The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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High Resolution Near Infrared Spectrum of NGC 7023

  • Le, Huynh Anh N. (School of Space Research, Kyung Hee University) ;
  • Pak, Soojong (School of Space Research, Kyung Hee University) ;
  • Lee, Hye-In (School of Space Research, Kyung Hee University) ;
  • Lee, Jae-Joon (Korea Astronomy and Space Science Institute) ;
  • Nguyen-Luong, Quang (The Canadian Institute for Theoretical Astrophysics (CITA), University of Toronto) ;
  • Kaplan, Kyle (Department of Astronomy, the University of Texas at Austin) ;
  • Jaffe, Daniel T. (Department of Astronomy, the University of Texas at Austin)
  • Published : 2014.10.13
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Abstract

The reflection nebula NGC 7023 is a typical example of a photodissociation region (PDR), which consists of high density molecular gas that is exposed to an intense UV radiation field. The source of the UV photons in NGC 7023 is the young pre-main-sequence Be star HD 200755. We present our near-infrared high-resolution (R ~ 40,000) spectrum of NGC 7023, covering a region of $1{\times}15$ arcseconds, observed during the commissioning runs of IGRINS (Immersion GRating near-INfrared Spectrometer). The spectrum shows many strong narrow emission lines that arise from the molecular rovibrational transitions of H2. From the intensity ratios between these H2 lines, we investigate physical conditions within the PDR such as the temperature, density, and pressure. The high spectral resolution of IGRINS allows us to resolve the velocity field of the PDR. In addition, we compare the IGRINS spectrum to Cloudy PDR model.

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