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29 March 2024
 
  » arxiv » 1003.0201

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Photometric Properties of Six Local Volume Dwarf Galaxies from Deep Near-Infrared Observations
B. de Swardt ; R. C. Kraan-Korteweg ; H. Jerjen ;
Date 28 Feb 2010
AbstractWe have obtained deep near-infrared $J$- (1.25 $mu$m), $H$- (1.65$ mu$m) and $K_s$-band (2.15 $mu$m) imaging for a sample of six dwarf galaxies ($M_Bga-17$ mag) in the Local Volume (LV, $Dla10$ Mpc). The sample consists mainly of early-type dwarf galaxies found in various environments in the LV. Two galaxies (LEDA 166099 and UGCA 200) in the sample are detected in the near-infrared for the first time. The deep near-infrared images allow for a detailed study of the photometric and structural properties of each galaxy. The surface brightness profiles of the galaxies are detected down to the ~$24 mag arcsec^{-2}$ isophote in the $J$- and $H$-bands, and $23 mag arcsec^{-2}$ in the $K_s$-band. The total magnitudes of the galaxies are derived in the three wavelength bands. For the brightest galaxies ($M_Bla-15.5$ mag) in the sample, we find that the Two Micron All Sky Survey (2MASS) underestimates the total magnitudes of these systems by up to $la0.5$ mag. The radial surface brightness profiles of the galaxies are fitted with an exponential (for those galaxies having a stellar disk) or S’ersic law to derive the structure of the underlying stellar component. In particular, the effective surface brightness ($mu_e$) and effective radius ($r_e$) are determined from the analytic fits to the surface brightness profile. The $J$-$K_s$ colours for the galaxies have been measured to explore the luminosity-metallicity relation for early-type dwarfs. In addition, the $B$-$K_s$ colours of the galaxies are used to assess their evolutionary state relative to other galaxy morphologies. The total stellar masses of the dwarf galaxies are derived from the $H$-band photometric measurements. These will later be compared to the dynamical mass estimates for the galaxies to determine their dark matter content.
Source arXiv, 1003.0201
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