Establishing the Gaseous Phases of Galaxies Following the Epoch of Star Formation

Details Establishing the Gaseous Phases of Galaxies Following the Epoch of Star Formation Establishing the Gaseous Phases of Galaxies Following the Epoch of Star Formation

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8672c&link_type=abstract

HST Proposal ID #8672

Computer Science

Hst Proposal Id #8672 Quasar Absorption Lines And Igm

Scientific paper

We propose an ambitious program designed to: {1} establish if high ionization, metal-rich halos/coronae were in place as early as z 1, which would imply that extended, early-epoch, galactic halos result from reprocessed galactic gas and that the kinematics are mechanically driven; {2} obtain the first comparison of the relative kinematics of low and high ionization species in z 1 galaxies, covering a wide range of N{HI} environments and MgII kinematic spreads up to 400 km/s; {3} discriminate between single-phase and multi-phase ionization, and therefore spatial, absorbing structures {eg. MgII clouds embedded in diffuse high ionization halos}; and {4} place constraints on the gas-phase metallicites in early-epoch galaxies. We propose to obtain STIS R=30, 000 {Delta v = 10 km/s} spectra of five bright quasars, for which the FOS/HST data are fully analyzed. Our observational goal is to resolve the absorption profiles of several low, intermediate, and high ionization species, including OVI, OI, NV, NIII, CIV, CIII, CII, SiIV, SiIII, and SiII, in 18 MgII absorption systems covering 0.5<=z<=1.3. We incorporate our high signal-to-noise HIRES/Keck {Delta v=6.6 km/s} profiles of MgII, MgI, and FeII of the low ionization absorbing gas, and our database of the absorbing galaxy luminosities, colors, and impact parameters.

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