A nuclear starburst ring in the spiral galaxy NGC 7552

Details A nuclear starburst ring in the spiral galaxy NGC 7552 A nuclear starburst ring in the spiral galaxy NGC 7552

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..984f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 107, no. 3, p. 984-991

Astronomy and Astrophysics

Astronomy

41

Astronomical Maps, H Alpha Line, Light (Visible Radiation), Near Infrared Radiation, Radio Astronomy, Radio Waves, Spiral Galaxies, Star Formation, Starburst Galaxies, Stellar Orbits, Astronomical Photometry, Calibrating, Charge Coupled Devices, Extinction, High Resolution, Optical Filters, Radio Telescopes

Scientific paper

We present radio maps of NGC 7552 that reveal a 1 kpc starburst ring not visible in single color optical images, largely because of dust. The radio emission from the ring is dominated by supernova remnants. There is little or no radio emission from the nucleus itself. Combined with broadband optical, near-infrared and narrow band H alpha images, we discuss the star formation activity in the circumnuclear region. In particular, we suggest that a burst of star formation occurred in the ring about 5 x 107 yr ago. The current SN rate is about one every 2 to 3 years. As well as the nuclear starburst ring, we identify two larger scale rings which are also associated with continuing star formation. These rings have similar dimensions to the outer, inner, and nuclear ring classification of Buta, and we interpret them in terms of orbital resonances due to a large scale bar. NGC 7552 may also possess a nuclear bar and an outflowing superwind, but further observations are required for confirmation. We speculate that nuclear rings may act as a depository for inflowing material and play a role in funneling an outflowing superwind.

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