2000MNRAS.314..307K -
Mon. Not. R. Astron. Soc., 314, 307-314 (2000/May-2)
Wide-field CCD surface photometry of the giant elliptical galaxy NGC 4472 in the Virgo cluster.
KIM E., LEE M.G. and GEISLER D.
Abstract (from CDS):
We present deep wide-field (16.4x16.4arcmin2) Washington CT1 CCD surface photometry of the giant elliptical galaxy NGC 4472, the brightest member of the Virgo cluster. Our data cover a wider and deeper field than any previous CCD photometry. A single King model does not give a good fit to the surface brightness profiles of NGC 4472, but they can be fitted approximately using two King models: with the separate models representing the inner and outer regions. Surface brightness profiles for the outer region can also be fitted approximately by a de Vaucouleurs law. There is clearly a negative colour gradient within 3arcmin of NGC 4472, in the sense that the colour gets bluer with increasing radius. The slope of the colour gradient for this region is derived to be Δµ(C-T1)=-0.08mag.arcsec–2 for Δlog r=1, which corresponds to a metallicity gradient of Δ[Fe/H]=-0.2dex. However, the surface colour becomes gradually redder with increasing radius beyond 3arcmin. A comparison of the structural parameters of NGC 4472 in C and T1 images has shown that there is little difference in the shapes of ellipses observed using isochromes or isophotes. In addition, photometric and structural parameters of NGC 4472 have been determined.
Abstract Copyright:
2000, Royal Astronomical Society
Journal keyword(s):
galaxies: abundances - galaxies: clusters: individual: Virgo - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: individual: NGC 4472 - galaxies: photometry
Simbad objects:
3
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