AAS Meeting #193 - Austin, Texas, January 1999
Session 107. (Quasars and Blazars-) High Luminosity AGN and their Environments
Display, Saturday, January 9, 1999, 9:20am-4:00pm, Exhibit Hall 1

## [107.18] Intrinsic Narrow Quasar Absorption Line Properties at z~2

R. Ganguly, M. Eracleous, J.C. Charlton, C.W. Churchill (Penn State Univ.)

We have searched HIRES/Keck~I spectra of six quasars for associated systems (<~5000~km~s-1) selected by {C~{\sc iv}~\lambda\lambda1548,1550} narrow absorption lines (NALs). We find five such systems toward four of these quasars. Three systems show evidence for partial coverage implying an intrinsic origin. Adding them to three other intrinsic NALs from the literature increases the available sample of HIRES/Keck spectra of intrinsic NALs to six. We extend the technique of Barlow~&~Sargent~(1997,~AJ,~113,~136) to separately constrain the coverage fractions of the continuum and broad emission line (BEL) sources. In at least two of the six intrinsic systems, {PG~1222+228} (this work) and {Q~2343+125} (Hamann~et~al.~1997,~ApJ,~478,~87), the {\it~continuum} source is partially covered (Cc<50%). This implies small cloud sizes (c. The continuum of the other four systems may also be partially covered. Based on our small collection, intrinsic NALs are observed in both radio-quiet and radio-loud objects with no apparent preference for radio-loud objects, as suggested by Anderson~et~al.~(1987,~AJ,~94,~278). These factors could be diagnostic of similar conditions in some region near the central engines of these quasars observed along some, but not all, lines of sight. While it is possible that the latter could arise from a separate population of quasars without intrinsic NALs, it is equally feasible that the cloud distribution is such that certain lines of sight have zero coverage while others exhibit partial coverage.