La evolución de galaxias ha sido ampliamente estudiada a altosdesplazamientos al rojo, pero existen pocos estudios en este campo abajos desplazamientos al rojo. Sin embargo, estudios a bajosdesplazamientos al rojo proveerían importantes indicios en la evoluciónde galaxias, estableciendo el vínculo necesario entre el universo local ya alto desplazamiento al rojo.
En este trabajo, nos enfocamos en la metalicidad del gas de galaxiasespirales a bajos desplazamientos al rojo buscando indicios deevolución en metalicidad. Analizamos la metalicidad de galaxias conluminosidades similares a diferentes desplazamientos al rojo de 0.1 < z< 0.4. Utilizamos galaxias del SDSS-DR5 procesadas con el códigoSTARLIGHT, corregimos los flujos de extinción por polvo, estimamosmetalicidades usando el método R23, y analizamos las muestras degalaxias con respecto al cociente de lineas [NII]6583/[OII]3727.De unamuestra de 207 galaxias, encontramos un decremento de ~0.1 dex en12+log(O/H) correspondiente al intervalo en desplazamiento al rojo de0.3 < z < 0.4 con respecto al resto de galaxias a menores desplazamientos al rojo, demostrando por primera vez una evolución en metalicidad en galaxias a bajos desplazamientos al rojo.
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References
2009, A&A Letters, 493, 5
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