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Long-term AGN variability and the case of GSN 069

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arxiv 1106.3507 v1 pith:3VZ6ZD35 submitted 2011-06-17 astro-ph.CO

Richard Saxton , Andrew Read , Pilar Esquej , Giovanni Miniutti , Emilio Alvarez This is my paper · ORCID
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keywords galaxiesfluxlong-termnls1rosatseyfertvariabilityyears
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We report on a study of long-term flux variations in a sample of more than 1000 AGN observed with ROSAT and in the XMM-Newton slew survey. Over a period of 3-19 years, NLS1 galaxies as a class are found to be only slightly more variable than broad line Seyfert galaxies, despite the strong short term variability seen in some bright nearby NLS1s. Contrary to expectations, it is Seyfert II galaxies that exhibit the greatest flux volatility. One particular Sy II, which has brightened by a factor > 300 over 15 years, has been monitored in detail with Swift and XMM. The spectrum is extremely soft (kT \sim 60eV) consistent with pure thermal emission from an accretion disk and reminiscent of ROSAT observations of the NLS1,WPVS 007. We show that this is likely to be a "true" Sy II, without a BLR, and speculate that in its new high luminosity state we may be able to witness a BLR in formation.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 6 citations worldwide. Full citation record

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    The TDE AT2020vwl showed a third radio flare at the time a jet-wind collision was predicted from its first two flares, the first predicted-and-confirmed third flare.

  2. The properties of GSN 069 accretion disk from a joint X-ray and UV spectral analysis: stress-testing quasi-periodic eruption models

    astro-ph.HE 2025-01 conditional novelty 7.0 of 10

    A self-consistent X-ray plus UV analysis of GSN 069 finds a compact, viscously expanding TDE disk whose inferred properties in 2014 and 2018 challenge both disk-instability and orbiter-collision models of quasi-period...

  3. Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning

    astro-ph.GA 2025-01 conditional novelty 5.0 of 10

    Twelve faint quasar candidates show soft X-ray flux changes by factors over 10 across 20 years of XMM-Newton data, extending extreme-variability quasar searches to r ~ 22.

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