Examining the Seyfert-starburst connection with arcsecond-resolution radio continuum observations

Seppo Laine*, Jari K. Kotilainen, Juha Reunanen, Stuart D. Ryder, Rainer Beck

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We compare the arcsecond-scale circumnuclear radio continuum properties of five Seyfert and five starburst galaxies, concentrating on the search for any structures that could imply a spatial or causal connection between the nuclear activity and a circumnuclear starburst ring. No evidence is found in the radio emission for a link between the triggering or feeding of nuclear activity and the properties of circumnuclear star formation. Conversely, there is no clear evidence of nuclear outflows or jets triggering activity in the circumnuclear rings of star formation. Interestingly, the difference in the angle between the apparent orientation of the most elongated radio emission and the orientation of the major axis of the galaxy is on average larger in Seyfert galaxies than in starburst galaxies, and Seyfert galaxies appear to have a larger physical size scale of the circumnuclear radio continuum emission. The concentration, asymmetry, and dumpiness parameters of radio continuum emission in Seyfert galaxies and starbursts are comparable, as are the radial profiles of radio continuum and near-infrared line emission. The circumnuclear star formation and supernova rates do not depend on the level of nuclear activity. The radio emission usually traces the near-infrared Brγ and H 2 1-0 S(1) line emission on large spatial scales, but locally their distributions are different, most likely because of the effects of varying local magnetic fields and dust absorption and scattering.

Original languageEnglish
Pages (from-to)701-715
Number of pages15
JournalAstronomical Journal
Issue number2
Publication statusPublished - 1 Feb 2006
Externally publishedYes


  • Galaxies: active
  • Galaxies: nuclei
  • Galaxies: Seyfert
  • Galaxies: starburst
  • Radio continuum: galaxies


Dive into the research topics of 'Examining the Seyfert-starburst connection with arcsecond-resolution radio continuum observations'. Together they form a unique fingerprint.

Cite this