Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348205g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #482.05; Bulletin of the American Astronomical Society, Vol. 41, p.451
Other
Scientific paper
Strong MgII absorbers are generally thought to be associated with luminous galaxies and their disks and halos. Weak MgII absorbers (Wr(2796)<0.3Ang) are more loosely associated with luminous galaxies, and may be produced in dwarf galaxy winds, tidal debris, spiral disk outskirts, high velocity clouds, and/or the cosmic web. Previous studies of multiple cloud weak MgII absorbers at z=1 find a range of metallicities ranging from 3 percent of the solar value up to substantially supersolar values. This suggests different mechanisms of origin.
Here we present a case study of a multiple cloud weak MgII absorber, at z=1.974 along the sightline toward the quasar Q0122-380. We constrain our Cloudy photoionization models with a high resolution VLT/UVES spectrum. The data for this absorber serves as a particularly good constraint on the physical conditions because there is coverage of a variety of chemical transitions with different ionization conditions, including Lyman-alpha, MgII, FeII, SiII, AlII, CII, AlIII, SiIII, SiIV, CIV, and NV. Also, the shape of the Lyman-alpha profile allows us to constrain on the metallicity. A two phase solution is needed to fit both the low ionization and high ionization transitions, and the lower density, high ionization phase includes clouds at velocities at which low ionization absorption is not detected. The entire system extends over more than 600km/s in velocity. The AlII absorption is overproduced by most photoionization models. This discrepancy may be reconciled either by using a supersolar metallicity or by reducing the abundance of aluminum relative to other elements. We present improved models that reproduce the data, and discuss implications for the origin of high redshift multiple cloud weak MgII absorbers.
Charlton Jane
Green Rebecca
Narayanan Anand
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