Current star formation as the origin of kiloparsec-scale radio sources in nearby E/S0 galaxies

Astronomy and Astrophysics – Astronomy

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Extragalactic Radio Sources, Galactic Structure, Infrared Sources (Astronomy), Star Formation, Very Large Array (Vla), Far Infrared Radiation, Seyfert Galaxies, Supernova Remnants

Scientific paper

VLA images at 6 cm of eight nearby galaxies show extended emission on kpc scales. Existing optical data reveal that six of the host galaxies are likely to be genuine ellipticals or lenticulars, and two are possibly ellipticals or lenticulars. One galaxy, a Seyfert 1 and the most powerful in the radio, has a jet-like structure adjacent to a compact core. In five other galaxies the kpc-scale radio sources are associated either with known star-forming regions, or with regions that can reasonably be expected to be star-formation sites. Six galaxies are known to be H I rich, possibly due to gas capture during a recent encounter with a gas-rich companion galaxy. One or more gas-rich companions are identified for each of seven galaxies.

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