The HST quasar absorption line key project. 12. The Unusual absorption line system in the spectrum of PG-2302+029: Ejected or intervening?
Aug, 1996
10 pages
Published in:
- Astrophys.J.Lett. 470 (1996) L11-L14
e-Print:
- astro-ph/9608080 [astro-ph]
DOI:
Report number:
- HST-96-12
View in:
Citations per year
Abstract: (arXiv)
We report the discovery of a high-ionization broad absorption line system at a redshift of z_abs=0.695 in the spectrum of the z_em=1.052 radio-quiet quasar PG 2302+039. Broad absorption with FWHM from 3,000 to 5,000 km/s is detected from C IV, N V, and O VI in HST Faint Object Spectrograph spectra of the quasar. A narrow line system (FWHM approximately 250 km/s) at z_abs=0.7016 is resolved from the broad blend and includes absorption by Ly-alpha 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 approximately 56,000 km/s 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 from the quasar. The properties of this system are unprecedented whether it is an intervening or an ejected system.Note:
- 9 pages, LaTeX file, two postscript figures. Accepted for publication in The Astrophysical Journal Letters. Changes include removing TeX macros from abstract Journal-ref: Astrophys.J. 470 (1996) L11-L14
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