Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281..231f&link_type=abstract
The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb
Mathematics
Logic
3
Scientific paper
We present results from a survey for low-redshift CIV absorbers in the sight lines to nine QSOs. Using echelle spectra obtained with the Space Telescope Imaging Spectrograph (STIS) at 7 km/s resolution, we robustly identify six CIV systems. All systems show at least the CIV doublet and HI Ly-alpha; SiIII, CIII, OVI, and higher Lyman series lines are also detected in several of these absorbers in the STIS data and complementary Far Ultraviolet Spectroscopic Explorer (FUSE) spectra. We calculate the number of CIV systems per unit redshift (dN/dz) and the cosmological mass density of the CIV ions (OmegaCIV). We find dN/dz = 5.2 +/- 2.7 for absorbers with a rest-frame equivalent width greater than 38~mA. Comparison of our estimate of OmegaCIV at z < 0.1 to analogous measurements at z > 2 provides a preliminary indication that the metallicity of the IGM is increasing with time. These results may have implications for understanding the effectiveness of observed galactic-scale outflows at high-z at enriching the IGM.
Bowen David B.
Frye Brenda L.
Jenkins Edward B.
Sembach Kenneth Russell
Tripp Todd M.
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