X-ray diagnostics of cosmic photoionized plasmas

1995 ◽  
Author(s):  
T. R. Kallman
Keyword(s):  
X Ray ◽  
2004 ◽  
Vol 426 (3) ◽  
pp. 767-776 ◽  
Author(s):  
O. Godet ◽  
S. Collin ◽  
A.-M. Dumont
Keyword(s):  
X Ray ◽  

2018 ◽  
Vol 97 (6) ◽  
Author(s):  
S. White ◽  
R. Irwin ◽  
J. R. Warwick ◽  
G. F. Gribakin ◽  
G. Sarri ◽  
...  

2019 ◽  
Vol 15 (S350) ◽  
pp. 321-325
Author(s):  
S. White ◽  
R. Irwin ◽  
R. Warwick ◽  
G. Sarri ◽  
G. F. Gribakin ◽  
...  

AbstractImplementation of a novel experimental approach using a bright source of narrowband x-ray emission has enabled the production of a photoionized argon plasma of relevance to astrophysical modelling codes such as Cloudy. We present results showing that the photoionization parameter ζ = 4πF/ne generated using the VULCAN laser was ≈ 50 erg cm s−1, higher than those obtained previously with more powerful facilities. Comparison of our argon emission-line spectra in the 4.15 - 4.25 Å range at varying initial gas pressures with predictions from the Cloudy code and a simple time-dependent code are also presented. Finally we briefly discuss how this proof-of-principle experiment may be scaled to larger facilities such as ORION to produce the closest laboratory analogue to a photoionized plasma.


2015 ◽  
Vol 22 (4) ◽  
pp. 043302 ◽  
Author(s):  
A. Bartnik ◽  
P. Wachulak ◽  
T. Fok ◽  
Ł. Węgrzyński ◽  
H. Fiedorowicz ◽  
...  

1990 ◽  
Vol 350 ◽  
pp. L37 ◽  
Author(s):  
Duane A. Liedahl ◽  
Steven M. Kahn ◽  
Albert L. Osterheld ◽  
William H. Goldstein

2015 ◽  
Vol 23 (2) ◽  
Author(s):  
A. Bartnik

AbstractIn this work a review of investigations concerning interaction of intense extreme ultraviolet (EUV) and soft X-ray (SXR) pulses with matter is presented. The investigations were performed using laser-produced plasma (LPP) EUV/SXR sources based on a double stream gas puff target. The sources are equipped with dedicated collectors allowing for efficient focusing of the EUV/SXR radiation pulses. Intense radiation in a wide spectral range, as well as a quasi-monochromatic radiation can be produced. In the paper different kinds of LPP EUV/SXR sources developed in the Institute of Optoelectronics, Military University of Technology are described.Radiation intensities delivered by the sources are sufficient for different kinds of interaction experiments including EUV/SXR induced ablation, surface treatment, EUV fluorescence or photoionized plasma creation. A brief review of the main results concerning this kind of experiments performed by author of the paper are presented. However, since the LPP sources cannot compete with large scale X-ray sources like synchrotrons, free electron lasers or high energy density plasma sources, it was indicated that some investigations not requiring extreme irradiation parameters can be performed using the small scale installations. Some results, especially concerning low temperature photoionized plasmas are very unique and could be hardly obtained using the large facilities.


2000 ◽  
Vol 195 ◽  
pp. 77-87
Author(s):  
H. Kunieda

Recent X-ray satellite observations provide plenty of spectral information with high resolution in a broad band. Major results from the spectral observations are related to the interaction of the power-law continuum flux with the ambient plasmas and accretion disks. The most prominent result is the broad iron-line feature from Seyfert I galaxies which is interpreted as the emission from the relativistic accretion disk. Doppler shift and boosting, as well as gravitational redshifts, are considerable at the distance of several Schwarzschild radii from the central black hole. Strong radiation from the central engine ionizes the ambient material of AGN. Edge structure found at around 0.8 keV is attributed to highly ionized oxygen of O VII and O VIII. Some iron emission lines from Seyfert II galaxies are emitted by highly photoionized plasmas. The study of fast temporal and spectral variability is the key approach to examine the emission mechanism and structure of the central vicinity of AGN. In 2000, two X-ray observatories (Chandra and XMM will be in orbit, and they will provide us with deeper insights of the physics around the black holes and of the physics of hot plasmas.


2004 ◽  
Vol 414 (3) ◽  
pp. 979-992 ◽  
Author(s):  
S. Coupé ◽  
O. Godet ◽  
A.-M. Dumont ◽  
S. Collin
Keyword(s):  
X Ray ◽  

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