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- W2038021248 abstract "The nucleus of the Seyfert galaxy NGC 4151 was observed during May and June 1977 at X-ray energies from 20 to 200 keV using the high-energy X-ray spectrometer on OSO 8 at radio frequencies of 2695 and 8085. Data were also taken in the visual, and at infrared wavelengths of 1 to 2 microns, and from 2 to 6 keV using the OSO 8 proportional counter. Optical data showed variability by a factor of 2 within the observing period, which is comparable to the variability in the 2 to 6 keV X-ray flux. No variability, however, was measured at infrared or radio frequencies. The composite spectrum from radio to gamma-ray is plotted, and it is found that the optical and X-ray fluxes varied during the observing period, although it is not known if they varied concurrently." @default.
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- W2038021248 date "1981-07-01" @default.
- W2038021248 modified "2023-09-27" @default.
- W2038021248 title "Concurrent radio, infrared, optical and X-ray observations of the nucleus of the Seyfert galaxy NGC 4151" @default.
- W2038021248 doi "https://doi.org/10.1086/159054" @default.
- W2038021248 hasPublicationYear "1981" @default.
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