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A Lower Limit to the Universal Density of Metals at z sim 3 | | Antoinette Songaila
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5 Sep 1997 | | Journal: | Astrophys. J. 490 (1997) L1-L4 | | Subject: | astro-ph | | Affiliation: | Institute for Astronomy, University of Hawaii | | Abstract: | Column density distribution functions of CIV with 12.05 < log (N) < 14.35 and SiIV with 11.70 < log (N) < 13.93 have been obtained using 81 CIV absorbers and 35 SiIV absorbers redward of the Ly alpha forest in the lines of sight to seven quasars with 2.518 < z(em) < 3.78. These distribution functions have been directly integrated to yield ion densities at z = 3 to 3.5 of Omega(CIV) = (2.0 pm 0.5) x 10(-8) and Omega(SiIV) = (7.0 pm 2.6) x 10(-9) with H0 = 65 km/s/Mpc and q0 = 0.02 (1 sigma errors). A larger sample of 11 quasar lines of sight was used to measure CII/CIV, SiIII/SiIV, and NV/CIV ratios, which suggest that CIV and SiIV are the dominant ionization stages and that corrections to Omega(Carbon) and Omega(Silicon) are no more than a factor of two. Normalizing the alpha-process elements to silicon and the Fe-coproduction elements to carbon gives a density of heavy elements in these forest clouds of Omega(metals) = (3.3 pm 0.8) x 10(-7) (H0 = 65, q0 = 0.02). The implications for the amount of star formation and for the ionization of the IGM prior to z = 3 are discussed. | | Source: | arXiv, astro-ph/9709046 | | Services: | Forum | Review | PDF | Favorites | |
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