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A Cutoff in the X-ray Fluctuation Power Density Spectrum of the Seyfert 1 Galaxy NGC 3516
Rick Edelson, Kirpal Nandra
During 1997 March-July, XTE observed the bright, strongly variable Seyfert 1 galaxy NGC 3516 once every ~12.8 hr for 4.5 months and nearly continuously (with interruptions due to S…
A Peculiar Emission Line Feature in the X-ray Spectrum of the Quasar PKS 0637-752
T. Yaqoob, I. M. George, T. J. Turner +3
We report the results from an ASCA observation of the high-luminosity, radio-loud quasar PKS 0637-752 (redshift 0.654), covering the 0.8-15 keV band in the quasar-frame. We find th…
X-ray Observations of the Seyfert galaxy LB 1727 (1H 0419-577)
T. J. Turner, I. M. George, K. Nandra +5
We discuss the properties of the Seyfert 1.5 galaxy LB 1727, also known as 1H 0419-577, from X-ray observations obtained by ASCA and ROSAT along with optical observations from earl…
X-ray Signatures of an Ionized Reprocessor in the Seyfert galaxy Ton S 180
T. J. Turner, I. M. George, K. Nandra
We discuss the hard X-ray properties of the Seyfert galaxy Ton S 180, based upon the analysis of ASCA data. We find the X-ray flux varied by a factor ~2 on a time scale of a few th…
New constraints on the continuum-emission mechanism of AGN: Intensive monitoring of NGC 7469 in the X-ray and ultraviolet
K. Nandra, J. Clavel, R. A. Edelson +5
We have undertaken near-continuous monitoring of the Seyfert 1 galaxy NGC 7469 in the X-ray with RXTE over a ~30d baseline. The source shows strong variability with a root-mean-squ…
ASCA Observations of the Ionized Gas in the Seyfert Galaxy NGC 3783
I. M. George, T. J. Turner, R. F. Mushotzky +2
We present the results from ASCA observations of NGC 3783 carried out during 1993 and 1996. Variability is observed both between the two epochs and within the individual observatio…