(Proposal ID) S14A-003

(PI) Maier, Christian

(Proposal Title)
 The mass-metallicity and fundamental metallicity relation at z>2

(Abstract)
The mass-metallicity relation (MZR) and its evolution is directly connected 
with the relationships between the stellar mass of galaxies and the dark matter
 mass of their haloes (Lilly et al. 2013). Obtaining fully consistent 
metallicities of galaxies over a wide range of redshifts is therefore 
important. Unfortunately, the widely used reference MZR at z > 2 from the 
Erb et al. (2006) study has been affected by the sample selection and unknown 
AGN contribution, and was based on limited spectroscopic information (1-2 
emission lines), yielding large uncertainties in metallicities. Here we propose
 FMOS spectroscopy to measure [OII], Hbeta, and [OIII] in J and H band for a 
sample of about 100 galaxies with reliable spectroscopic redshifts from the 
zCOSMOS-deep survey, including 20 z > 2 galaxies with measured Halpha and 
[NII] using previous observations with MOIRCS/Subaru and SINFONI/VLT. 
The aim is to measure reliable gas metallicities based on five emission lines 
to establish the MZR at z > 2, explore the existence of the fundamental 
metallicity relation (FMR) at z > 2 and its universality, and get new insights 
in the (chemical) evolution of galaxies by comparing the observed MZR and FMR 
with predictions of the gas-regulation model of Lilly et al. (2013).