Towards a precision cosmology from starburst galaxies at z > 2 |
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Authors: | E R Siegel R Guzmán Jorge P Gallego M Orduña López P Rodríguez Hidalgo |
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Institution: | Department of Physics, University of Florida, Gainesville, FL 32611-8440, USA;Department of Astronomy, University of Florida, Gainesville, FL 32611, USA |
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Abstract: | This work investigates the use of a well-known empirical correlation between the velocity dispersion, metallicity and luminosity in Hβ of nearby H ii galaxies to measure the distances to H ii -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 Ωm , using data available from the literature. A best-fitting value of Ωm= 0.21+0.30?0.12 in a Λ-dominated universe and of Ωm= 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 Ωm is carried out. A discussion of how future work will improve constraints on Ωm by reducing the errors is also presented. |
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Keywords: | cosmological parameters H ii regions galaxies: fundamental parameters galaxies: high-redshift galaxies: starburst distance scale |
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