New results on particle acceleration in the centaurus a jet and counterjet from a deep Chandra observation

M. J. Hardcastle, R. P. Kraft, G. R. Sivakoff, J. L. Goodger, J. H. Croston, A. Jordán, D. A. Evans, D. M. Worrall, M. Birkinshaw, S. Raychaudhury, N. J. Brassington, W. R. Forman, W. E. Harris, C. Jones, A. M. Juett, S. S. Murray, P. E.J. Nulsen, C. L. Sarazin, K. A. Woodley

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

We present new deep Chandra observations of the Centaurus A jet, with a combined on-source exposure time of 719 ks. These data allow detailed X-ray spectral measurements to be made along the jet out to its disappearance at 4.5 kpc from the nucleus. We distinguish several regimes of high-energy particle acceleration; while the inner part of the jet is dominated by knots and has properties consistent with local particle acceleration at shocks, the particle acceleration in the outer 3.4 kpc of the jet is likely to be dominated by an unknown distributed acceleration mechanism. In addition to several compact counterjet features, we detect probable extended emission from a counterjet out to 2.0 kpc from the nucleus and argue that this implies that the diffuse acceleration process operates in the counterjet as well. A preliminary search for X-ray variability finds no jet knots with dramatic flux density variations, unlike the situation seen in M87.

Original languageEnglish
Pages (from-to)L81-L84
JournalAstrophysical Journal
Volume670
Issue number2 PART 2
DOIs
StatePublished - 2007
Externally publishedYes

Keywords

  • Galaxies: active
  • Galaxies: individual (Centaurus A)
  • Galaxies: jets
  • X-rays: galaxies

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