The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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AKARI Near-Infrared Spectroscopy of Blue Early-type Galaxies

  • Lee, Joon-Hyeop (Korea Astronomy and Space Science Institute) ;
  • Hwang, Ho-Seong (CEA Saclay/Service d'Astrophysique) ;
  • Lee, Myung-Gyoon (Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Choi, Jong-Chul (Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Matsuhara, Hideo (Institute for Space and Astronautical Science, Japan Aerospace and Exploration Agency)
  • Published : 2010.04.06
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Abstract

The first near-infrared (NIR) spectroscopic survey of SDSS-selected blue early-type galaxies (BEGs) has been conducted using the AKARI/IRC. The NIR spectra of 36 BEGs are successfully secured, which are well balanced in their SF/Seyfert/LINER type composition. For high signal-to-noise ratio, we stack the BEG spectra all and in bins of several properties: color, specific star formation rate and optically-determined spectral type. We estimate the NIR continuum slope and the 3.3 micron PAH emission equivalent width in the stacked BEG spectra, and compare them with those of SSP model galaxies and known ULIRGs. We first report the NIR spectral features of BEGs and discuss the nature of BEGs based on the comparison with other objects.

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