Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pgqa.conf..162l&link_type=abstract
Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held M
Astronomy and Astrophysics
Astronomy
Scientific paper
We combine FUV spectra obtained with FUSE and STIS/e140m of He 0226-4116 (z=0.495), pg 1116+215 (z em=0.177), and pg 1259+593 (z em=0.478) to determine the distribution of column density and doppler width of the Lyα absorber population at z detected in the spectra of these 3 quasars. The high spectral resolution UV spectra allow us to derive simultaneously the redshift, column density, and doppler width of each absorber. Two different populations of H I absorbers appear to be present: narrow and broad H I absorptions that could be tracers of the warm photoionised igm (t k) and warm-hot ionised medium (whim, t ˜ 105-106 k). For a reliable assessment of the baryonic content of the Lyα forest at low z it is crucial to determine the relative numbers of photoionised absorbers vs. hot collisionally ionised absorbers. Preliminary results indicate that 30-40% of the total baryons are in the photoionised igm and at least 20% in the whim. We also discuss the observed evolution of the doppler parameter with redshift.
Lehner Nicholas
Savage Blair. D.
Sembach Kenneth Russell
Tripp Todd M.
Wakker Bart P.
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