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Issue A&A Volume 370, Number 3, May II 2001 Page(s) 881 - 899 Section Extragalactic astronomy DOI 10.1051/0004-6361:20010288

A&A 370, 881-899 (2001)
DOI: 10.1051/0004-6361:20010288

Near-infrared observations of galaxies in Pisces-Perseus

IV. Color maps of 41 cluster spirals

G. Moriondo¹, C. Baffa¹, S. Casertano², G. Chincarini³, G. Gavazzi⁴, C. Giovanardi¹, L. K. Hunt⁵, D. Pierini⁶, M. Sperandio³ and G. Trinchieri<sup>7

1</sup>  Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
²  Space Telescope Science Inst., 3700 San Martin Drive, Baltimore, MD 21218, USA
³  Osservatorio Astronomico di Brera, Via E. Bianchi 46, 22055 Merate (CO), Italy
⁴  Dipartimento di Fisica, Sez. Astrofisica, Università di Milano, Via Celoria 16, 20133 Milano, Italy
⁵  C.A.I.S.M.I-C.N.R., Largo E. Fermi 5, 50125 Firenze, Italy
⁶  Department of Physics and Astronomy, University of Toledo, 2801 W. Bancroft, Toledo, OH 43606, USA
⁷  Osservatorio Astronomico di Brera, Via Brera 28, 20121 Milano, Italy

(Received 25 October 2000 / Accepted 16 February 2001)

Abstract
We present near-infrared (NIR) color maps of a sample of 41 disk galaxies in the Pisces-Perseus supercluster. The sample objects, mainly members of the Pisces cluster, are a subset of larger sample imaged in the H band. For most objects we present J-H and J-K images and elliptically-averaged radial color profiles; for some objects this is done only for the H-K color. We compute global colors, hybrid NIR-optical colors, and estimate the colors of the structural components. The J-K (global) color correlates weakly with absolute luminosity and morphological type. We observe no trend with the presence of bars and AGNs, nor with position within the cluster. The NIR disk colors are slightly bluer than the global ones, with the possible exception of those in the earliest spiral types. Finally, NIR color gradients in the images and in the radial color profiles are examined. NIR disk color gradients are small and prevalently negative; the few positive values are perhaps associated with the reddest disks.

Key words: galaxies: fundamental parameters -- galaxies: spiral -- infrared: galaxies

Offprint request: C. Giovanardi, giova@arcetri.astro.it

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