Observations of active galaxies

Details Observations of active galaxies Observations of active galaxies

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..666m&link_type=abstract

Nature (ISSN 0028-0836), vol. 325, Feb. 19, 1987, p. 666, 667.

Astronomy and Astrophysics

Astronomy

2

Active Galaxies, Galactic Nuclei, Galactic Radiation, Spaceborne Astronomy, X Ray Astronomy, Active Galactic Nuclei, Black Holes (Astronomy), Exosat Satellite, Periodic Variations, Power Spectra

Scientific paper

New information obtained by the EXOSAT satellite on the nature of the X-ray variability in AGNs is discussed. From the EXOSAT data, it is seen that many more AGNs vary on short timescales; in some cases, the character of the time variability is quantitatively and qualitatively different than expected from the flare model of the variability. Data on the two active galaxies NGC5506 and NGC4051, which exemplify these findings, are discussed.

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