A. M. Hidalgo-Gámez
Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510, México D. F., México (anamaria@astroscu.unam.mx).
Received 2003 September 9
Accepted 2004 January 20.
]]> ABSTRACT
The investigation presented here was focused on clarifying the existence of dwarf spiral galaxies as a separate group from classical spirals. First, a list of spiral galaxies with small sizes was obtained. Information on colors, luminosities, morphologies and chemical content was searched for in the literature for these galaxies. Using this information, it can be concluded that dwarf spirals are not likely to be the tail of the distribution of classical galaxies. On the contrary, significant differences in some of the most important properties of spiral galaxies, such as the metallicity gradient and the bar frecuency, were found. In any case, further and more accurate observations are needed for a definitive answer.
Key Words: Galaxies: Spirals — Galaxies: Stellar content — Interstellar medium: H II Regions general.
RESUMEN
En el presente estudio se ha tratado de comprobar si las galaxias espirales enanas constituyen un grupo diferente a las clásicas o por el contrario no son más que la cola de distribución de éstas. Para ello, lo primero ha sido establecer una lista de todas aquellas galaxias que tienen estructura espiral y pequeño tamaño. Después se ha buscado información acerca del color, luminosidad, morfología y características espectrales de estas galaxias. A partir de esta información se puede concluir que hay indicios más que suficientes para decir que las galaxias espirales enanas difieren de las espirales clásicas en algunas propiedades importantes como son la existencia de un gradiente en metalicidad y la frecuencia de las barras. De todas formas, son necesarias más observaciones de calidad para poder dar una respuesta definitiva.
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