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FeII/MgII Emission Line Ratio in High Redshift Quasars

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We present results of the analysis of near infrared spectroscopic observations of 6 high-redshift quasars (z > 4), emphasizing the measurement of the ultraviolet FeII/MgII emission line strength in order to estimate the beginning of intense star formation in the early universe. To investigate the evolution of the FeII/MgII ratio over a wider range in cosmic time, we measured this ratio for composite quasar spectra which cover a redshift range of 0 4 quasars must have started already at an epoch corresponding to z_f = 6 to 9, when the age of the universe was ~0.5 Gyr (H_o = 72 km/s/Mpc, Omega_M = 0.3, Omega_Lambda = 0.7). This epoch corresponds well to the re-ionization era of the universe.
OriginalsprogEngelsk
Artikelnummer817
TidsskriftAstrophysical Journal
Vol/bind596
Udgave nummer2
ISSN0004-637X
DOI
StatusUdgivet - 27 jun. 2003

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