The infrared jet in Centaurus A: multiwavelength constraints on emission mechanisms and particle acceleration

MJ Hardcastle*, RP Kraft, DM Worrall

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

37 Citations (Scopus)

Abstract

We report on Spitzer and Gemini observations of the jet of Centaurus A in the infrared, which we combine with radio, ultraviolet and X-ray data. Spitzer detects jet emission from about 2 arcmin from the nucleus, the emission becoming particularly bright after the jet flare point at similar to 3.4 arcmin. Where X-ray and infrared emission are seen together the broad-band data strongly support a synchrotron origin for the X-rays. The jet flare point is marked by a broad, diffuse region of X-rays which may be associated with a shock: we discuss possible physical mechanisms for this. The infrared jet persists after the flare point region although X-ray emission is absent; it is plausible that here we are seeing the effects of particle acceleration followed by downstream advection with synchrotron losses. Gemini data probe the inner regions of the jet, putting limits on the mid-infrared flux of jet knots.

Translated title of the contributionThe infrared jet in Centaurus A: multiwavelength constraints on emission mechanisms and particle acceleration
Original languageEnglish
Pages (from-to)L15-L19
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume368
Issue number1
DOIs
Publication statusPublished - 1 May 2006

Keywords

  • galaxies : active
  • galaxies : individual
  • Centaurus A
  • galaxies : jets
  • X-RAY STRUCTURE
  • CHANDRA OBSERVATIONS
  • RADIO-LOBE
  • NUCLEI
  • DUST

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