AAS 207th Meeting, 8-12 January 2006
Session 120 Intergalactic Medium and Absorption Line Systems
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[120.03] On the Properties of Two Strong MgII Absorbers Towards Q0454-220

N. Milutinovic, J.C. Charlton (Penn State), C.W. Churchill (NMSU)

We present the physical properties of two strong MgII systems at z=0.4744 and z=0.4833 toward the quasar Q0454-220. A HIRES/Keck spectrum, with resolution R=45,000, covers prominent low ionization features: MgII, FeII, CaII, and MgI. A HST/STIS spectrum, with R=30,000, covers the CIV and SiIV doublets. Coverage of the Lyman series lines and Lyman break region for these systems is provided by a HST/FOS spectrum, with R=1,300. The z=0.4744 system is a sub-DLA system, and the z=0.4833 system also produces a full Lyman limit break. Beginning with Voigt profile fits to the highest resolution data, we modeled these systems using the Cloudy photoionization code. The incident radiation is assumed to be a Haardt and Madau extragalactic background spectrum due to quasars and star-forming galaxies. We derive ranges of ionization parameters, number densities, sizes, temperatures, and metallicities for the absorbing clouds.

This research was supported by NASA under grant NAG5-6399 NNG04GE73G and by NSF under grant AST-04-07138.

The author(s) of this abstract have provided an email address for comments about the abstract: milni@astro.psu.edu

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