Chandra discovery of a 300 kiloparsec X-ray jet in the gigahertz-peaked spectrum quasar PKS 1127-145

Aneta Siemiginowska, Jill Bechtold, Thomas L. Aldcroft, Martin Elvis, D. E. Harris, Adam Dobrzycki

Research output: Contribution to journalArticlepeer-review

89 Scopus citations


We have discovered an X-ray jet with Chandra imaging of the z = 1.187 radio-loud quasar PKS 1127-145. In this paper we present the Chandra X-ray data, follow-up Very Large Array observations, and optical imaging using the Hubble Space Telescope Wide Field Planetary Camera 2. The X-ray jet contains 273 ± 5 net counts in 27 ks and extends ∼30″ from the quasar core, corresponding to a minimum projected linear size of ∼330 h50 -1 kpc. The evaluation of the X-ray emission processes is complicated by the observed offsets between X-ray and radio brightness peaks. We discuss the problems posed by these observations to jet models. In addition, PKS 1127-145 is a gigahertz-peaked spectrum (GPS) radio source, a member of the class of radio sources suspected to be young or "frustrated" versions of FR I radio galaxies. However, the discovery of an X-ray and radio jet extending well outside the host galaxy of PKS 1127-145 suggests that activity in this and other GPS sources may be long-lived and complex.

Original languageEnglish (US)
Pages (from-to)543-556
Number of pages14
JournalAstrophysical Journal
Issue number2 I
StatePublished - May 10 2002


  • Galaxies: jets
  • Quasars: individual (PKS 1127-145)
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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