Other
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..669t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 669-674. DOE-supported research.
Other
20
Vela Satellites, X Ray Sources, Galactic Nuclei, Power Spectra, Spectrum Analysis, X Ray Spectra
Scientific paper
The X-ray luminosity of Cen A (NGC 5128) was monitored by the Vela 5B satellite for 10 yr, beginning in 1969 May. The resultant data, which have only recently been analyzed with improved techniques, greatly augment our knowledge of the time history of the X-ray strength of Cen A. The results are essentially complete for the first 7 yr, with 10 day resolution, and are much more complete than other available data. The 1973-1976 period of exceptional activity was especially well covered in the Vela observations. It is characterized by numerous rapid changes in source intensity, in agreement with other available data, indicating that the nucleus of Cen A is small, massive, and at times an intense source of X-ray emission. The power spectrum for the most active period is similar to that for shot noise produced by 50 day outbursts. A number of outbursts lasting ˜50 days are, in fact, quite evident in the new data. The origin of this surprising phenomenon is not understood, but may be related to the dynamics of an accretion region around the galactic center.
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