@article{oai:soar-ir.repo.nii.ac.jp:00015876,
 author = {Misawa,  T and Charlton,  JC and Narayanan,  A},
 issue = {1},
 journal = {The Astrophysical Journal},
 month = {May},
 note = {Through photoionization modeling, constraints on the physical conditions of three z similar to 1.7 single-cloud weak Mg II systems [W-r(2796) <= 0.3 angstrom] are derived. Constraints are provided by high-resolution R = 45,000, high-S/N spectra of the three quasars HE0141-3932, HE0429-4091, and HE2243-6031, which we have obtained from the ESO archive of VLT UVES. Results are as follows.(1) The single-cloud weak Mg II absorption in the three z similar to 1.7 systems is produced by clouds with ionization parameters of -3.8 < log U less than or similar to -2.0 and sizes of 1-100 pc. (2) In addition to the low-ionization phase Mg II clouds, all systems need an additional one to three high-ionization phase C IV clouds within 100 km s(-1) of the Mg II component. The ionization parameters of the C IV clouds range from -1.9 < log U < -1.0, with sizes of tens of parsecs to kiloparsecs. (3) Two of the three single-cloud weak Mg II absorbers have near-solar or supersolar metallicities, if we assume a solar abundance pattern. Although such large metallicities have been found for z < 1 weak Mg II absorbers, these are the first high metallicities derived for such systems at higher redshifts. (4) Two of the three weak Mg II systems also need additional low-metallicity, broad Ly alpha absorption lines, offset in velocity from the metal-line absorption, in order to reproduce the full Ly alpha profile. (5) Metallicities in single-cloud weak Mg II systems are more than an order of magnitude larger than those in DLA systems at z similar to 1.7. In fact, there appears to be a gradual decrease in metallicity with increasing N-H (I), from these, the most metal-rich Ly alpha forest clouds, to Lyman limit systems, to sub-DLAs, and finally to the DLAs., Article, The Astrophysical Journal. 679:220-238 (2008)},
 pages = {220--238},
 title = {Supersolar metallicity in weak MgII absorption systems at z similar to 1.7},
 volume = {679},
 year = {2008}
}