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arXiv:astro-ph/0003023 (astro-ph)
[Submitted on 2 Mar 2000]

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

Authors:M. Gliozzi (1), Th. Boller (1), W. Brinkmann (1), W.N. Brandt (2) ((1) MPE Garching, (2) Pennsylvania State University, USA)
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Abstract: We 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.
Comments: 4 pages, 4 figures; accepted for publication in A&A Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0003023
  (or arXiv:astro-ph/0003023v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0003023

Submission history

From: Mario Gliozzi [view email]
[v1] Thu, 2 Mar 2000 13:59:38 UTC (109 KB)
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