Heavy Element Abundances in Quasar Absorbers: New Observations with Chandra and HST Jill Bechtold (University of Arizona) With: Buell Jannuzi (NOAO), Jeff Valenti (STScI), Aneta Siemiginowska (CFA), Jennifer Scott (STScI), Don Schneider (Penn State), Martin Elvis (CFA), Bob Carswell (Cambridge), Rob Simcoe (Caltech), Wal Sargent (Caltech)

Quasar Absorption Spectroscopy Intergalactic Medium ISM of high z galaxies EUV Radiation background Observational tests of CDM models for galaxy and LSS formation

Dave et al. 1999 Column density of neutral hydrogen through a 200 km s-1 slice of the LCDM simulation volume Red corresponds to NH=1013-1014 cm-2, orange to NH=1014-1015 cm-2, yellow to NH=1015-1016 cm-2, and white to NH>1016 cm-2

Dave et al.1999

Dave et al.1999

dense phase associated with gas in galaxies. Shocked: Hot, Condensed: Cold, dense phase associated with gas in galaxies. Shocked: Hot, intermediate-density phase consisting of shock-heated gas in filaments and in galaxy, group, and cluster halos. Diffuse: Cool, low- density phase associated with gas whose temperature is determined by photoionization and adiabatic cooling. Impey et al. 1999

HST Continuous Viewing Zone Halo Gas -- HVC (complex C) Two Lyman Limit Systems IGM

Jannuzi et al. 2003

X-ray Absorption Soft X-ray absorption primarily due to => Helium, Carbon and Oxygen Dust independent . UV lines are saturated. H Lya measurements give N(HI) column. Compare X-ray absorption to Zinc (undepleted) => relative abundance of Fe group to alpha group Pop II has enhanced O/Fe M&MC 1983

Photoelectric Absorption in X-rays Redshift Nh 8e20 5e21 O Z=2 Redshift z=2 5e21 8e20 z=0.6 Z=0 Z=0

Chandra Observations Five damped Ly Alpha systems Different redshifts High redshift vs. low redshift QSO zqso zabs N(gal)* N(HI)* Chandra Ref B2 0738+393 0.63 0.091 0.48 1.5 Siemiginowska et al 0.221 0.8 PKS 1127 -145 1.19 0.312 0.33 5.1+/-0.9 Bechtold et al S4 0248+430 1.31 0.394 0.89 3.9+/-0.6 Turnshek et al AO 0235+164 0.94 0.524 0.39 4.5+/-0.4 Turnshek et al PKS 0458-02 2.29 2.04 0.76 8.0 Bechtold et al * 1e21 cm-2

Quasar Absorption PKS1127-145 DLA HST/WFPC2 Chandra Bechtold et al 2001, Siemiginowska et al 2002