We present a detailed analysis of the intergalactic metal-line absorption systems in the archival HST /STIS and FUSE ultraviolet spectra of the low-redshift quasar PKS1302–102 ( z _ { QSO } = 0.2784 ) .
We supplement the archive data with CLOUDY ionization models and a survey of galaxies in the quasar field .
There are 15 strong Ly \alpha absorbers with column densities \log \mathrm { N } _ { HI } > 14 .
Of these , six are associated with at least C iii \lambda 977 absorption ( \log \mathrm { N } ( \mathrm { C } ^ { + + } ) > 13 ) ; this implies a redshift density dN _ { CIII } / dz = 36 ^ { +13 } _ { -9 } ( 68 % confidence limits ) for the five detections with rest equivalent width W _ { r } > 50 \mbox { m \AA } .
Two systems show O vi \lambda \lambda 1031 , 1037 absorption in addition to C iii ( \log \mathrm { N } ( \mathrm { O } ^ { +5 } ) > 14 ) .
One is a partial Lyman limit system ( \log \mathrm { N } _ { HI } = 17 ) with associated C iii , O vi , and Si iii \lambda 1206 absorption .
There are three tentative O vi systems that do not have C iii detected .
For one O vi doublet with both lines detected at 3 \sigma with W _ { r } > 50 \mbox { m \AA } , dN _ { OVI } / dz = 7 ^ { +9 } _ { -4 } .
We also search for O vi doublets without Ly \alpha absorption but identify none .
From CLOUDY modeling , these metal-line systems have metallicities spanning the range -4 \lesssim [ M/H ] \lesssim - 0.3 .
The two O vi systems with associated C iii absorption can not be single-phase , collisionally-ionized media based on the relative abundances of the metals and kinematic arguments .
From the galaxy survey , we discover that the absorption systems are in a diverse set of galactic environments .
Each metal-line system has at least one galaxy within 500 \mathrm { km s } ^ { -1 } and 600 h _ { 75 } ^ { -1 } \mathrm { kpc } with L > 0.1 L _ { \ast } .