A z=0.45 DLA With Only Weak MgII Absorption?

Details A z=0.45 DLA With Only Weak MgII Absorption? A z=0.45 DLA With Only Weak MgII Absorption?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20912905j&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #129.05; Bulletin of the American Astronomical Society,

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We have detected FeI, MnII, CaI, and CaII absorption from one of the clouds of a multiple cloud weak MgII absorber (W(2796)=0.14 Angstroms) at z=0.4523, along the line of sight toward the quasar HE0001-2340. No other extragalactic absorber has detected FeI, and the ratio of FeI to FeII is even larger in this cloud than in Milky Way molecular cloud lines of sight. Using a Cloudy photoionization model, we have attempted to derive the physical conditions of this system. Two of the clouds have properties of typical MgII clouds, but we have been unable to produce the observed FeI/FeII and MgI/MgII ratios for the FeI-rich cloud. This raises questions about the validity of the charge transfer rates for these elements in the low temperature regime. We explore various possibilities with altered rates. Although we have not been able to fit the system with current Cloudy charge transfer rates, our results indicate that the cloud is cold and has a high density, suggesting that it is a DLA. We cannot confirm this because the spectrum is black in the Lyman series region due to a strong system at higher redshift. We speculate about what unusual circumstances lead to detected FeI and relatively weak MgII in this unique object. This system was studied using resolution R=45,000 data UVES/VLT data from the ESO archive, and research was supported by the National Science Foundation under Grant AST-07138 and by the REU Supplement Program.

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