L. Zaninetti
Dipartimento di Fisica, Università degli Studi di Torino, Via Pietro Giuria 1, 10125 Torino, Italy (zaninetti@ph.unito.it).
Received 2013 July 8.
Accepted 2013 September 13.
]]> RESUMEN
Se revisan dos funciones de luminosidad (LF) recientes para galaxias y se determinan los parámetros que caracterizan a la LF del infrarrojo cercano. La primera LF es la función de Schechter modificada, que tiene 4 parámetros. La segunda es una generalización de la distribución gama,con 4 parámetros. Se revisan las fórmulas que dan el número de galaxias como función del corrimiento al rojo, y se presta atención especial a la posición del máximo fotométrico, que se expresa como función de un parámetro crítico, o del flujo radiativo, o de la magnitud aparente. Se presenta una simulación del Catálogo 2MASS en el marco de la teselación nopoissoniana de Voronoi.
ABSTRACT
Two recent luminosity function (LF) for galaxies are reviewed and the parameters which characterize the near infrared are fixed. A first LF is a modified Schechter LF with four parameters. Thesecond LF is derived from the generalized gamma distribution and has four parameters. The formulas which give the number of galaxies as function of the redshift are reviewed and a special attention is given to the position of the photometric maximum which is expressed as function of a critical parameter or the flux of radiation or the apparent magnitude. A simulation of the 2MASS Redshift Survey is given in the framework of the non Poissonian Voronoi Tessellation.
Key Words: galaxies: clusters: general —galaxies: luminosity function, mass function — galaxies: statistics.
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