Long-term spectral changes in the partial-covering candidate narrow-line Seyfert 1 galaxy 1H 0707-495

L. C. Gallo, Y. Tanaka, Th Boller, A. C. Fabian, S. Vaughan, W. N. Brandt

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We compare two XMM-Newton observations of the narrow-line Seyfert 1 galaxy 1H 0707-495, separated by two years, and discuss the results in terms of the partial-covering phenomenon. The second longer observation once again displays a sharp (<200 eV) spectral drop above 7 keV; however, in comparison with the first observation, the edge depth and energy have changed significantly. In addition to changes in the edge parameters, the high-energy spectrum appears steeper. The changes in the high-energy continuum can be adequately explained in terms of a partial-covering absorber outflowing from the central region. The low-energy spectrum also shows significant long-term spectral variability, including a substantial increase in the disc temperature, detection of a ∼0.9-keV emission feature and the presence of warm absorption that was also detected during the ASCA mission, but not seen during the first XMM-Newton observation. The large increase in disc temperature, and more modest rise in luminosity, can be understood if we consider the slim-disc model for 1H 0707-495. In addition, the higher disc luminosity could be the driving force behind the outflow scenario and the reappearance of a warm medium during the second XMM-Newton observation.

Original languageEnglish (US)
Pages (from-to)1064-1070
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Oct 1 2004

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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