1999A&A...352L...1D

Query : 1999A&A...352L...1D

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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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO B0044-2721 QSO 00 47 10.8671612640 -27 04 41.711702520     20.3     ~ 10 0
2 QSO B0046-2815 QSO 00 49 24.3965787000 -27 59 02.111546868   19.65 18.32     ~ 11 0
3 QSO J0105-2908 QSO 01 06 02.8403675208 -29 08 58.187340600     19.4     ~ 9 0
4 QSO B0103-260 QSO 01 06 04.4059842336 -25 46 51.327250896   18.82 18.31   18.6 ~ 33 0
5 QSO J0338+0021 QSO 03 38 29.3153623704 +00 21 56.241639108   25.10 23.26     ~ 106 0

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