Mathematics – Logic
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5504l&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #55.04; Bulletin of the American Astronomical Society, Vol. 33, p.868
Mathematics
Logic
Scientific paper
Although there is a consensus that hot horizontal-branch (HB) and post-HB stars are the dominant UV sources in giant ellipticals, it is still debated whether the UV sources are metal-poor or metal-rich. The problem is that these two scenarios predict significantly different cosmological models. For example, if the metal-poor model is correct, then giant ellipticals are the oldest population in the Universe and would imply a non-zero cosmological constant from time scale test. We found that these two models predict substantially different UV-to-V flux ratios as functions of redshift (look-back time). We estimate this effect is detectable using GALEX by observing several dozens of not-so-dense clusters in the redshift range of 0.1 < z < 0.3 with the exposure times comparable to the GALEX DIS mode.
Byun Yong-Ik.
Lee Young-Wook
Rey Soo-Chang
Sohn Young-Jong
Yi Sun
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