|
Título:
|
The current star-formation rate of the local universe
|
|
Autores:
|
Gallego Maestro, Jesús ;
Zamorano Calvo, Jaime ;
Aragón Salamanca, A. ;
Rego Fernández, Manuel
|
|
Tipo de documento:
|
texto impreso
|
|
Editorial:
|
American Astronomical Society, 1995-12-10
|
|
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:
|
The Universidad Complutense de Madrid (UCM) survey is a long-term project aimed at finding and analyzing star-forming galaxies detected by their H? emission in Schmidt objective-prism plates. The instrumental setup limits the volume of the universe surveyed to a redshift z ? 0.045. So far we have discovered several hundred emission-line galaxies (ELGs) undergoing star formation at a wide range of levels. Analyzing a complete sample of ELGs from the UCM survey, we have computed the H? luminosity function for the star-forming galaxies in the surveyed volume of the universe. A Schechter function provides a good fit to the H_? luminosity function with the following parameters: ? = -1.3 ± 0.2, L^*(H_?) = 10^42.15±0.08 ergs s^-1, and ?^* = 10^-3.2±0.2 Mpc^3 for H_0 = 50 km s^-1 Mpc^-1. Integrating over the full range of luminosities, we obtain an H_? luminosity density of 10^39.1±0.2 ergs s^-1 Mpc^-3. Using the H_? emission as a star formation rate (SFR) estimator, this translates into a SFR density for the local universe of 0.013_?0.005^+0.007 M_? yr^-1 Mpc^-3 in star-forming galaxies with EW(H_? + [N_II]) > 10 Å and z lesssim 0.045 for a Scalo initial mass function. This is the first observational determination of this quantity, which will provide a direct test of current galaxy formation and evolution models.
|
|
En línea:
|
https://eprints.ucm.es/34379/1/jesusgallego115libre.pdf
|
