Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2806b&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #28.06; Bulletin of the American Astronomical Society, Vol. 27, p.852
Astronomy and Astrophysics
Astronomy
Scientific paper
Combining samples of CIV and MgII absorption systems obtained from ground-based and HST observations has shown that the evolution of these two classes of absorbers reflects not only an evolution of their average cross-section, but also of their ionization level, opacity to ionizing UV radiation and chemical composition. The dimensions, mass and ionization level of individual absorbing clouds are lower at z = 0.5 than at z = 2, whereas the heavy element abundances are higher, reaching [Z/H] =~ -0.5 at z = 0.5. The latter is higher by a factor 3 to 5 than the values derived for two damped Lyalpha systems at z = 0.7. This might be explained in terms of different types of absorbing galaxies, at least for those identified so far. Several CIV systems at z > 0.6 have associated OVI absorption. This high ionization phase could be a homogeneus region of large extent, r >= 50 kpc, and low density, n_H <= 3 times 10(-4) cm(-3) , in which the denser CIV and MgII clouds are embedded.
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