Mathematics – Logic
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12252c&link_type=abstract
HST Proposal ID #12252. Cycle 18
Mathematics
Logic
Scientific paper
Evidence abounds from quasar absorption line data that the extended gaseous halos of galaxies comprise multiple phases {densities, temperatures, ionization conditions}. Developing a comprehensive and deeper understanding of the origin and persistence of extended galaxy halos, and their role in galaxy evolution, requires that these multiple phases be observed and analyzed. However, such studies that incorporate the host galaxies are virtually non-existent. The new COS instrument opens a new window in which the forest of FUV lines arising in neutral, low, AND high ionization halo gas can be probed with high resolution and sensitivity for multiple chemical species. For intermediate redshift galaxies, these lines are free of Ly-alpha forest contamination. We propose to obtain G160M COS/FUV high resolution spectra of the two quasars Q0454-220 {J0456-2159} and Q1038+064 {4c 06.41} in order to measure the neutral hydrogen Ly-beta, gamma, and delta transitions and the OVI 1031,1038 doublet and CII 1036 and CIII 977 transitions {as well as a few others that fall on the spectral format} in three intervening z 0.45 intervening gaseous halos. We augment the proposed observations with a similar pending COS spectrum {scheduled May 2010, PID 11667, PI Churchill} of the quasar TON 153, which will provide the multiphase absorption kinematics for two additional gaseous halos at z 0.67. The proposed observations will bring our final sample size to five.For these five systems, we have quantified the host galaxy morphologies {WFCP-2/HST images}, measured the galaxy emission lines and rotation curves {ESI/Keck spectra}, and analyzed the MgII 2796,2803 and FeII multiplet absorption {HIRES/Keck spectra}. Our goal is to undertake a comprehensive analysis of the multiphase physical conditions in these five galaxy-absorber pairs. We aim to perform the first ever quantitative comparison of the relative relationships between neutral, low, and high ionization absorbing halo gas kinematics with the galaxy kinematics and morphologies. We will interprete the data using synthetic absorption line data of the same transitions for "quasar sightlines" through a Eulerian adaptive resolution hydrodynamic cosmological simulation following the methods of Kacprzak etal. {2010}.;
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