Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Near-IR TRGB Distance Modulus of Dwarf Irregular Galaxy IC 1613

  • Jung, M.Y. (Department of Astronomy, Yonsei University) ;
  • Chun, S.H. (Department of Astronomy, Yonsei University) ;
  • Chang, C.R. (Department of Astronomy, Yonsei University) ;
  • Han, M. (Department of Astronomy, Yonsei University) ;
  • Lim, D. (Department of Astronomy, Yonsei University) ;
  • Han, W. (Korea Astronomy and Space Science Institute) ;
  • Sohn, Y.J. (Department of Astronomy, Yonsei University)
  • Published : 2009.12.15
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Abstract

The $JHK_S$ magnitudes of the red giant branch tip (TRGB) and the distance moduli of the nearby dwarf irregular galaxy IC 1613 have been determined from the near-infrared luminosity functions (LFs) of the resolved stars in the galaxy. Applying a Savitzky-Golay filtering, we derived the second derivatives of the LFs, and estimated the apparent magnitudes of the TRGB as $m_J\;=\;19.1$, $m_H\;=\;18.4$, and $m_{Ks}\;=\;18.0$. The mean values of the theoretical absolute magnitudes of the TRGB were measured by using the Yonsei-Yale isochrones with a metallicity range of -2.1 < [Fe/H] < -0.5 and age of 12 Gyr. The derived values of near-infrared TRGB distance moduli for IC 1613 are (m - M) = $24.12{\pm}0.25$, $24.20{\pm}0.44$, and $24.00{\pm}0.52$ for J, H, and $K_S$ bands, respectively.

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  1. THE ARAUCARIA PROJECT. INFRARED TIP OF THE RED GIANT BRANCH DISTANCES TO FIVE DWARF GALAXIES IN THE LOCAL GROUP vol.141, pp.6, 2011, https://doi.org/10.1088/0004-6256/141/6/194
  2. The AGB population in IC 1613 usingJHKphotometry vol.573, 2015, https://doi.org/10.1051/0004-6361/201423982