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The Remarkably Featureless High Resolution X-ray Spectrum of Mrk 478
Herman L. Marshall, Rick A. Edelson, Simon Vaughan +3
An observation of Mrk 478 using the Chandra Low Energy Transmission Grating Spectrometer is presented. The source exhibited 30-40% flux variations on timescales of order 10000 s to…
A simultaneous XMM-Newton and BeppoSAX observation of the archetypal Broad Line Seyfert 1 galaxy NGC 5548
K. A. Pounds, J. N. Reeves, K. L. Page +3
We report the spectral analysis of a long XMM-Newton observation of the well-studied, moderate luminosity Broad Line Seyfert 1 galaxy NGC 5548. The source was at an historically av…
X-ray vs. Optical Variations in the Seyfert 1 Nucleus NGC 3516: A Puzzling Disconnectedness
Dan Maoz, Alex Markowitz, Rick Edelson +1
We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from March 1997 to March 2002, contemporaneously with X-ray 2-10…
Complex X-ray spectral variability in Mkn 421 observed with XMM-Newton
S. Sembay, R. Edelson, A. Markowitz +2
The bright blazar Mkn 421 has been observed four times for uninterrupted durations of ~ 9 - 13 hr during the performance verification and calibration phases of the XMM-Newton missi…