The Hubble Space Telescope quasar absorption line key project: The unusual absorption-line system in the spectrum of PG 2302+029 - Ejected or intervening?

Buell Tomasson Jannuzi, G. F. Hartig, S. Kirhakos, W. L W Sargent, D. A. Turnshek, R. J. Weymann, J. N. Bahcall, J. Bergeron, A. Boksenberg, B. D. Savage, D. P. Schneider, A. M. Wolfe

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Abstract

We report the discovery of a high-ionization broad absorption line system at a redshift of zabs = 0.695 in the spectrum of the zem = 1.052 radio-quiet quasar PG 2302+029. Broad absorption with FWHM from 3000 to 5000 km s-1 is detected from C IV, N V, and O VI in Hubble Space Telescope (HST) Faint Object Spectrograph spectra of the quasar. A narrow-line system (FWHM ∼ 250 km s-1) at zabs = 0.7016 is resolved from the broad blend and includes absorption by Lyα and the C IV, N V, and O VI doublets. No absorption by low-ionization metal species (e.g., Si II and Mg II) is detected in the HST or ground-based spectra for either the broad or the narrow system. The centroids of the broad system lines are displaced by ∼56,000 km s-1 to the blue of the quasar's broad emission lines. The reddest extent of the broad-line absorption is more than 50,000 km s-1 from the quasar. The properties of this system are unprecedented, whether it is an intervening or an ejected system.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume470
Issue number1 PART II
Publication statusPublished - Oct 10 1996
Externally publishedYes

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Keywords

  • Cosmology: observations
  • Galaxies: clusters: general
  • Intergalactic medium
  • Quasars: absorption lines

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Jannuzi, B. T., Hartig, G. F., Kirhakos, S., Sargent, W. L. W., Turnshek, D. A., Weymann, R. J., ... Wolfe, A. M. (1996). The Hubble Space Telescope quasar absorption line key project: The unusual absorption-line system in the spectrum of PG 2302+029 - Ejected or intervening? Astrophysical Journal, 470(1 PART II).