Open AccessLong‐term spectral changes in the partial‐covering candidate narrow‐line Seyfert 1 galaxy 1H 0707–495
Author(s) -
Gallo L. C.,
Tanaka Y.,
Boller Th.,
Fabian A. C.,
Vaughan S.,
Brandt W. N.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.08248.x
Subject(s) - physics , astrophysics , galaxy , outflow , luminosity , spectral line , spectral shape analysis , line (geometry) , emission spectrum , drop (telecommunication) , astronomy , geometry , meteorology , telecommunications , mathematics , computer science
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.