Query : 2001A&A...373..836L

2001A&A...373..836L - Astronomy and Astrophysics, volume 373, 836-842 (2001/7-3)

Argon, silicon and iron abundances in the damped Ly-α system I Zw 18.


Abstract (from CDS):

We show how the ratio of the abundances of Ar, Si and Fe as derived from FUSE absorption spectra of I Zw 18 are affected by large-scale stochastic velocity fields (mesoturbulence). 21-cm observations with high spatial resolution show the presence of velocity fields with large correlation lengths. FUSE observations were performed with a large entrance aperture which fully covered the galaxy. This means that the observed profiles are averaged over the full body of I Zw 18. Taking this into account, we show that the observations are consistent with the abundance ratios [α-chain/Fe] being similar to those derived from Galactic metal-poor stars. Using a mesoturbulent approach, we found that the observed profiles can be reproduced well with [Fe/H]=-2.4±0.1, and [Si, Ar/Fe]=0.7±0.1.

Abstract Copyright:

Journal keyword(s): line: formation - line: profiles - galaxies: individual: I Zw 18

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 QSO J0003-2603 QSO 00 03 22.9530051057 -26 03 18.306624161   18 17.53     ~ 273 0
2 QSO B0201+113 QSO 02 03 46.65705872 +11 34 45.4095674   19.5 19.5 19.41   ~ 192 1
3 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1025 1

    Equat.    Gal    SGal    Ecl

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