Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.356..224s&link_type=abstract
Nature (ISSN 0028-0836), vol. 356, March 19, 1992, p. 224, 225. Research supported by NSF and NASA.
Astronomy and Astrophysics
Astronomy
16
Light Modulation, Modulated Continuous Radiation, Seyfert Galaxies, Stellar Orbits, X Ray Sources, Black Holes (Astronomy), Exosat Satellite, Rosat Mission, Waveforms
Scientific paper
An obvious candidate for the phenomenon underlying the periodicity in the X-ray emission from the Seyfert galaxy NGC6814 is the orbital motion of a star or low-mass compact object around the central black hole. It is shown here that the presence of an orbiting star could be easily verified by looking for the effects of Lense-Thirring precession of the orbital plane caused by the dragging of inertial frames around a rotating black hole. Precession-induced variations in the waveform and in the phase of the observed periodicity should have a period of between a month and a year. Such variations could account for the different waveforms present in the Ginga and Exosat data set from observations of NGC6814 and may be detectable in existing Ginga and future Rosat, OSSE/BRO, and Astro-D data.
Begelman Mitchell C.
Sikora Marek
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