Astronomy Reports

, Volume 51, Issue 1, pp 1–18 | Cite as

Properties of galactic disks at optical and near-IR wavelengths

  • A. S. Gusev


We have analyzed the radial scales, central surface brightnesses, and colors of 400 disks of various types of galaxies. For nine galaxies, the brightness decrease and the central disk brightness were obtained via a two-dimensional decomposition of the U BV RI J H K photometric images into bulge and disk components. We used published disk parameters for 392 of the galaxies. The central surface brightness μ 0,i 0 and linear (disk) scale length h vary smoothly along the Hubble sequence of galaxies within a rather narrow interval. The disks of relatively early-type galaxies display higher central K surface brightnesses, higher central surface densities, higher central mass-to-luminosity ratios M/L(B), smaller sizes (relative to the diameter of the galaxy D 25), redder integrated colors, and redder central colors. The color gradient normalized to the radius of the galaxy and the “blue” central surface brightness of the disk, μ 0,i/0(B), are both independent of the galaxy type. The radial disk scales in different photometric bands differ less in early-type than in late-type galaxies. A correlation between the central disk surface brightness and the total luminosity of the galaxy is observed. We also consider the influence of dust on the photometric parameters of the disks.

PACS numbers

98.52.Nr 98.62.Hr 98.62.Js 95.75.De 98.62.Lv 


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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • A. S. Gusev
    • 1
  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia

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