Kavli Affiliate: Susan Clark | First 5 Authors: Kai-Mei C. Fu, Wenzheng Yeo, Susan Clark, Charles Santori, Colin Stanley | Summary: We observe millisecond spin-flip relaxation times of donor-bound electrons in high-purity n-GaAs . This is three orders of magnitude larger than previously reported lifetimes in n-GaAs . Spin-flip times are measured as a function […]
Kavli Affiliate: Steven M. Kahn | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We fit the Doppler profiles of the He-like triplet complexes of ion{O}{7} and ion{N}{6} in the X-ray spectrum of the O star $zeta$ Puppis, using XMM-Newton RGS data collected over $sim 400$ ks of exposure. We find that they […]
Kavli Affiliate: Steven M. Kahn | First 5 Authors: Maurice A. Leutenegger, Stanley P. Owocki, Steven M. Kahn, Frits B. S. Paerels, | Summary: We fit the Doppler profiles of the He-like triplet complexes of ion{O}{7} and ion{N}{6} in the X-ray spectrum of the O star $zeta$ Puppis, using XMM-Newton RGS data collected over $sim […]
Kavli Affiliate: Seth W. Digel | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: Methods based on hypothesis tests (HTs) in the Haar domain are widely used to denoise Poisson count data. Facing large datasets or real-time applications, Haar-based denoisers have to use the decimated transform to meet limited-memory or computation-time constraints. Unfortunately, […]
Kavli Affiliate: Grzegorz M. Madejski | First 5 Authors: Yoh Takei, Takaya Ohashi, J. Patrick Henry, Kazuhisa Mitsuda, Ryuichi Fujimoto | Summary: We searched for redshifted O emission lines from the possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the XIS instrument on Suzaku. This cluster is thought to […]
Kavli Affiliate: Seth W. Digel | First 5 Authors: Igor V. Moskalenko, Troy A. Porter, Seth W. Digel, , | Summary: We study the inverse Compton scattering of solar photons by Galactic cosmic-ray electrons. We show that the gamma-ray emission from this process is substantial with the maximum flux in the direction of the Sun; […]
Kavli Affiliate: Steven M. Kahn | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We present results from quantitative modeling and spectral analysis of the high mass X-ray binary Vela X-1 obtained with the Chandra HETGS. The spectra exhibit emission lines from H-like and He-like ions driven by photoionization, as well as fluorescent […]
Kavli Affiliate: Steven M. Kahn | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We present results from quantitative modeling and spectral analysis of the high mass X-ray binary Vela X-1 obtained with the Chandra HETGS. The spectra exhibit emission lines from H-like and He-like ions driven by photoionization, as well as fluorescent […]
Kavli Affiliate: Steven M. Kahn | First 5 Authors: Maurice A. Leutenegger, Frits B. S. Paerels, Steven M. Kahn, David H. Cohen, | Summary: We discuss new methods of measuring and interpreting the forbidden-to-intercombination line ratios of helium-like triplets in the X-ray spectra of O-type stars, including accounting for the spatial distribution of the X-ray […]
Kavli Affiliate: Andrew P. Rasmussen | First 5 Authors: Andrew P. Rasmussen, Steven M. Kahn, Frits Paerels, Jan Willem den Herder, Jelle Kaastra | Summary: In a series of papers, Nicastro et al. have reported the detection of z>0 OVII absorption features in the spectrum of Mrk421 obtained with the Chandra Low Energy Transmission Grating […]