Issue |
A&A
Volume 422, Number 2, August I 2004
|
|
---|---|---|
Page(s) | 523 - 526 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20041030 | |
Published online | 09 July 2004 |
The ratio of the C IV
1548,1550 rest-wavelengths
from high-redshift QSO absorption
lines
*
1
Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France e-mail: petitjean@iap.fr
2
LERMA, Observatoire de Paris-Meudon, 61 avenue de l'Observatoire, 75014 Paris, France
3
Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003-9305, USA
Received:
6
October
2003
Accepted:
3
May
2004
We use very high quality VLT-UVES quasar spectra
obtained in the course of the ESO Large Programme “Cosmic evolution
of the Intergalactic Medium", to show that the ratio of the
C iv doublet rest-wavelengths published in the literature and
widely used is not consistent with high-redshift observations.
From the analysis of 106 C iv systems we obtain:
/
.
A similar analysis on 28 Si iv systems shows that the
observed ratio is consistent with the well known
Si iv
1393,1402 wavelengths.
Using Si iv lines to calibrate the C iv lines in 11 systems, we find
.2049 and
Å
which is consistent with the Griesmann & Kling (2000) laboratory
wavelengths. The precision on the doublet ratio is better because of
the large number of C iv systems available for the measurement.
This shows that it is possible to perform atomic physics measurements
using high redshift astrophysical data.
Key words: cosmology: observations / galaxies: intergalactic medium / galaxies: halos / galaxies: quasars: absorption lines
© ESO, 2004
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