Ariel V sky survey - X-ray variability of NGC 5128

A. Lawrence, J. P. Pye, M. Elvis

Research output: Contribution to journalArticlepeer-review


Long-term monitoring of the X-ray source associated with the nucleus of NGC 5128 has produced the most complete light curve in any frequency band for this peculiar active galaxy. The X-ray data indicate activity on at least two time scales: (1) a slow outburst with a time scale of 4-7 yr, (2) superimposed flares with a time scale of 20-50 day. This pattern of behavior is related to other X-ray active galaxies: specifically NGC 4151 (Seyfert) and MKN 421 (BL Lac). Some similarities are noted.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 1 Dec 1977


  • Ariel Satellites
  • Black Holes (Astronomy)
  • Galactic Nuclei
  • Light Curve
  • Sky Surveys (Astronomy)
  • X Ray Sources
  • Active Galaxies
  • Centaurus Constellation
  • Frequencies
  • Galactic Radiation
  • Peculiar Galaxies
  • Radiant Flux Density
  • Radioactivity
  • Seyfert Galaxies
  • Spectral Bands
  • Time
  • Variability


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