Towards a Precision Cosmology from Starburst Galaxies at z>2

Details Towards a Precision Cosmology from Starburst Galaxies at z>2 Towards a Precision Cosmology from Starburst Galaxies at z>2

2004-10-25

arxiv.org/abs/astro-ph/0410612v1

Mon.Not.Roy.Astron.Soc. 356 (2005) 1117-1122

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08539.x

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.

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