VLT/UVES constraints on the carbon isotope ratio12C/ 13C at z = 1.15 toward the quasar HE 0515-4414

S. A. Levshakov, M. Centurión, P. Molaro, M. V. Kostina

Research output

15 Citations (Scopus)

Abstract

Aims. We analyzed the C I lines associated with the damped Lyα system observed at zabs = 1.15 in the spectrum of HE 0515-4414 to derive the 12C/13C ratio. Methods. The spectrum was obtained by means of the UV-Visual Echelle Spectrograph (UVES) at the ESO Very Large Telescope (VLT). Results. The obtained lower limit 12C/13C > 80 (2σ C.L.) shows for the first time that the abundance of 13C in the extragalactic intervening clouds is very low. This rules out a significant contribution from intermediate-mass stars to the chemical evolution of matter sampled by this line of sight. The estimated low amount of 13C is in agreement with low abundances of nitrogen observed in damped Lyα systems - the element produced in the same nuclear cycles and from about the same stars as 13C.

Original languageEnglish
JournalAstronomy and Astrophysics
Volume447
Issue number2
DOIs
Publication statusPublished - 1 Feb 2006

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carbon isotopes
quasars
spectrographs
carbon isotope
telescopes
stars
chemical evolution
European Southern Observatory
line of sight
nitrogen
cycles
method
chemical

Scopus subject areas

  • Space and Planetary Science

Cite this

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title = "VLT/UVES constraints on the carbon isotope ratio12C/ 13C at z = 1.15 toward the quasar HE 0515-4414",
abstract = "Aims. We analyzed the C I lines associated with the damped Lyα system observed at zabs = 1.15 in the spectrum of HE 0515-4414 to derive the 12C/13C ratio. Methods. The spectrum was obtained by means of the UV-Visual Echelle Spectrograph (UVES) at the ESO Very Large Telescope (VLT). Results. The obtained lower limit 12C/13C > 80 (2σ C.L.) shows for the first time that the abundance of 13C in the extragalactic intervening clouds is very low. This rules out a significant contribution from intermediate-mass stars to the chemical evolution of matter sampled by this line of sight. The estimated low amount of 13C is in agreement with low abundances of nitrogen observed in damped Lyα systems - the element produced in the same nuclear cycles and from about the same stars as 13C.",
keywords = "Cosmology: observations, Line: profiles, Quasars: absorption lines, Quasars: individual: HE 0515-4414, Stars: nucleosynthesis",
author = "Levshakov, {S. A.} and M. Centuri{\'o}n and P. Molaro and Kostina, {M. V.}",
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language = "English",
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journal = "ASTRONOMY & ASTROPHYSICS",
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VLT/UVES constraints on the carbon isotope ratio12C/ 13C at z = 1.15 toward the quasar HE 0515-4414. / Levshakov, S. A.; Centurión, M.; Molaro, P.; Kostina, M. V.

In: Astronomy and Astrophysics, Vol. 447, No. 2, 01.02.2006.

Research output

TY - JOUR

T1 - VLT/UVES constraints on the carbon isotope ratio12C/ 13C at z = 1.15 toward the quasar HE 0515-4414

AU - Levshakov, S. A.

AU - Centurión, M.

AU - Molaro, P.

AU - Kostina, M. V.

PY - 2006/2/1

Y1 - 2006/2/1

N2 - Aims. We analyzed the C I lines associated with the damped Lyα system observed at zabs = 1.15 in the spectrum of HE 0515-4414 to derive the 12C/13C ratio. Methods. The spectrum was obtained by means of the UV-Visual Echelle Spectrograph (UVES) at the ESO Very Large Telescope (VLT). Results. The obtained lower limit 12C/13C > 80 (2σ C.L.) shows for the first time that the abundance of 13C in the extragalactic intervening clouds is very low. This rules out a significant contribution from intermediate-mass stars to the chemical evolution of matter sampled by this line of sight. The estimated low amount of 13C is in agreement with low abundances of nitrogen observed in damped Lyα systems - the element produced in the same nuclear cycles and from about the same stars as 13C.

AB - Aims. We analyzed the C I lines associated with the damped Lyα system observed at zabs = 1.15 in the spectrum of HE 0515-4414 to derive the 12C/13C ratio. Methods. The spectrum was obtained by means of the UV-Visual Echelle Spectrograph (UVES) at the ESO Very Large Telescope (VLT). Results. The obtained lower limit 12C/13C > 80 (2σ C.L.) shows for the first time that the abundance of 13C in the extragalactic intervening clouds is very low. This rules out a significant contribution from intermediate-mass stars to the chemical evolution of matter sampled by this line of sight. The estimated low amount of 13C is in agreement with low abundances of nitrogen observed in damped Lyα systems - the element produced in the same nuclear cycles and from about the same stars as 13C.

KW - Cosmology: observations

KW - Line: profiles

KW - Quasars: absorption lines

KW - Quasars: individual: HE 0515-4414

KW - Stars: nucleosynthesis

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DO - 10.1051/0004-6361:200600001

M3 - Article

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VL - 447

JO - ASTRONOMY & ASTROPHYSICS

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