion Hot Core
• The mid-infrared molecular inventory towards Orion IRc2
• Mapping physical parameters in Orion KL at high spatial resolution
• Keck Adaptive Optics Observations of the Protostellar Disk around Radio Source I in the Orion Kleinmann-Low Nebula