| タイトル | The Hubble Space Telescope Quasar Absorption Line Key Project: The Unusual Absorption-Line System in the Spectrum of PG 2302+029--Ejected or Intervening? |
| 本文（外部サイト） | http://hdl.handle.net/2060/19970022911 |
| 著者（英） | Kirhakos, S.; Boksenberg, A.; Bahcall, J. N.; Hartig, G. F.; Bergeron, J.; Savage, B. D.; Turnshek, D. A.; Jannuzi, B. T.; Sargent, W. L. W.; Wolfe, A. M.; Schneider, D. P.; Weymann, R. J. |
| 著者所属（英） | AURA, Inc.|National Optical Astronomy Observatories |
| 発行日 | 1996-10-10 |
| 言語 | eng |
| 内容記述 | We report the discovery of a high-ionization broad absorption line system at a redshift of z(sub abs) = 0.695 in the spectrum of the z(sub em) = 1.052 radio-quiet quasar PG 2302+029. Broad absorption with FWHM from 3000 to 5000 km/s 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 approx. 250 km/s) at z(sub 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 approx. 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. |
| NASA分類 | Astronomy |
| レポートNO | 97N23330
NAS 1.26:204677
NASA-CR-204677 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/101288 |
|
