We study the metallicity properties of galaxies in the zCOSMOS sample in the range 0.2 < z < 0.8. At z < 0.46, where Hα and [N II] are detected, we find the same dependence of metallicity on stellar mass and star formation rate, the fundamental metallicity relation (FMR), found by Mannucci et al. in Sloan Digital Sky Survey galaxies on a similar redshift range. We extend this relation to higher redshift, 0.49 < z < 0.8, where the R<SUB>23</SUB> metallicity index can be measured in our data, finding no evidence for evolution, and a metallicity scatter around the relation of about 0.16 dex. This result confirms, with a much higher level of significance with respect to previous works, the absence of evolution of the FMR during the last-half of cosmic history.
The metallicity properties of zCOSMOS galaxies at 0.2 < z < 0.8 / G. Cresci;F. Mannucci;V. Sommariva;R. Maiolino;A. Marconi;M. Brusa. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - STAMPA. - 421:(2012), pp. 262-269. [10.1111/j.1365-2966.2011.20299.x]
The metallicity properties of zCOSMOS galaxies at 0.2 < z < 0.8
BRUSA, MARCELLA
2012
Abstract
We study the metallicity properties of galaxies in the zCOSMOS sample in the range 0.2 < z < 0.8. At z < 0.46, where Hα and [N II] are detected, we find the same dependence of metallicity on stellar mass and star formation rate, the fundamental metallicity relation (FMR), found by Mannucci et al. in Sloan Digital Sky Survey galaxies on a similar redshift range. We extend this relation to higher redshift, 0.49 < z < 0.8, where the R23 metallicity index can be measured in our data, finding no evidence for evolution, and a metallicity scatter around the relation of about 0.16 dex. This result confirms, with a much higher level of significance with respect to previous works, the absence of evolution of the FMR during the last-half of cosmic history.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
