| Title | Towards a precision cosmology from starburst galaxies at z > 2 |
| Authors | Siegel, E. R.; Guzmán, R.; Gallego, Jorge P.; Orduña López, M.; RodrÃguez Hidalgo, P. |
| Bibcode | 2005MNRAS.356.1117S Search ADS ↗ |
| Abstract | This work investigates the use of a well-known empirical correlation between the velocity dispersion, metallicity and luminosity in Hβ 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 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. |
| Objects | 15 Objects Search NED ↙ |
