Intensive HST/RXTE monitoring of NGC 3516: Evidence against thermal reprocessing

Details Intensive HST/RXTE monitoring of NGC 3516: Evidence against thermal reprocessing Intensive HST/RXTE monitoring of NGC 3516: Evidence against thermal reprocessing

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..437e&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Astronomy and Astrophysics

Astronomy

Active And Peculiar Galaxies And Related Systems, X-Ray Sources, X-Ray Bursts

Scientific paper

We report the results of intensive monitoring of NGC 3516 with HST and RXTE, which showed strong (50% peak-peak) variability in the X-rays and much weaker but highly significant (3.5% peak-peak) variability in the optical. The optical variations were highly correlated throughout the observed, band, with no measurable lags to a limit of τ<=0.15 d between 3590 and 5510 Å, while they showed no measurable correlation with the X-rays. This presents severe problems for ``reprocessing'' models in which the X-rays heat a stratified accretion disk that reradiates in the optical. .

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