X-ray narrow line region variability as a geometry probe
نویسندگان
چکیده
منابع مشابه
On X-ray variability in narrow line and broad line AGNs
We assembled a sample of broad line and narrow lines AGNs observed by ASCA, whose excess variances have been determined. The central black hole masses in this sample can be obtained from the reverberation mapping method and the width of Hβ emission line. Using the black hole masses and the bolometric luminosity, the Eddington ratio can also be obtained. We confirmed the strong anti-correlation ...
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We report results from an 18-day ROSAT HRI monitoring campaign on the ultrasoft Narrow-Line Seyfert 1 (NLS1) class quasar PHL 1092. This luminous, radio-quiet quasar showed strong X-ray variability in a short ROSAT PSPC observation, and ROSAT HRI monitoring of the similar object IRAS 13224–3809 revealed extreme variability on intermediate timescales. We wanted to determine whether remarkable X-...
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We report on AGN with extremely soft X-ray spectra observed with ROSAT. From their optical emission lines these objects are classiied as narrow-line Seyfert 1 galaxies (NLS1), almost all with extremely large Fe ii/H ratios and relatively narrow optical lines of hydrogen. Our results are based on a systematic ROSAT study of 46 NLS1. 32 of these are located in the elds of view of ROSAT pointings ...
متن کاملX-ray spectral complexity in narrow-line Seyfert 1 galaxies
We present a systematic analysis of the X-ray spectral properties of a sample of 22 “narrow-line” Seyfert 1 galaxies for which data are available from the ASCA public archive. Many of these sources, which were selected on the basis of their relatively narrow Hβ line width (FWHM ≤2000 km/s), show significant spectral complexity in the X-ray band. Their measured hard power-law continua have photo...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2009
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200911639