371 citations · 778 across the 23 of their papers we have counts for
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Multi-epoch X-ray spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 478
S. G. H. Waddell, L. C. Gallo, A. G. Gonzalez +2
A multi-epoch X-ray spectral and variability analysis is conducted for the narrow-line Seyfert 1 (NLS1) active galactic nucleus (AGN) Mrk 478. All available X-ray data from XMM-New…
The nature of the soft-excess and spectral variability in the Seyfert 1 galaxy Zw 229.015
S. Tripathi, S. G. H. Waddell, L. C. Gallo +2
We have carried out a systematic analysis of the nearby (z=0.0279) active galaxy Zw 229.015 using multi-epoch, multi-instrument and deep pointed observations with XMM-Newton, Suzak…
Nuclear spallation in active galaxies
L. C. Gallo, J. S. Randhawa, S. G. H. Waddell +3
A number of works point to the presence of narrow emission features at unusual energies in the X-ray spectra of active galactic nuclei (AGN) or to potentially low iron abundances a…
Evidence for an emerging disc wind and collimated outflow during an X-ray flare in the narrow-line Seyfert 1 galaxy Mrk 335
L. C. Gallo, A. G. Gonzalez, S. G. H. Waddell +13
A triggered 140 ks XMM-Newton observation of the narrow-line Seyfert 1 (NLS1) Mrk 335 in December 2015 caught the active galaxy at its lowest X-ray flux since 2007. The NLS1 is rel…