Chemical abundances of late–type spiral galaxies from the SDSS

 

A. M. Hidalgo–Gámez, A. Moranchel–Basurto, and A. F. González–Fajardo

 

Departamento de Física, ESFM–IPN, México, México. (ahidalgo@esfm.ipn.mx, amoranchel@esfm.ipn.mx).

 

Received 2012 February 8.
Accepted 2012 March 22.

 

RESUMEN

Se ha determinado la abundancia de oxígeno para una muestra de 15 galaxias espirales tardías, tanto enanas (dS) como Sm normales. Los espectros se han obtenido de la base de datos del SDSS. Excepto tres de estas galaxias, el resto no tiene determinaciones previas de su contenido químico. La línea prohibida del oxígeno a 4363 Å no se pudo detectar excepto para cuatro galaxias. La abundancia para las otras galaxias se determinó usando los métodos semi–empíricos. Los resultados indican que la mayoría de las galaxias dS tienen abundancias menores que la solar mientras que las Sm pueden tener abundancias mayores.

 

ABSTRACT

Oxygen abundances have been determined for a total of 15 late–type spiral galaxies. The intensities of the emission lines were determined from the spectra retrieved from the SDSS data–base. Only three galaxies have abundances previously reported in the literature. For four of them the forbidden oxygen line was detected in the spectra but the T_e determined for three of them is larger than 20,000 K. The chemical abundances for the other galaxies were determined with semi–empirical methods. The values indicate that, in general, the oxygen abundance of dS galaxies is smaller than for Sm ones.

Key Words: galaxies: abundances — galaxies: spiral — H II regions.

 

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ACKNOWLEDGMENTS

Part of the work presented here is based on the Bachelor thesis of A. Moranchel–Basurto and the Servicio Social of A. F. González–Fajardo. The authors thank J. Brenan for English grammar corrections. A. M. H–G. thanks J. R. O'Dell and J. M. Vilchez for interesting discussions on the SDSS data. This investigation is supported by SIP–IPN grant 20121135 and Conacyt–2011–CB165584.

 

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