|
Título:
|
On the metallicity dependence of the 24 ?m luminosity as a star formation tracer
|
|
Autores:
|
Relaño, M. ;
Lisenfeld, U. ;
Pérez González, Pablo Guillermo ;
Vílchez, J. M. ;
Battaner, E., E.
|
|
Tipo de documento:
|
texto impreso
|
|
Editorial:
|
American Astronomical Society, 2007-10-01
|
|
Dimensiones:
|
application/pdf
|
|
Nota general:
|
info:eu-repo/semantics/openAccess
|
|
Idiomas:
|
|
|
Palabras clave:
|
Estado = Publicado
,
Materia = Ciencias: Física: Astrofísica
,
Materia = Ciencias: Física: Astronomía
,
Tipo = Artículo
|
|
Resumen:
|
We investigate the use of the rest-frame 24 ?m luminosity as an indicator of the star formation rate (SFR) in galaxies with different metallicities by comparing it to the (extinction-corrected) H? luminosity. We carry out this analysis in two steps: First, we compare the emission from H (II) regions in different galaxies with metallicities between 12 + and 8.9. We find that the 24 ?m and the extinction-corrected H? luminosities from individual H (II) log (O/H) = 8.1 regions follow the same correlation for all galaxies, independent of their metallicity. Second, the role of metallicity is explored further for the integrated luminosity in a sample of galaxies with metallicities in the range of 12 +. For this sample we compare the 24 ?m and H? luminosities integrated over the entire galaxies log (O/ H) = 7.2-9.1 and find a lack of the 24 ?m emission for a given H? luminosity for low-metallicity objects, likely reflecting a low dust content. These results suggest that the 24 ?m luminosity is a good metallicity-independent tracer for the SFR in individual H (II) regions. On the other hand, metallicity has to be taken into account when using the 24 ?m luminosity as a tracer for the SFR of entire galaxies.
|
|
En línea:
|
https://eprints.ucm.es/38693/1/perezgonzalez88libre.pdf
|
