100 citations · 528 across the 57 of their papers we have counts for
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Discovery of an Ultraviolet Counterpart to an Ultra-Fast X-ray Outflow in the Quasar PG1211+143
Gerard A. Kriss, Julia C. Lee, Ashkbiz Danehkar +5
We observed the quasar PG1211+143 using the Cosmic Origins Spectrograph on the Hubble Space Telescope in April 2015 as part of a joint campaign with the Chandra X-ray Observatory a…
The Ultra-Fast Outflow of the Quasar PG 1211+143 as Viewed by Time-Averaged Chandra Grating Spectroscopy
Ashkbiz Danehkar, Michael A. Nowak, Julia C. Lee +8
We present a detailed X-ray spectral study of the quasar PG 1211+143 based on Chandra High Energy Transmission Grating Spectrometer (HETGS) observations collected in a multi-wavele…
Mapping Excitation in the Inner Regions of the Planetary Nebula NGC 5189 using HST WFC3 Imaging
Ashkbiz Danehkar, Margarita Karovska, W. Peter Maksym +1
The planetary nebula (PN) NGC 5189 around a Wolf-Rayet [WO] central star demonstrates one of the most remarkable complex morphologies among PNe with many multi-scale structures, sh…
MPI_XSTAR: MPI-based Parallelization of the XSTAR Photoionization Program
Ashkbiz Danehkar, Michael A. Nowak, Julia C. Lee +1
We describe a program for the parallel implementation of multiple runs of XSTAR, a photoionization code that is used to predict the physical properties of an ionized gas from its e…
Electrostatic solitary waves in an electron-positron pair plasma with suprathermal electrons
Ashkbiz Danehkar
The nonlinear propagation of electrostatic solitary waves is studied in a collisionless electron-positron pair plasma consisting of adiabatic cool electrons, mobile cool positrons…
Propagation of Electron-Acoustic Waves in a Plasma with Suprathermal Electrons
Ashkbiz Danehkar
Electron-acoustic waves occur in space and laboratory plasmas where two distinct electron populations exist, namely cool and hot electrons. The observations revealed that the hot e…
Electron-acoustic solitons in an electron-beam plasma system with kappa-distributed electrons
A. Danehkar, I. Kourakis, M. A. Hellberg
We investigate the existence conditions and propagation properties of electron-acoustic solitary waves in a plasma consisting of an electron beam fluid, a cold electron fluid, and…