ROSAT HRI monitoring of X-ray variability in the NLS1 galaxy PKS 0558-504

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dc.creatorGliozzi, M.
dc.creatorBoller, Th.
dc.creatorBrinkmann, W.
dc.creatorBrandt, W. N.
dc.date2000-03-02
dc.date.accessioned2026-07-07T01:52:35Z
dc.date.available2026-07-07T01:52:35Z
dc.descriptionWe present the results of ROSAT High Resolution Imager (HRI) observations and the survey data of the radio-loud Narrow-Line Seyfert 1 galaxy (NLS1) PKS 0558--504. We find strong and persistent X-ray variability on both short and medium time-scales. The most extreme amplitude variations require a radiative efficiency exceeding the theoretical maximum for a Schwarzschild black hole, suggesting the presence of a rotating black hole or the influence of relativistic beaming effects. The spatial analysis rules out the possibility that the high luminosity and the strong variability are related to a nearby source.
dc.description4 pages, 4 figures; accepted for publication in A&A Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/0003023
dc.identifierhttp://arxiv.org/abs/astro-ph/0003023
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/665
dc.subjectAstrophysics
dc.titleROSAT HRI monitoring of X-ray variability in the NLS1 galaxy PKS 0558-504
dc.typetext

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