The Nature of the UV/X-Ray Absorber in PG 2302+029

Abstract

We present Chandra X-ray observations of the radio-quiet QSO PG 2302+029. This quasar has a rare system of ultra-high velocity (-56,000 km/s) UV absorption lines that form in an outflow from the active nucleus (Jannuzi et al. 2003). The Chandra data indicate that soft X-ray absorption is also present. We perform a joint UV and X-ray analysis, using photoionization calculations, to detemine the nature of the absorbing gas. The UV and X-ray datasets were not obtained simultaneously. Nonetheless, our analysis suggests that the X-ray absorption occurs at high velocities in the same general region as the UV absorber. There are not enough constraints to rule out multi-zone models. In fact, the distinct broad and narrow UV line profiles clearly indicate that multiple zones are present. Our preferred estimates of the ionization and total column density in the X-ray absorber (log U=1.6, N_H=10^22.4 cm^-2) over predict the O VI 1032, 1038 absorption unless the X-ray absorber is also outflowing at ~56,000 km/s, but they over predict the Ne VIII 770, 780 absorption at all velocities. If we assume that the X-ray absorbing gas is outflowing at the same velocity of the UV-absorbing wind and that the wind is radiatively accelerated, then the outflow must be launched at a radius of < 10^15 cm from the central continuum source. The smallness of this radius casts doubts on the assumption of radiative acceleration.

arXiv commentAccepted for Publication in ApJ

References in corpus (18)

• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• A Structure for Quasars
• An X-ray spectral study of 24 type-1 AGN
• The Rest-Frame Extreme Ultraviolet Spectral Properties of QSOs
• The Soft X-Ray Properties of a Complete Sample of Optically Selected Quasars II. Final Results
• A Composite HST Spectrum of Quasars
• ASCA Observations of Seyfert 1 galaxies: III. The Evidence for Absorption & Emission due to Photoionized Gas
• On the Nature of Soft X-ray Weak Quasi-Stellar Objects
• Intrinsic Absorption Lines in Seyfert 1 Galaxies. I. Ultraviolet Spectra from the Hubble Space Telescope
• X-ray emission from radio-quiet quasars in the SDSS Early Data Release. The alpha_ox dependence upon UV luminosity
• X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
• A Chandra Survey of Broad Absorption Line Quasars
• Keck High Resolution Spectroscopy of PKS 0123+257: Intrinsic Absorption in a Radio Loud Quasar
• Broad P V Absorption in the BALQSO, PG 1254+047: Column Densities, Ionizations and Metal Abundances in BAL Winds
• The Hubble Space Telescope Quasar Absorption Line Key Project XIII. A Census of Absorption Line Systems at Low Redshift
• Metal Abundances and Ionization in QSO Intrinsic Absorbers
• The HST Quasar Absorption Line Key Project XII. The Unusual Absorption Line System in the Spectrum of PG 2302+029 ---Ejected or Intervening?
• The Relationship Between the High Energy Continuum and Emission Lines in QSOs: A Low-Redshift Sample

Cited by in corpus (7)

• Extreme-Velocity Quasar Outflows and the Role of X-ray Shielding
• Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
• The Extreme High-Velocity Outflow in Quasar PG0935+417
• Survey of Extremely High-velocity Outflows in Sloan Digital Sky Survey Quasars
• The association between gas and galaxies I: CFHT spectroscopy and pair analysis
• Emergences of C IV narrow absorption troughs in the quasar SDSS J095254.10+021932.8
• The broad OVI absorber at z = 3.02 toward CTQ 325