NDLI: I Zw 1 observed with XMM-Newton — Low-energy spectral complexity, iron lines, and hard X-ray flares

Content Provider	EDP Sciences
Author	L. C. Gallo Th. Boller W. N. Brandt A. C. Fabian S. Vaughan
Abstract	We present a 20 ks XMM-Newton observation of the prototypical Narrow-Line Seyfert 1 galaxy I Zw 1. The best-fit model to the data is a double blackbody plus a dominant power-law, on which complex soft absorption (possibly a blended edge or absorption lines) and/or OVII emission are superimposed, as well as strong Fe Kα emission. The iron feature in the high-energy spectra appears broad; however, on close examination of the EPIC pn data, there exists the possibility that the broad emission feature can be attributed to a neutral Fe Kα line in addition to a blend of He- and H-like Fe Kα lines. The light curve shows a strong, hard X-ray flare concentrated in the 3–12 keV band. The flare appears to induce spectral variability, showing spectral hardening to be occuring as the flare intensifies. A detailed examination suggests that the spectral variability is most likely due to an increase in the 3–12 keV flux relative to the soft flux during the flare. A difference spectrum and complete modelling of the flare and non-flare spectra show intrinsic changes only in the normalisation of the continuum components and not in their shape parameters. The timing results are consistent with the flare originating in the accretion disc corona. The iron emission line(s) do not appear to respond to changes in the continuum flux during the flare; the iron lines are stronger in equivalent width during the low-flux (non-flare) states, and weaker during the flare.
Ending Page	38
Starting Page	29
Page Count	10
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2004/13/aa0411/aa0411.html
e-ISSN	14320746
Issue Number	1
Journal	Astronomy & Astrophysics
Volume Number	417
DOI	10.1051/0004-6361:20034411
Language	English
Publisher	EDP Sciences
Publisher Date	2004-04-01
Access Restriction	Open
Rights Holder	© ESO, 2004
Subject Keyword	galaxies: active galaxies: individual: I Zw 1 X-rays: galaxies galaxies: active / galaxies: individual: I Zw 1 / X-rays: galaxies
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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