Jet-induced star formation in centaurus A

Jeremy R. Mould, Alex Ridgewell, John S. Gallagher, Michael S. Bessell, Stefan Keller, Daniela Calzetti, John T. Clarke, John T. Trauger, Carl Grillmair, Gilda E. Ballester, Christopher J. Burrows, John Krist, David Crisp, Robin Evans, Richard Griffiths, J. Jeff Hester, John G. Hoessel, Jon A. Holtzman, Paul Scowen, Karl R. StapelfeldtRagvendra Sahai, Alan Watson, Vicki Meadows

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The inner part of the northeast middle radio lobe of the radio galaxy Centaurus A is the site of complex interactions. This area contains a large H I cloud as well as filaments of ionized gas and associated blue knots, several of which exist along the northeastern edge of the radio-emitting zones. We observed the filaments and blue knots with the Hubble Space Telescope using WFPC2, and the ionized gas from the ground. Our sensitive, high angular resolution WFPC2 images reveal the presence of young stars, many concentrated in what appear to be OB associations, superimposed on a background sheet of older stars that is typical of the Cen A halo. The ages of the OB associations are estimated to be less than 15 Myr from a comparison of color-magnitude diagrams with those for the Large Magellanic Cloud star cluster NGC 2004, and younger stellar groups may be nearer regions of Hα emission. We discuss our data in the context of models for star formation stimulated by interactions between the radio jet and gas cloud.

Original languageEnglish (US)
Pages (from-to)266-276
Number of pages11
JournalAstrophysical Journal
Volume536
Issue number1 PART 1
DOIs
StatePublished - Jun 10 2000

Keywords

  • Galaxies: individual (NGC 5128)
  • Galaxies: jets
  • Galaxies: stellar content
  • Radio continuum: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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