PKS 1004+13: A high-inclination, highly absorbed radio-loud QSO - The first radio-loud broad absorption line QSO at low redshift?

Beverley J. Wills, William Nielsen Brandt, A. Laor

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The existence of broad absorption line (BAL) outflows in only radio-quiet QSOs was thought to be an important clue to mass ejection and the radio-loud-radio-quiet dichotomy. Recently, a few radio-loud BAL QSOs have been discovered at high redshift. We present evidence that PKS 1004+13 is a radio-loud BAL QSO. It would be the first known at low redshift (zem = 0.24) and one of the most radio-luminous. For PKS 1004+13, there appear to be broad absorption troughs of O VI, N V, Si IV, and C IV, indicating high-ionization outflows up to ∼10,000 km s-1. There are also two strong, broad (∼550 km s-1), high-ionization associated absorption systems that show partial covering of the continuum source. The strong UV absorption we have detected suggests that the extreme, soft X-ray weakness of PKS 1004+13 is primarily the result of absorption. The large radio-lobe dominance indicates BAL and associated gas at high inclinations to the central engine axis, perhaps in a line of sight that passes through an accretion disk wind.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume520
Issue number2 PART 2
StatePublished - Aug 1 1999

Fingerprint

quasars
inclination
radio
ionization
outflow
dichotomies
troughs
ejection
accretion disks
lobes
line of sight
engines
engine
trough
coverings
accretion
continuums
gases
gas
x rays

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "PKS 1004+13: A high-inclination, highly absorbed radio-loud QSO - The first radio-loud broad absorption line QSO at low redshift?",
abstract = "The existence of broad absorption line (BAL) outflows in only radio-quiet QSOs was thought to be an important clue to mass ejection and the radio-loud-radio-quiet dichotomy. Recently, a few radio-loud BAL QSOs have been discovered at high redshift. We present evidence that PKS 1004+13 is a radio-loud BAL QSO. It would be the first known at low redshift (zem = 0.24) and one of the most radio-luminous. For PKS 1004+13, there appear to be broad absorption troughs of O VI, N V, Si IV, and C IV, indicating high-ionization outflows up to ∼10,000 km s-1. There are also two strong, broad (∼550 km s-1), high-ionization associated absorption systems that show partial covering of the continuum source. The strong UV absorption we have detected suggests that the extreme, soft X-ray weakness of PKS 1004+13 is primarily the result of absorption. The large radio-lobe dominance indicates BAL and associated gas at high inclinations to the central engine axis, perhaps in a line of sight that passes through an accretion disk wind.",
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PKS 1004+13 : A high-inclination, highly absorbed radio-loud QSO - The first radio-loud broad absorption line QSO at low redshift? / Wills, Beverley J.; Brandt, William Nielsen; Laor, A.

In: Astrophysical Journal, Vol. 520, No. 2 PART 2, 01.08.1999.

Research output: Contribution to journalArticle

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