NGC 7714 - The prototype star-burst galactic nucleus
Sramek, R. A.; Weedman, D. W.; Feldman, F. R.; Balzano, V. A.; Ramsey, L. W.; Wuu, C. -C.
United States
Abstract
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.