Home List of Titles [O II] emitters in the GOODS field at z similar to 1.85: a homogeneous measure of evolving star formation
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/190021
- [O II] emitters in the GOODS field at z similar to 1.85: a homogeneous measure of evolving star formation
- Bayliss, K. D.; McMahon, R. G.; Venemans, B. P.; Ryan-Weber, E. V.; Lewis, J. R.
- We present the results of a deep, near-infrared, narrow band imaging survey at a central wavelength of 1.062 microns (FWHM=0.01 microns) in the GOODS-South field using the ESO VLT instrument, HAWK-I. The data are used to carry out the highest redshift search for [OII]3727 emission line galaxies to date. The images reach an emission line flux limit (5 sigma) of 1.5 x 10^-17 erg cm^-2 s^-1, additionally making the survey the deepest of its kind at high redshift. In this paper we identify a sample of [OII]3727 emission line objects at redshift z~1.85 in a co-moving volume of ~4100 Mpc^3. Objects are selected using an observed equivalent width (EW_obs) threshold of EW_obs = 50 angstroms. The sample is used to derive the space density and constrain the luminosity function of [OII] emitters at z=1.85. We find that the space density of objects with observed [OII] luminosities in the range log(L_[OII]) > 41.74 erg s^-1 is log(rho)=-2.45+/-0.14 Mpc^-3, a factor of 2 greater than the observed space density of [OII] emitters reported at z~1.4. After accounting for completeness and assuming an internal extinction correction of A_Halpha=1 mag (equivalent to A_[OII]=1.87), we report a star formation rate density of rho* ~0.38+/-0.06 Msun yr^-1 Mpc^-3. We independently derive the dust extinction of the sample using 24 micron fluxes and find a mean extinction of A_[OII]=0.98+/-0.11 magnitudes (A_Halpha=0.52). This is significantly lower than the A_Halpha=1 (A[OII]=1.86) mag value widely used in the literature. Finally we incorporate this improved extinction correction into the star formation rate density measurement and report rho*~0.24+/-0.06 Msun yr^-1 Mpc^-3.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Monthly Notices of the Royal Astronomical Society, Vol. 413, no. 4 (Jun 2011), pp. 2883-2894
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Galaxies; High redshifts; Luminosity function; Mass function; Star formation
- Wiley-Blackwell Publishing
- Publisher URL
- Copyright © 2011 The Authors. Monthly Notices of the Royal Astronomical Society copyright © 2011 RAS.
- Peer reviewed