FeII/MgII Emission Line Ratio in High Redshift Quasars
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FeII/MgII Emission Line Ratio in High Redshift Quasars. / Dietrich, M.; Hamann, F.; Appenzeller, I.; Vestergaard, Marianne.
I: Astrophysical Journal, Bind 596, Nr. 2, 817, 27.06.2003.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - FeII/MgII Emission Line Ratio in High Redshift Quasars
AU - Dietrich, M.
AU - Hamann, F.
AU - Appenzeller, I.
AU - Vestergaard, Marianne
PY - 2003/6/27
Y1 - 2003/6/27
N2 - 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.
AB - 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.
KW - astro-ph
U2 - 10.1086/378045
DO - 10.1086/378045
M3 - Journal article
VL - 596
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 817
ER -
ID: 123370693