Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-06
Astrophys.J. 630 (2005) 784-803
Astronomy and Astrophysics
Astrophysics
19 pages. To be published in ApJ, 10 September 2005, v630 2 issue. Full resolution version at: http://www.public.asu.edu/~ta
Scientific paper
10.1086/432028
We introduce a dataset of 142 mostly late-type spiral, irregular, and peculiar (interacting or merging) nearby galaxies observed in UBVR at the Vatican Advanced Technology Telescope (VATT), and present an analysis of their radial color gradients. We confirm that nearby elliptical and early- to mid-type spiral galaxies show either no or only small color gradients, becoming slightly bluer with radius. In contrast, we find that late-type spiral, irregular, peculiar, and merging galaxies become on average redder with increasing distance from the center. The scatter in radial color gradient trends increases toward later Hubble type. As a preliminary analysis of a larger data-set obtained with the Hubble Space Telescope (HST), we also analyze the color gradients of six nearby galaxies observed with NICMOS in the near-IR (H) and with WFPC2 in the mid-UV (F300W) and red (F814W). We discuss the possible implication of these results on galaxy formation and compare our nearby galaxy color gradients to those at high redshift. We present examples of images and UBVR radial surface brightness and color profiles, and of the tables of measurements; the full atlas and tables are published in the electronic edition only.
Hibbard John Eugene
Jansen Rolf A.
Odewahn Stephen C.
Taylor Violet A.
Windhorst Rogier A.
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