Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8323265m&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
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% 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.
Becker Robert H.
Holt Stephen S.
Marshall Francis E.
Mushotzky Richard F.
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