Towards a Precision Cosmology from Starburst Galaxies at z>2
Abstract
This work investigates the use of a well-known empirical correlation between the velocity dispersion, metallicity, and luminosity in H beta of nearby HII galaxies to measure the distances to HII-like starburst galaxies at high redshifts. This correlation is applied to a sample of 15 starburst galaxies with redshifts between z=2.17 and z=3.39 to constrain Omega_m, using data available from the literature. A best-fit value of Omega_m = 0.21 +0.30 -0.12 in a Lambda-dominated universe and of Omega_m = 0.11 +0.37 -0.19 in an open universe is obtained. A detailed analysis of systematic errors, their causes, and their effects on the values derived for the distance moduli and Omega_m is carried out. A discussion of how future work will improve constraints on Omega_m by reducing the errors is also presented.
Cite
@article{arxiv.astro-ph/0410612,
title = {Towards a Precision Cosmology from Starburst Galaxies at z>2},
author = {E. R. Siegel and R. Guzmán and Jorge P. Gallego and M. Orduña López and P. Rodrí guez Hidalgo},
journal= {arXiv preprint arXiv:astro-ph/0410612},
year = {2009}
}
Comments
7 pages, 3 figures, accepted for publication in MNRAS