Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314402s&link_type=abstract
American Astronomical Society Meeting 203, #144.02; Bulletin of the American Astronomical Society, Vol. 36, p.588
Mathematics
Logic
Scientific paper
We investigate the use of a well-known empirical correlation between the velocity dispersion (sigma), metallicity (O/H), and luminosity in Hβ of nearby HII galaxies to measure the distances to HII-like galaxies at high redshifts. This method was first suggested by Melnick, Terlevich, and Terlevich (2000), who showed that the resulting distance measurements may place an important constrain on the cosmological parameter Omegam. We apply their method to a sample of 28 HII-type galaxies with redshifts between z=2.15 and z=3.38, using data available from the literature. A detailed analysis of systematic errors, their causes, and their effects on the values derived for the distances and Omegam was carried out. A discussion on how future work may improve the constraints on Omegam by reducing both systematic and random errors is also provided.
Gallego Perez J.
Guzman Rafael
Orduna Manuel
Rodriguez Hildago P.
Siegel Ethan R.
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