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.
Originalsprog | Engelsk |
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Artikelnummer | 817 |
Tidsskrift | Astrophysical Journal |
Vol/bind | 596 |
Udgave nummer | 2 |
ISSN | 0004-637X |
DOI | |
Status | Udgivet - 27 jun. 2003 |
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