67 citations · 550 across the 21 of their papers we have counts for
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X-ray spectra of the Fe-L complex III: systematic uncertainties in the atomic data
Liyi Gu, Chintan Shah, Junjie Mao +14
There has been a growing request from the X-ray astronomy community for a quantitative estimate of systematic uncertainties originating from the atomic data used in plasma codes. T…
Uncertainties in Atomic Data for Modeling Astrophysical Charge Exchange Plasmas
Liyi Gu, Chintan Shah, Ruitian Zhang
Relevant uncertainties on theoretical atomic data are vital to determine the accuracy of plasma diagnostics in a number of areas including in particular the astrophysical study. We…
Fe XVII - line ratio diagnostic of shock formation radius in O stars
Gabriel J. Grell, Maurice A. Leutenegger, Chintan Shah
The - lines of Fe XVII in the X-ray spectrum of the O-type star Puppis exhibit an anomalous (3G + M2)/(3F) line ratio of 1.4, in comparison with 2.4 for alm…
X-ray spectra of the Fe-L complex II: atomic data constraints from EBIT experiment and X-ray grating observations of Capella
Liyi Gu, Chintan Shah, Junjie Mao +14
The Hitomi results for the Perseus cluster have shown that accurate atomic models are essential to the success of X-ray spectroscopic missions, and just as important as knowledge o…
X-ray spectra of the Fe-L complex
Liyi Gu, A. J. J. Raassen, Junjie Mao +7
The Hitomi results on the Perseus cluster lead to improvements in our knowledge of atomic physics which are crucial for the precise diagnostic of hot astrophysical plasma observed…
Revisiting the Fe XVII line emission problem: laboratory measurements of the 3s-2p and 3d-2p line-formation channels
Chintan Shah, José R. Crespo López-Urrutia, Ming Feng Gu +5
We determined relative X-ray photon emission cross sections in Fe XVII ions that were mono-energetically excited in an electron beam ion trap. Line formation for the 3s (3s-2p) and…
Polarization of K-shell dielectronic recombination satellite lines of Fe XIX-XXV and its application for diagnostics of anisotropies of hot plasmas
Chintan Shah, Pedro Amaro, René Steinbrügge +3
We present a systematic measurement of the X-ray emission asymmetries in the K-shell dielectronic, trielectronic, and quadruelectronic recombination of free electrons into highly c…
Charge exchange in galaxy clusters
Liyi Gu, Junjie Mao, Jelle de Plaa +3
Though theoretically expected, the charge exchange emission from galaxy clusters has not yet been confidently detected. Accumulating hints were reported recently, including a rathe…
Laboratory measurements compellingly support charge-exchange mechanism for the 'dark matter' 3.5 keV X-ray line
Chintan Shah, Stepan Dobrodey, Sven Bernitt +4
The reported observations of an unidentified X-ray line feature at 3.5 keV have driven a lively discussion about its possible dark matter origin. Motivated by this, we have m…