Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...556..676c&link_type=abstract
The Astrophysical Journal, Volume 556, Issue 2, pp. 676-693.
Astronomy and Astrophysics
Astronomy
6
Galaxies: Active, Galaxies: Interactions, Galaxies: Photometry, Galaxies: Seyfert
Scientific paper
This paper is the fourth in a series studying the optical properties of a sample of mid-infrared warm Seyfert galaxies and of a control sample of mid-infrared cold galaxies. The present paper is devoted to the analysis of the color distributions characterizing the hosts. The warm Seyfert 1 and 2 galaxies show opposite color gradients and their color profiles are depicting age and dust effects within single-burst, solar-metallicity models. In particular, we find ample evidence for the occurrence of strong star formation in the Seyfert 2 disks: their color and emission line two-dimensional maps suggest dust extinction associated with ongoing star formation in spiral and tidal features; their color profiles show starbursts of 0.5-1 Gyr or younger, superposed on the older underlying galaxy population. Most of these properties are shared with the cold galaxies, while the warm Seyfert 1 galaxies show mostly older stellar populations and, in only a few cases, evidence for circumnuclear star formation.
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