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1999A&A...352L...1D - Astronomy and Astrophysics, volume 352L1-4 (1999/12-1)
Spectroscopic study of high redshift quasars.
DIETRICH M., APPENZELLER I., WAGNER S.J., GAESSLER W., HAEFNER R., HESS H.-J., HUMMEL W., MUSCHIELOK B., NICKLAS H., RUPPRECHT G., SEIFERT W., STAHL O., SZEIFERT T. and TARANTIK K.
Abstract (from CDS):
We obtained optical spectra of four quasars with 3<z<4 and SDSSpJ033829.31+002156.3 with z=5.0 with FORS1 at the VLT UT1 Antu. To estimate the relative abundances of the line emitting gas we used the line ratios NV1240/CIV1549, NV1240/HeII1640, and OVI1034/HeII1640 as suggested by Hamann & Ferland (1992ApJ...391L..53H, 1999, Ann. Rev. Astron. astrophys., 37, in press). Based on chemical evolutionary models we estimate a metallicity of Z≃7Z☉ for the quasars with z≃3 within the framework of the rapid star formation scenario. Even Q0338+0021 indicates a comparable high relative abundance. Qur results provide support for supersolar metallicities at very high redshifts of z≃5.
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Journal keyword(s): cosmology: early Universe - galaxies: quasars: emission lines
Simbad objects: 5
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