Variable galactic nuclei

Details Variable galactic nuclei Variable galactic nuclei

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978s%26t....55..372h&link_type=abstract

Sky and Telescope, vol. 55, May 1978, p. 372-374.

Physics

1

Electromagnetic Radiation, Galactic Nuclei, Periodic Variations, Seyfert Galaxies, Brightness, Quasars, Red Shift, Variable Stars

Scientific paper

The nuclei of Seyfert galaxies share a point of commonality with quasars in that both are variable sources of electromagnetic radiation. Photography and electric photometry with smaller telescopes (in the 50 cm aperture range) have provided significant data pertaining to the nature of variation in Seyfert nuclei. It is noted that the signal stimulating variability can not move through the source at speeds faster than light, so that a rapidly varying source must necessarily be small by galactic standards. The possibility that variation is produced by many small sources is thus investigated. Also discussed is the possibility that the variability arises from massive rotating objects. It is therefore important to confirm whether the observed variation in the amplitude of light is correlated with changes in luminosity.

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