Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-05-06
Astronomy and Astrophysics
Astrophysics
10 pages, 11 postscript figures (one table and one figure are available only at the CDS); to be published on A&AS
Scientific paper
10.1051/aas:1999481
We present near-infrared, H-band (1.65 um), surface photometry of 174 spiral galaxies in the area of the Pisces-Perseus supercluster. The images, acquired with the ARNICA camera mounted on various telescopes, are used to derive radial profiles of surface brightness, ellipticities, and position angles, together with global parameters such as H-band magnitudes and diameters. The mean relation between H-band isophotal diameter D_{21.5} and the B-band D_{25} implies a B-H color of the outer disk bluer than 3.5; moreover, D_{21.5}/D_{25} depends on (global) color and absolute luminosity. The correlations among the various photometric parameters suggest a ratio between isophotal radius D_{21.5}/2 and disk scale length of about 3.5 and a mean disk central brightness of 17.5 H-mag arcsec^{-2}. We confirm the trend of the concentration index C_{31} with absolute luminosity and, to a lesser degree, with morphological type. We also assess the influence of non-axisymmetric structures on the radial profiles and on the derived parameters.
Baffa Carlo
Casertano Sefano
Chincarini Guido
Gavazzi Giuseppe
Giovanardi Carlo
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