An Expanded RXTE Survey of X-ray Variability in Seyfert 1 Galaxies (2004)
Markowitz, Alex, Edelson, Rick
The first seven years of RXTE monitoring of Seyfert 1 active galactic nuclei have been systematically analyzed to yield five homogeneous samples of 2-12 keV light curves, probing hard X-ray...
Contrasting the UV and X-ray O VI Column Density Inferred for the Outflow in NGC 5548 (2003)
Arav, Nahum, Kaastra, Jelle, Steenbrugge, Katrien, Brinkman, Bert, Edelson, Rick, Korista, Kirk T., ...
We compare X-ray and UV spectroscopic observations of NGC 5548. Both data sets show O VI absorption troughs associated with the AGN outflow from this galaxy. We find that the robust lower limit on...
Correlated long-term optical and x-ray variations in NGC 5548 (2003)
Uttley, Phillip, Edelson, Rick, McHardy, Ian, Peterson, Bradley M., Markowitz, Alex
We combine the long-term optical light curve of the Seyfert 1 galaxy NGC5548 with the X-ray light curve measured by the Rossi X-ray Timing Explorer over 6 years, to determine the relationship between...
Correlated long-term optical and X-ray variations in NGC 5548 (2003)
Uttley, Phil, Edelson, Rick, McHardy, Ian, Peterson, Bradley M., Markowitz, Alex
We combine the long-term optical light curve of the Seyfert 1 galaxy NGC5548 with the X-ray light curve measured by the Rossi X-ray Timing Explorer over 6 years, to determine the relationship between...
Correlated long-term optical and x-ray variations in NGC 5548 (2003)
Uttley, Philip, Edelson, Rick, McHardy, Ian M., Peterson, Bradley M., Markowitz, Alex
We combine the long-term optical light curve of the Seyfert 1 galaxy NGC 5548 with the X-ray light curve measured by the Rossi X-Ray Timing Explorer over 6 years, to determine the relationship...
X-ray vs. Optical Variations in the Seyfert 1 Nucleus NGC 3516: A Puzzling Disconnectedness (2002)
Maoz, Dan, Markowitz, Alex, Edelson, Rick, Nandra, Kirpal
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 keV measurements...
Edelson, Rick, Turner, T. J., Pounds, Ken, Vaughan, Simon, Markowitz, Alex, Marshall, Herman, ...
The bright, soft X-ray spectrum Seyfert 1 galaxies Ark 564 and Ton S180 were monitored for 35 days and 12 days with ASCA and RXTE (and EUVE for Ton S180). The short time scale (hours-days)...
High Temporal Resolution XMM Monitoring of PKS 2155-304 (2001)
Edelson, Rick, Griffiths, Gareth, Markowitz, Alex, Sembay, Steve, Turner, Martin J. L., Warwick, Robert
The bright, strongly variable BL Lac object PKS 2155-304 was observed by XMM for two essentially uninterrupted periods of ~11 and 16 hr on 30-31 May 2000. The strongest variations occurred in the...
X-ray Power Density Spectrum of the Narrow Line Seyfert 1 Galaxy Akn 564 (2001)
Pounds, Ken, Edelson, Rick, Markowitz, Alex, Vaughan, Simon
Beginning in 1999 January, the bright, strongly variable Narrow-Line Seyfert 1 (NLS1) galaxy Akn 564 has been observed by RXTE once every ~4.3 days. It was also monitored every ~3.2 hr throughout...
Evidence for Rapid Iron K_alpha Line Flux Variability in MCG--6-30-15 (2000)
This paper employs direct spectral fitting of individual orbital data in order to measure rapid X-ray iron K_alpha line and continuum spectral slope variations in Seyfert 1 galaxies with...
X-Ray Variability of NLS1s and BLS1s (2000)
Evenly-sampled hard X-ray monitoring was obtained with RXTE for one NLS1 (Akn 564) and four BLS1s. The variability amplitude of the NLS1 was no larger than the mean of the BLS1s, and the NLS1 showed...
Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing (1999)
Edelson, Rick, Koratkar, Anuradha, Nandra, Kirpal, Goad, Michael, Peterson, Bradley M., Collier, Stefan, ...
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 same period. The...
A Possible 100-day X-ray-to-Optical Lag in the Variations of the Seyfert 1 Nucleus NGC 3516 (1999)
Maoz, Dan, Edelson, Rick, Nandra, Kirpal
We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from 1997 March to 1998 September, contemporaneously with the X-ray 2-10 keV...
A Cutoff in the X-ray Fluctuation Power Density Spectrum of the Seyfert 1 Galaxy NGC 3516 (1998)
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 SAA passage but not...
X-ray Observations of the Broad-Line Radio Galaxy 3C 390.3 (1997)
Leighly, Karen M., O'Brien, Paul T., Edelson, Rick, George, Ian M., Malkan, Matthew A., Matsuoka, Masaru, ...
We present the data and preliminary analysis for a series of 90 ROSAT HRI and two ASCA observations of the broad-line radio galaxy 3C 390.3. These data were obtained during the period 1995 January 2...