Observations of diskoseismology

Details Observations of diskoseismology Observations of diskoseismology

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..235s&link_type=abstract

In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc

Astronomy and Astrophysics

Astrophysics

2

Accretion Disks, Quasars, Red Shift, Seismology, Adiabatic Conditions, Brightness Distribution, Resonant Frequencies

Scientific paper

The diskoseismology theory of Nowak and Wagoner (1991) predicts damped oscillation frequencies for QSO accretion discs to be of order 60 days for a central mass of 10 exp 8 M(solar). We find strong evidence for 140 day periodicity in the intensively monitored gravitational mirage Q0957+561 A,B (TwQSO). With a (1+z) correction for the known QSO redshift of 1.4, this corresponds to a proper frequency of 58 days, which is close to the predicted frequency. The oscillation appears to be quasi-periodic and of only several percent amplitude, and is seen independently in the two mirage images.

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