Rapid X-ray variability from the Seyfert 1 galaxy NGC 4051

Details Rapid X-ray variability from the Seyfert 1 galaxy NGC 4051 Rapid X-ray variability from the Seyfert 1 galaxy NGC 4051

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269l..31m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 269, June 15, 1983, p. L31-L35.

Astronomy and Astrophysics

Astronomy

35

Emission Spectra, Galactic Radiation, Seyfert Galaxies, Variability, X Ray Spectra, Black Holes (Astronomy), Heao 2, Light Curve

Scientific paper

Strong variable X-ray emission from the nearby low luminosity Seyfert 1 galaxy NGC 4051 was discovered during observations with the imaging proportional counter of the Einstein Observatory. During one 2304 second observation, the X-ray flux more than doubled in an approximately linear fashion, and a 70 percent increase for 150 seconds was seen during another 968 second observation. Evidence is presented which demonstrates that the X-ray spectrum of NGC 4051 is unusually soft compared to Seyfert 1 galaxies or QSOs. The emission mechanism is probably not synchrotron or synchrotron self-Compton, but the emission can be plausibly explained by various black hole accretion models. Previously announced in STAR as N83-23265

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