The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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IRAS 15099-5856: Remarkable Mid-Infrared Source with Prominent Crystalline Silicate Emission

  • Koo, Bon-Chul (Department of Physics and Astronomy, Seoul National University) ;
  • McKee, Christopher F. (Department of Physics and Astronomy, University of California) ;
  • Suh, Kyung-Won (Department of Astronomy and Space Science Chungbuk National University) ;
  • Moon, Dae-Sik (Department of Astronomy & Astrophysics, University of Toronto) ;
  • Burton, Michael, G. (School of Physics, University of New South Wales) ;
  • Hiramatsu, Masaaki (Academia Sinica, Institue of Astronomy and Astrophysics) ;
  • Bessel, Michael S. (Research School of Astronomy and Astrophysics, Mount Stromlo Observatory) ;
  • Onaka, Takashi (Department of Astronomy, University of Tokyo) ;
  • Kim, Hyun-Jeong (Department of Physics and Astronomy, Seoul National University) ;
  • Jeong, Woong-Seob (Korea Astronomy and Space Science Institute) ;
  • Gaensler, Bryan (School of Physics, University of Sydney) ;
  • Im, Myung-Shin (Department of Physics and Astronomy, Seoul National University) ;
  • Lee, Ho-Gyu (Department of Astronomy & Astrophysics, University of Toronto) ;
  • Lee, Jae-Joon (Astronomy & Astrophysics Department, Pennsylvania State University) ;
  • Tatematsu, Ken'ichi (National Astronomical Observatory of Japan) ;
  • Kohno, Kotaro (Institute of Astronomy, University of Tokyo) ;
  • Ezawa, Ryohei (National Astronomical Observatory of Japan) ;
  • Ezawa, Hajime (National Astronomical Observatory of Japan) ;
  • Yun, Min-S. (Department of Astronomy, University of Massachusetts) ;
  • Hughes, David H. (Instituto Nacional de Astofisica)
  • Published : 2010.04.06
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Abstract

We report the discovery of a bright mid-infrared (MIR) source with prominent crystalline silicate emission using the space telescope AKARI and Spitzer. This source, IRAS 15099-5856, has a spectacular morphology with a bright central compact source (CCS) surrounded by knots, spurs, and several extended (~4') arc-like filaments. The source is seen only in infrared at ${\geq}10{\mu}m$. The Spitzer MIR spectrum of the CCS shows prominent emission features from Mg-rich crystalline silicates and strong [Ne II] 12.88 ${\mu}m$ and several other faint ionic lines. We model the MIR spectrum as thermal emission from several independent dust components and compare their properties to those of the Herbig Be star HD 100546 which shows very similar MIR spectrum. Our molecular line observations reveal two molecular clouds around the source, but no associated dense molecular cores. We discuss two possible origins for IRAS 15099-5856; a deeply embedded massive young stellar object on the other side of the Galaxy and a disrupted, protoplanetary disk being photoevaporated by the UV radiation from the nearby O star Muzzio 10.

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