Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-10
Astronomy and Astrophysics
Astrophysics
26 pages, 10 figures, accepted for publication to the Astronomical Journal
Scientific paper
10.1086/324728
This work presents new surface photometry and two-dimensional modeling of the light distribution of the Polar Ring Galaxy NGC 4650A, based on near-infrared (NIR) observations and high resolution optical imaging acquired during the Hubble Heritage program. The NIR and optical integrated colors of the S0 and the polar ring, and their scale parameters, are compared with those for standard galaxy morphological types. The polar structure appears to be a disk of a very young age, while the colors and light distribution of the host galaxy do not resemble that of a typical early-type system. We compare these observational results with the predictions from different formation scenarios for polar ring galaxies. The peculiarities of the central S0 galaxy, the polar disk structure and stellar population ages suggest that the polar ring galaxy NGC 4650A may be the result of a dissipative merger event, rather than of an accretion process.
Arnaboldi Magda
de Lucia Gabriella
Freeman Ken C.
Gallagher Jay S.
Iodice Enrica
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