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Bvri and h(alpha) surface photometry of the triple-ringed galaxy IC 4214

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Bvri and h(alpha) surface photometry of the triple-ringed galaxy IC 4214

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Título Bvri and h(alpha) surface photometry of the triple-ringed galaxy IC 4214
Autor Saraiva, Maria de Fátima Oliveira
Abstract BVRI and Ha CCD surface photometry is presented for the Sab system IC 4214, an example of a galaxy with three rings and no conventional bar. We obtained isophote maps, luminosity profiles, and basic photometric parameters. The photometry suggests the galaxy has three major structural components: the nuclear bulge, the disk, anda non-axisymmetric component that is a mixture of bar, inner ring and lens. The bar is a very weak feature that appears clearly only in the l band. Even so, the non-axisymmetric component contributes 23% to the total/luminosity. The Ha emission is concentrated mostly in the nuclear ring and in the two spiral arms that form the inner ring. Both the inner ring and nuclear ring are blue compared with their surroundings, and must contain regions of star formation mixed with dust. The existence of rings in non-barred and weakly barred galaxies is still not well explained by theories of ring formation. This galaxy seems to be a case like others that have appeared in the literature, where the bar was stronger in the past, and now is dissolving. © 1997 American Astronomical Society. [S0004-6256(97)03105-1]
Contido em The Astronomical Journal. New York. Vol. 113, no. 5 (May 1997), p. 1607-1617
Assunto Astrofisica extragalatica
Galáxia IC 4214
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/107741
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