Kewei Wu

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Nanostructured ZnO is considered to be a promising building block in the design of nanoscale optoelectronic devices. It usually shows dominant donor-bound exciton (DX) emission at low temperatures. In this study, ZnO nanorods with high crystallinity and optical quality were grown by metal-organic chemical vapor deposition on a-plane sapphire (1120)(More)
We present an XMM-Newton observation of the Seyfert-LINER galaxy NGC 7213. The RGS soft X-ray spectrum is well fitted with a power law plus soft X-ray collisionally ionised thermal plasma (kT = 0.18 +0.03 −0.01 keV). We confirm the presence of Fe I, XXV and XXVI Kα emission in the EPIC spectrum and set tighter constraints on their equivalent widths of 82(More)
We present spectral and timing results from a long (130 ks) XMM-Newton EPIC observation of the nucleus of the Seyfert/LINER galaxy M 81. During the observation the X-ray flux varied by 20%, but there was no significant change in spectral shape. The 2–10 keV spectrum is well described by a power law continuum and three narrow Fe Kα emission lines at 6.4, 6.7(More)
We present the soft X–ray spectrum of the LINER galaxy M81 derived from a long observation with the XMM-Newton RGS. The spectrum is dominated by continuum emission from the active nucleus, but also contains emission lines from Fe L, and H-like and He-like N, O, and Ne. The emission lines are significantly broader than the RGS point-source spectral(More)
We examine the XMM X-ray spectrum of the LINER-AGN NGC 7213, which is best fit with a power law, Kα emission lines from Fe I, Fe XXV and Fe XXVI and a soft X-ray collisionally ionised thermal plasma with kT = 0.18 +0.03 −0.01 keV. We find a luminosity of 7×10 −4 L Edd , and a lack of soft X-ray excess emission, suggesting a truncated accretion disc. NGC(More)
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