%0 Generic %1 sanders2016mosdef %A Sanders, Ryan L. %A Shapley, Alice E. %A Kriek, Mariska %A Reddy, Naveen A. %A Freeman, William R. %A Coil, Alison L. %A Siana, Brian %A Mobasher, Bahram %A Shivaei, Irene %A Price, Sedona H. %A de Groot, Laura %D 2016 %K direct high-z measurement metallicity %T The MOSDEF Survey: Detection of OIII$łambda$4363 and the direct-method oxygen abundance of a star-forming galaxy at z=3.08 %U http://arxiv.org/abs/1606.04107 %X We present measurements of the electron-temperature based oxygen abundance for a highly star-forming galaxy at z=3.08, COSMOS-1908. This is the highest redshift at which OIII$łambda$4363 has been detected, and the first time that this line has been measured at z>2. We estimate an oxygen abundance of 12+log(O/H)$=8.00^+0.13_-0.14$. This galaxy is a low-mass ($10^9.3$ M$_ødot$), highly star-forming ($\sim50$ M$_ødot$ yr$^-1$) system that hosts a young stellar population ($\sim160$ Myr). We investigate the physical conditions of the ionized gas in COSMOS-1908 and find that this galaxy has a high ionization parameter, little nebular reddening ($E(B-V)_gas<0.14$), and a high electron density ($n_e\sim500$ cm$^-3$). We compare the ratios of strong oxygen, neon, and hydrogen lines to the direct-method oxygen abundance for COSMOS-1908 and additional star-forming galaxies at z=0-1.8 with OIII$łambda$4363 measurements, and show that galaxies at z$\sim$1-3 follow the same strong-line correlations as galaxies in the local universe. This agreement suggests that the relationship between ionization parameter and O/H is similar for z$\sim$0 and high-redshift galaxies. These results imply that metallicity calibrations based on lines of oxygen, neon, and hydrogen do not strongly evolve with redshift and can reliably estimate abundances out to z$\sim$3, paving the way for robust measurements of the evolution of the mass-metallicity relation to high redshift.

@misc{sanders2016mosdef, abstract = {We present measurements of the electron-temperature based oxygen abundance for a highly star-forming galaxy at z=3.08, COSMOS-1908. This is the highest redshift at which [OIII]$\lambda$4363 has been detected, and the first time that this line has been measured at z>2. We estimate an oxygen abundance of 12+log(O/H)$=8.00^{+0.13}_{-0.14}$. This galaxy is a low-mass ($10^{9.3}$ M$_{\odot}$), highly star-forming ($\sim50$ M$_{\odot}$ yr$^{-1}$) system that hosts a young stellar population ($\sim160$ Myr). We investigate the physical conditions of the ionized gas in COSMOS-1908 and find that this galaxy has a high ionization parameter, little nebular reddening ($E(B-V)_{\rm gas}<0.14$), and a high electron density ($n_e\sim500$ cm$^{-3}$). We compare the ratios of strong oxygen, neon, and hydrogen lines to the direct-method oxygen abundance for COSMOS-1908 and additional star-forming galaxies at z=0-1.8 with [OIII]$\lambda$4363 measurements, and show that galaxies at z$\sim$1-3 follow the same strong-line correlations as galaxies in the local universe. This agreement suggests that the relationship between ionization parameter and O/H is similar for z$\sim$0 and high-redshift galaxies. These results imply that metallicity calibrations based on lines of oxygen, neon, and hydrogen do not strongly evolve with redshift and can reliably estimate abundances out to z$\sim$3, paving the way for robust measurements of the evolution of the mass-metallicity relation to high redshift.}, added-at = {2016-06-15T10:00:49.000+0200}, author = {Sanders, Ryan L. and Shapley, Alice E. and Kriek, Mariska and Reddy, Naveen A. and Freeman, William R. and Coil, Alison L. and Siana, Brian and Mobasher, Bahram and Shivaei, Irene and Price, Sedona H. and de Groot, Laura}, biburl = {https://www.bibsonomy.org/bibtex/2b4e6d3a159c60ed0b60b635d3011738c/miki}, description = {[1606.04107] The MOSDEF Survey: Detection of [OIII]$\lambda$4363 and the direct-method oxygen abundance of a star-forming galaxy at z=3.08}, interhash = {9c390d3997188ae389ceec1309aec770}, intrahash = {b4e6d3a159c60ed0b60b635d3011738c}, keywords = {direct high-z measurement metallicity}, note = {cite arxiv:1606.04107Comment: 7 pages, 3 figures, 1 table, submitted to ApJ Letters}, timestamp = {2016-06-15T10:00:49.000+0200}, title = {The MOSDEF Survey: Detection of [OIII]$\lambda$4363 and the direct-method oxygen abundance of a star-forming galaxy at z=3.08}, url = {http://arxiv.org/abs/1606.04107}, year = 2016 }