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Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing
Rick Edelson, Anuradha Koratkar, Kirpal Nandra +10
During 1998 April 13-16, NGC 3516 was monitored almost continuously with HST for 10.3 hr in the UV and 2.8 d in the optical, and simultaneous RXTE and ASCA monitoring covered the s…
PDS 456: an Extreme Accretion Rate Quasar?
J. N. Reeves, P. T. O'Brien, S. Vaughan +5
We present quasi-simultaneous ASCA and RXTE observations of the most luminous known AGN in the local (z<0.3) Universe, the recently discovered quasar PDS 456. Multiwavelength obser…
The optical variability of the narrow line Seyfert 1 galaxy IRAS 13224-3809
A. J. Young, C. S. Crawford, A. C. Fabian +2
We report on a short optical monitoring programme of the narrow-line Seyfert 1 Galaxy IRAS 13224-3809. Previous X-ray observations of this object have shown persistent giant variab…
Optical and X-ray Variability in The Least Luminous AGN, NGC4395
P. Lira, A. Lawrence, P. O'Brien +3
We report the detection of optical and X-ray variability in the least luminous known Seyfert galaxy, NGC4395. The featureless continuum changed by a factor of 2 in 6 months, which…
The effect of an attenuated continuum on the coronal line spectrum of NGC1068 and the Circinus galaxy
L. S. Nazarova, P. T. O'Brien, M. J. Ward
We present photoionization models of the optical and IR coronal line spectrum in NGC1068 and the Circinus galaxy. The line fluxes have been calculated using (a) a non-thermal (nucl…