Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4

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Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4. / Dietrich, M.; Appenzeller, I.; Hamann, F.; Heidt, J.; Jaeger, K.; Vestergaard, Marianne; Wagner, S. J.

In: Astronomy & Astrophysics, Vol. 398, No. 3, 02.02.2003, p. 891-899.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Dietrich, M, Appenzeller, I, Hamann, F, Heidt, J, Jaeger, K, Vestergaard, M & Wagner, SJ 2003, 'Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4', Astronomy & Astrophysics, vol. 398, no. 3, pp. 891-899. https://doi.org/10.1051/0004-6361:20021697

APA

Dietrich, M., Appenzeller, I., Hamann, F., Heidt, J., Jaeger, K., Vestergaard, M., & Wagner, S. J. (2003). Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4. Astronomy & Astrophysics, 398(3), 891-899. https://doi.org/10.1051/0004-6361:20021697

Vancouver

Dietrich M, Appenzeller I, Hamann F, Heidt J, Jaeger K, Vestergaard M et al. Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4. Astronomy & Astrophysics. 2003 Feb 2;398(3):891-899. https://doi.org/10.1051/0004-6361:20021697

Author

Dietrich, M. ; Appenzeller, I. ; Hamann, F. ; Heidt, J. ; Jaeger, K. ; Vestergaard, Marianne ; Wagner, S. J. / Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4. In: Astronomy & Astrophysics. 2003 ; Vol. 398, No. 3. pp. 891-899.

Bibtex

@article{d360003b13f846848be652479ccd55c8,
title = "Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4",
abstract = "We present observations of 11 high redshift quasars ($3.9 \la z \la 5.0$) observed with low spectral resolution in the restframe ultraviolet using FORS 1 at the VLT UT 1. The emission-line fluxes of strong permitted and intercombination ultraviolet emission lines are measured to estimate the chemical composition of the line emitting gas. Comparisons to photoionization calculations indicate gas metallicities in the broad emission line region in the range of solar to several times solar. The average of the mean metallicity of each high-z quasar in this sample is $Z/Z_\odot = 4.3 \pm 0.3$. Assuming a chemical evolution time scale of $\tau_{evol} \simeq 0.5 - 0.8$ Gyrs, we derive a redshift of $z_f \simeq 6 {\rm to} 8$ for the onset of the first major star formation episode (H$_o = 65$ km s$^{-1}$ Mpc$^{-1}$, $\Omega_M = 0.3$, $\Omega_\Lambda = 0.7$), corresponding to an age of the universe of several $10^8$ yrs at this epoch. We note that this epoch is also supposed to be the era of re-ionization of the universe.",
keywords = "astro-ph",
author = "M. Dietrich and I. Appenzeller and F. Hamann and J. Heidt and K. Jaeger and Marianne Vestergaard and Wagner, {S. J.}",
year = "2003",
month = feb,
day = "2",
doi = "10.1051/0004-6361:20021697",
language = "English",
volume = "398",
pages = "891--899",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "E D P Sciences",
number = "3",

}

RIS

TY - JOUR

T1 - Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4

AU - Dietrich, M.

AU - Appenzeller, I.

AU - Hamann, F.

AU - Heidt, J.

AU - Jaeger, K.

AU - Vestergaard, Marianne

AU - Wagner, S. J.

PY - 2003/2/2

Y1 - 2003/2/2

N2 - We present observations of 11 high redshift quasars ($3.9 \la z \la 5.0$) observed with low spectral resolution in the restframe ultraviolet using FORS 1 at the VLT UT 1. The emission-line fluxes of strong permitted and intercombination ultraviolet emission lines are measured to estimate the chemical composition of the line emitting gas. Comparisons to photoionization calculations indicate gas metallicities in the broad emission line region in the range of solar to several times solar. The average of the mean metallicity of each high-z quasar in this sample is $Z/Z_\odot = 4.3 \pm 0.3$. Assuming a chemical evolution time scale of $\tau_{evol} \simeq 0.5 - 0.8$ Gyrs, we derive a redshift of $z_f \simeq 6 {\rm to} 8$ for the onset of the first major star formation episode (H$_o = 65$ km s$^{-1}$ Mpc$^{-1}$, $\Omega_M = 0.3$, $\Omega_\Lambda = 0.7$), corresponding to an age of the universe of several $10^8$ yrs at this epoch. We note that this epoch is also supposed to be the era of re-ionization of the universe.

AB - We present observations of 11 high redshift quasars ($3.9 \la z \la 5.0$) observed with low spectral resolution in the restframe ultraviolet using FORS 1 at the VLT UT 1. The emission-line fluxes of strong permitted and intercombination ultraviolet emission lines are measured to estimate the chemical composition of the line emitting gas. Comparisons to photoionization calculations indicate gas metallicities in the broad emission line region in the range of solar to several times solar. The average of the mean metallicity of each high-z quasar in this sample is $Z/Z_\odot = 4.3 \pm 0.3$. Assuming a chemical evolution time scale of $\tau_{evol} \simeq 0.5 - 0.8$ Gyrs, we derive a redshift of $z_f \simeq 6 {\rm to} 8$ for the onset of the first major star formation episode (H$_o = 65$ km s$^{-1}$ Mpc$^{-1}$, $\Omega_M = 0.3$, $\Omega_\Lambda = 0.7$), corresponding to an age of the universe of several $10^8$ yrs at this epoch. We note that this epoch is also supposed to be the era of re-ionization of the universe.

KW - astro-ph

U2 - 10.1051/0004-6361:20021697

DO - 10.1051/0004-6361:20021697

M3 - Journal article

VL - 398

SP - 891

EP - 899

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

IS - 3

ER -

ID: 123369640