A change in the variability properties of the intraday variable quasar 0917+624

Details A change in the variability properties of the intraday variable quasar 0917+624 A change in the variability properties of the intraday variable quasar 0917+624

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...352l.107k&link_type=abstract

Astronomy and Astrophysics, v.352, p.L107-L110 (1999)

Astronomy and Astrophysics

Astrophysics

17

Galaxies: Active, Galaxies: Quasars: Individual: 0917+624, Radio Continuum: Galaxies

Scientific paper

We observed the quasar 0917+624 at three epochs at a wavelength of 6 cm in order to study its short-timescale variability. In December 1997 and February 1999, the source showed its usual characteristics: variations on a 10-15 % level have been found on timescales <= 1.5 days. In contrast, in September 1998 the source exhibited a monotonic increase of about 7 % during a five-day-observing campaign. Assuming an intrinsic origin of the variations, this corresponds to a change in brightness temperature of at least two orders of magnitude. We discuss shortly several mechanisms which may cause the observed change of the variability properties of 0917+624.

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