Minkowski's Object: A starburst triggered by a radio jet, revisited

Steve Croft*, Wil Van Breugel, Wim De Vries, Mike Dopita, Chris Martin, Raffaella Morganti, Susan Neff, Tom Oosterloo, David Schiminovich, S. A. Stanford, Jacqueline Van Gorkom

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

103 Citations (Scopus)

Abstract

We present neutral hydrogen, ultraviolet, optical, and near-infrared imaging, and optical spectroscopy, of Minkowski's Object (MO), a star-forming peculiar galaxy near NGC 541. The observations strengthen evidence that star formation in MO was triggered by the radio jet from NGC 541. Key new results are the discovery of a 4.9 X 10(8) M-circle dot double H I cloud straddling the radio jet downstream from MO, where the jet changes direction and decollimates; strong detections of MO, also showing double structure, in UV and H alpha; and numerous H II regions and associated clusters in MO. In UV, MO resembles the radio-aligned, rest-frame UV morphologies in many high-redshift radio galaxies (HzRGs), also thought to be caused by jet-induced star formation. MO's stellar population is dominated by a 7.5 Myr old, 1.9 X 10(7) M-circle dot instantaneous burst, with a current star formation rate of 0.52 M-circle dot yr(-1) (concentrated upstream from where the H I column density is high). This is unlike the jet-induced star formation in Centaurus A, where the jet interacts with preexisting cold gas; in MO, the H I may have cooled out of a warmer, clumpy intergalactic or interstellar medium as a result of jet interaction, followed by the collapse of the cooling clouds and subsequent star formation (consistent with numerical simulations). Since the radio source that triggered star formation in MO is much less luminous, and therefore more common than powerful HzRGs, and because the environment around MO is not particularly special in terms of abundant dense, cold gas, jet-induced star formation in the early universe might be even more prevalent than previously thought.

Original languageEnglish
Pages (from-to)1040-1055
Number of pages16
JournalAstrophysical Journal
Volume647
Issue number2
Publication statusPublished - 20-Aug-2006

Keywords

  • galaxies : jets
  • galaxies : starburst
  • stars : formation
  • INDUCED STAR-FORMATION
  • SPACE-TELESCOPE OBSERVATIONS
  • GALAXY-EVOLUTION-EXPLORER
  • CENTAURUS-A
  • PARTICLE-ACCELERATION
  • DYNAMICAL MODELS
  • COOLING FLOWS
  • HIGH-REDSHIFT
  • 4C 41.17
  • EMISSION

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