165 citations · 708 across the 13 of their papers we have counts for
9 papers · 1 filter
The absence of a thin disc in M81
A. J. Young, I. McHardy, D. Emmanoulopoulos +1
We present the results of simultaneous Suzaku and NuSTAR observations of the nearest Low-Luminosity Active Galactic Nucleus (LLAGN), M81*. The spectrum is well described by a cut-o…
X-ray/UV/optical variability of NGC 4593 with Swift: Reprocessing of X-rays by an extended reprocessor
I M McHardy, S D Connolly, K Horne E M Cackett +25
We report the results of intensive X-ray, UV and optical monitoring of the Seyfert 1 galaxy NGC 4593 with Swift. There is no intrinsic flux-related spectral change in the the varia…
Swift monitoring of NGC 4151: Evidence for a Second X-ray/UV Reprocessing
R. Edelson, J. Gelbord, E. Cackett +41
Swift monitoring of NGC 4151 with ~6 hr sampling over a total of 69 days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3-50 keV) and six in t…
Correlated X-ray/UV/optical variability and the nature of accretion disc in the bare Seyfert 1 galaxy Fairall~9
Main Pal, Gulab C. Dewangan, S. D. Connolly +1
We study multi-wavelength variability of a bare Seyfert 1 galaxy Fairall~9 using \swift{} monitoring observations consisting of usable pointings spanning nearly two years and…
Long-term X-Ray Spectral Variability in AGN from the Palomar sample observed by Swift
S. D. Connolly, I. M. McHardy, C. J. Skipper +1
We present X-ray spectral variability of 24 local active galactic nuclei (AGN) from the Palomar sample of nearby galaxies, as observed mainly by Swift. From hardness ratio measurem…
The largest Swift AGN monitoring campaign: UV/optical variability in NGC 5548
S. D. Connolly, I. M. McHardy, D. T. Cameron +7
We report on the largest Swift AGN monitoring program, concerning UV/optical variability in Seyferts. From 554 observations, over a 750d period, of the Seyfert galaxy NGC 5548, we…
Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability
I. M. McHardy, D. T. Cameron, T. Dwelly +7
Lags measured from correlated X-ray/UV/optical monitoring of AGN allow us to determine whether UV/optical variability is driven by reprocessing of X-rays or X-ray variability is dr…
Long Term Wind-Driven X-Ray Spectral Variability of NGC 1365 with Swift
S. D. Connolly, I. M. McHardy, T. Dwelly
We present long-term (months-years) X-ray spectral variability of the Seyfert 1.8 galaxy NGC 1365 as observed by Swift, which provides well sampled observations over a much longer…
Variability of the accretion disk of V926 Sco inferred from tomographic analysis
S. D. Connolly, C. S. Peris, S. D. Vrtilek
We present phase-resolved spectroscopic observations of the low-mass X-ray binary V926 Sco (4U 1735-44), covering the orbital period of 0.23d, obtained with the Walter Baade 6.5m M…