Investigating the Hardest X-ray Narrow-Line Seyfert 1s

Physics

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Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Sdss J1430-0011, Xmm-Newton Proposal 05015402

Scientific paper

Narrow-line Seyfert 1 galaxies (NLS1s) are an interesting subclass of type 1 AGN thought to have low black hole masses and high accretion rates. This has long been invoked to explain their unusual optical properties (narrow, strong Hbeta relative to OIII, strong FeII) as well as their typically bright, ultrasoft X-ray spectra. However, our recent Chandra study found that a few NLS1s actually have faint, hard X-ray spectra. We now propose to obtain deep EPIC spectra of the two hardest NLS1s in our Chandra sample, thereby determining whether this hardness is intrinsic to the AGN emission or instead due to absorption. The results of this study will not only affect the NLS1 paradigm, but also our understanding of formation and evolution of AGNs in general.

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