2008ApJ...676..262C -
Astrophys. J., 676, 262-285 (2008/March-3)
Characterizing the low-redshift intergalactic medium toward PKS 1302-102.
COOKSEY K.L., PROCHASKA J.X., CHEN H.-W., MULCHAEY J.S. and WEINER B.J.
Abstract (from CDS):
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 PKS 1302-102 (zQSO=0.2784). We supplement the archive data with CLOUDY ionization models and a survey of galaxies in the quasar field. There are 15 strong Lyα absorbers with column densities logN_HI_>14. Of these, six are associated with at least C III λ977 absorption [logN(C++)>13]; this implies a redshift density dN_CIII/dz=36+13^–9 (68% confidence limits) for the five detections with rest equivalent width Wr>50 mÅ. Two systems show O VI λλ1031, 1037 absorption in addition to C III [logN(O+5)>14]. One is a partial Lyman limit system (logN_HI_=17) with associated C III, O VI, and Si III λ1206 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 σ with Wr>50 mÅ, dN_OVI/dz=7+9^–4. We also search for O VI doublets without Lyα absorption but identify none. From CLOUDY modeling, these metal-line systems have metallicities spanning the range -4≲[M/H]≲-0.3. The two O VI systems with associated C III absorption cannot 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 km/s and 600 h–175 kpc with L>0.1L*.
Abstract Copyright:
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Journal keyword(s):
Galaxies: General - Galaxies: Intergalactic Medium - Galaxies: Quasars: Absorption Lines - quasars: individual (PKS 1302-102) - Techniques: Spectroscopic
VizieR on-line data:
<Available at CDS (J/ApJ/676/262): table2.dat table8.dat>
Nomenclature:
Tables 3, 7, 10: [CPC2008] QSO J1305-1033 abs N.NNNNN N=28. Table 8: [CPC2008] NNNN (Nos 1-3542).
Status at CDS
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