Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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NEAR-IR TRGB DISTANCE TO DWARF ELLIPTICAL GALAXY NGC 147

  • Kang, A. (Department of Astronomy, IEAA, Yonsei University) ;
  • Kim, J.W. (Department of Astronomy, IEAA, Yonsei University) ;
  • Shin, I.G. (Department of Astronomy, IEAA, Yonsei University) ;
  • Chun, S.H. (Department of Astronomy, IEAA, Yonsei University) ;
  • Kim, H.I. (Korea Astronomy and Space Science Institute) ;
  • Sohn, Y.J. (Department of Astronomy, IEAA, Yonsei University)
  • Published : 2007.09.10
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Abstract

We report the distance modulus of nearby dwarf elliptical galaxy NGC 147 estimated from the Tip of Red-giant Branch (TRGB) method applying to the color-magnitude diagrams and luminosity functions in the near-infrared JHK bands. Apparent magnitudes of TRGBs in each band are obtained by applying Savitzky-Golay filter to the luminosity functions, and the theoretical absolute magnitudes are estimated from Yonsei-Yale isochrones. The derived values of distance modulus to NGC 147 are $(m-M)=23.69{\pm}0.12,\;23.78{\pm}0.17,\;and\;23.85{\pm}0.22\;for\;J,\;H,\;and\;K$ bands, respectively. Distance modulus in bolometric magnitude is also derived as $(m-M)=23.87{\pm}0.11$. We compare the derived values of the TRGB distance modulus to NGC 147 in the near-infrared bands with the previous results in other bands.

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