Fast simultaneous infrared and optical photometry of NGC4151

A. Lawrence, A. B. Giles, I. M. McHardy, B. A. Cooke

Research output: Contribution to journalArticlepeer-review


The Seyfert galaxy NGC4151 was observed continuously in bands V and K for several hours each night during the week 1979 May 14-21. In our 22 arcsec aperture its magnitude remained constant to better than 0.05 mag at V = 12.01 and K = 8.67 on all time-scales from minutes to one week. The implications of differing characteristic time-scales of variability in different wavebands for the structure of the nucleus are discussed.
Original languageEnglish
Pages (from-to)149-154
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 1 Apr 1981


  • Galactic Nuclei
  • Galactic Structure
  • Infrared Astronomy
  • Seyfert Galaxies
  • Visual Photometry
  • Calibrating
  • Variability
  • X Ray Astronomy


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