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NGC 7714 - The prototype star-burst galactic nucleus
Weedman, D. W.; Feldman, F. R.; Balzano, V. A.; Ramsey, L. W.; Sramek, R. A.; Wuu, C.-C.
AA(Pennsylvania State University, University Park, PA), AB(Pennsylvania State University, University Park, PA), AC(Pennsylvania State University, University Park, PA), AD(Pennsylvania State University, University Park, PA), AE(National Radio Astronomy Observatory, Socorro, NM)
Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 105-112. NSF-supported research; (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Bursts, Extragalactic Radio Sources, Galactic Nuclei, Seyfert Galaxies, Stellar Evolution, X Ray Sources, Iue, Line Spectra, Spiral Galaxies, Supernovae, Ultraviolet Astronomy
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New X-ray, ultraviolet (IUE), optical, and radio (VLA) observations are presented for the bright nucleus galaxy NGC 7714. All data are explainable as resulting from intense star-formation activity in this nucleus - a star burst. The X-ray and radio luminosities are explained by supernova remnants arising from the massive stars, and approximately 10,000 supernova remnants are required in a volume of 280 pc radius. It is thought that NGC 7714 is typical of a significant class of emission-line galaxies. It is pointed out that individual supernovae should be observable in this, or similar nuclei, because they are expected to occur at rates approaching one per year.

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