X-ray CX code we could study (trac #368)

reported by: @CloudyLex

Title:  
Plasma code for astrophysical charge exchange emission at X-ray wavelengths
Authors:    
Gu, Liyi; Kaastra, Jelle; Raassen, A. J. J.
Affiliation:    
AA(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, 
Utrecht, The Netherlands L.Gu@sron.nl), AB(SRON Netherlands Institute for 
Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands; Leiden 
Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands), 
AC(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, 
Utrecht, The Netherlands; Astronomical Institute "Anton Pannekoek", University 
of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands)

Publication:    
Astronomy & Astrophysics, Volume 588, id.A52, 11 pp. (A&A Homepage)
Publication Date:   
04/2016
Origin: 
EDP Sciences
Astronomy Keywords: 
atomic data, atomic processes, comets: individual: C/2000 WM1 (LINEAR)
DOI:    
10.1051/0004-6361/201527615
Bibliographic Code: 
2016A&A...588A..52G
Abstract

Charge exchange X-ray emission provides unique insight into the interactions 
between cold and hot astrophysical plasmas. Besides its own profound science, 
this emission is also technically crucial to all observations in the X-ray band, since 
charge exchange with the solar wind often contributes a significant foreground 
component that contaminates the signal of interest. By approximating the cross 
sections resolved to n and l atomic subshells and carrying out complete radiative 
cascade calculation, we have created a new spectral code to evaluate the charge 
exchange emission in the X-ray band. Compared to collisional thermal emission, 
charge exchange radiation exhibits enhanced lines from large-n shells to the 
ground, as well as large forbidden-to-resonance ratios of triplet transitions. Our 
new model successfully reproduces an observed high-quality spectrum of comet 
C/2000 WM1 (LINEAR), which emits purely by charge exchange between solar wind ions and cometary neutrals. It demonstrates that a proper charge exchange 
model will allow us to probe the ion properties remotely, including charge state, 
dynamics, and composition, at the interface between the cold and hot plasmas.

Migrated from https://www.nublado.org/ticket/368

{
    "status": "new",
    "changetime": "2019-02-04T13:02:49Z",
    "_ts": "1549285369825011",
    "description": "{{{\nTitle:\t\nPlasma code for astrophysical charge exchange emission at X-ray wavelengths\nAuthors:\t\nGu, Liyi; Kaastra, Jelle; Raassen, A. J. J.\nAffiliation:\t\nAA(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, \nUtrecht, The Netherlands L.Gu@sron.nl), AB(SRON Netherlands Institute for \nSpace Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands; Leiden \nObservatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands), \nAC(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, \nUtrecht, The Netherlands; Astronomical Institute \"Anton Pannekoek\", University \nof Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands)\n\nPublication:\t\nAstronomy & Astrophysics, Volume 588, id.A52, 11 pp. (A&A Homepage)\nPublication Date:\t\n04/2016\nOrigin:\t\nEDP Sciences\nAstronomy Keywords:\t\natomic data, atomic processes, comets: individual: C/2000 WM1 (LINEAR)\nDOI:\t\n10.1051/0004-6361/201527615\nBibliographic Code:\t\n2016A&A...588A..52G\nAbstract\n\nCharge exchange X-ray emission provides unique insight into the interactions \nbetween cold and hot astrophysical plasmas. Besides its own profound science, \nthis emission is also technically crucial to all observations in the X-ray band, since \ncharge exchange with the solar wind often contributes a significant foreground \ncomponent that contaminates the signal of interest. By approximating the cross \nsections resolved to n and l atomic subshells and carrying out complete radiative \ncascade calculation, we have created a new spectral code to evaluate the charge \nexchange emission in the X-ray band. Compared to collisional thermal emission, \ncharge exchange radiation exhibits enhanced lines from large-n shells to the \nground, as well as large forbidden-to-resonance ratios of triplet transitions. Our \nnew model successfully reproduces an observed high-quality spectrum of comet \nC/2000 WM1 (LINEAR), which emits purely by charge exchange between solar wind ions and cometary neutrals. It demonstrates that a proper charge exchange \nmodel will allow us to probe the ion properties remotely, including charge state, \ndynamics, and composition, at the interface between the cold and hot plasmas.\n}}}",
    "reporter": "gary",
    "cc": "",
    "resolution": "",
    "time": "2016-09-02T21:50:19Z",
    "component": "atomic/molecular data base",
    "summary": "X-ray CX code we could study",
    "priority": "good to do",
    "keywords": "",
    "version": "trunk",
    "milestone": "no milestone",
    "owner": "nobody",
    "type": "enhancement"
}

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X-ray CX code we could study (trac #368) #370