Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-20
Astronomy and Astrophysics
Astrophysics
2 pages, to appear in the Proceed. of IAU Symp.228 "From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution", eds
Scientific paper
10.1017/S1743921305006551
HE0141-3932 (zem=1.80) is a bright blue radio-quite quasar which reveals an emission line spectrum with an unusually weak Ly-alpha line. In addition, large redshift differences (Delta z=0.05) are observed between high ionization and low ionization emission lines. Absorption systems identified at z=1.78, 1.71, and 1.68 show mild oversolar metallicities (Z ~= 1-2Zsolar) and can be attributed to the associated gas clouds ejected from the circumnuclear region. The joint analysis of the emission and absorption lines leads to the conclusion that this quasar is seen almost pole-on. Its apparent luminosity may be Doppler boosted by ~10 times. The absorbing gas shows high abundance of Fe, Mg, and Al ([Fe, Mg, Al/C] ~= 0.15+/-0.10) along with underabundance of N ([N/C]<=-0.5). This abundance pattern is at variance with current chemical evolution models of QSOs predicting [N/C]>0 and [Fe/C]<0 at Z ~ Zsolar. Full details of this work are given in Reimers et al. (2005).
Agafonova Irina I.
Fechner Cora
Janknecht Eckart
Levshakov Sergei A.
Lopez Sebastian
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