He-like Ions as Practical Astrophysical Plasma Diagnostics: From Stellar Coronae to Active Galactic Nuclei

Porquet, D.; Dubau, J.; Grosso, N.

doi:10.1007/978-1-4419-9884-2_8

Cited by 9 publications

(12 citation statements)

References 142 publications

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“…K-shell spectra, including resonance lines of Hydrogen (1s-np, n > 2) and Helium (1s 2 -1snp, n > 2) like ions (H-like and He-like) along with associated satellites are particularly interesting because the spectrum is relatively simple and easy to model. High precision numerical calculations of various atomic characteristics make these spectra a convenient tool for the investigation of physical processes occurring in the solar corona [12].These resonance lines, also known as ionic lines, are due to the transition of electrons in highly charged species present in plasma such as H-like, He-like etc. There has been considerable interest in satellite emission appearing on the long wavelength side of resonance lines.…”

Section: Introductionmentioning

confidence: 99%

K-shell X-ray spectroscopy of laser produced aluminum plasma

Kaur

Chaurasia

Poswal

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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Optimization of a laser produced plasma (LPP) X-ray source has been performed by analyzing K-shell emission spectra of Al plasma at a laser intensity of 10 13-10 14 W/cm 2. The effect of varying the laser intensity on the emissivity of the K-shell resonance lines is studied and found to follow a power law, E α I α with α=2.2, 2.3, 2.4 for He β , He γ , He δ respectively. The emission of these resonance lines has been found to be heavily anisotropic. A Python language based code has been developed to generate an intensity profile of K-shell spectral lines from the raw data. In theoretical calculations, the temperature is estimated by taking the ratio of the Li-like satellite (1s 2 2p-1s2p3p) and the He β (1s 2-1s3p) resonance line and the ratio of the He-like satellite (1s2p-2p 2) and the Ly α (1s-2p) resonance line. To determine the plasma density, stark broadening of the Ly β spectral line is used. Simulation was carried out using the FLYCHK code to generate a synthetic emission spectrum. The results obtained by FLYCHK are T e =160 eV, T h =1 keV, f=0.008, n e =5 x 10 20 cm-3 and the analytical model resulted T e =260-419 eV and n e =3x10 20 cm-3 .

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Section: Introductionmentioning

confidence: 99%

K-shell X-ray spectroscopy of laser produced aluminum plasma

Kaur

Chaurasia

Poswal

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Since high resolution X-ray spectroscopy can resolve the line features in detail, we describe here the characteristics of transitions in some detail. A detailed account of the properties of He-like ions is given by a review paper Porquet et al (2010). In n = 2 to n = 1 transitions, with n the principal quantum number, there are four strong emission lines, namely resonance (w), forbidden (z), and two intercombination lines (x and y).…”

Section: He-like Ionsmentioning

confidence: 99%

High-resolution X-ray spectroscopy of astrophysical plasmas with X-ray microcalorimeters

Ezoe

Ohashi

Mitsuda

2021

Rev. Mod. Plasma Phys.

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High spectral resolution with a resolving power, $$E/\Delta E \gtrsim 1000$$ E / Δ E ≳ 1000 at 6 keV, is now available in X-ray astronomy. X-ray observations are particularly effective for plasma studies since major atomic transitions appear as spectral features in the X-ray band. High-resolution spectroscopy enables us to probe a wide variety of astrophysical plasmas, which are not obtainable from ground experiments, regarding their temperature, density, magnetic field, gravity, and velocity. In this review, we describe what are the X-ray emitting plasmas in the Universe, along with basic plasma diagnostics, and depict historical development of the techniques used for the X-ray spectroscopy. We outline the X-ray microcalorimeter instrument, soft X-ray spectrometer (SXS), onboard the ASTRO-H satellite. Despite the short lifetime of the satellite in orbit for about a month, observations with the SXS have shown the remarkable power of high-resolution spectroscopy in X-ray astronomy. Observed spectrum of the hot plasma in the core region of the Perseus cluster showed He-like Fe K-line to be clearly resolved into resonance, forbidden and intercombination lines for the first time. The line width indicates that the turbulent pressure amounts to only 4% of the thermal pressure of the plasma. We also describe new findings and constraints obtained from the superb spectrum of the Perseus cluster, which all indicate a great potential of X-ray spectroscopy. The recovery of the spectroscopy science of ASTRO-H is aimed at with XRISM, a Japanese mission planned for launch in early 2020s. In further future, Athena will expand the rich science with its high sensitivity and spectral resolution in early 2030s.

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“…Gabriel and Jordan's method has been widely used for different regions of the solar corona [93,94,95,96] and given its great potential, there have also been many efforts to extend it to different astrophysical plasmas, such as planetary nebulae [97] and stellar winds and coronae [98,99,100,101]. However, this method is only valid at relatively low ion densities (n i < 10 12 − 10 13 cm −3 ), as for higher densities there is no emission from the x and z lines.…”

Section: Interest Of the He−α Complexmentioning

confidence: 99%

Spectroscopic characterisation of the effects of plasma geometry on the angular distribution of X-Ray emission in HED plasmas

Perez-Callejo¹

2020

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The author gratefully acknowledges support from Lawrence Livermore National Laboratory under grant number B617350. The author wants to thank the experimental crew of the Omega laser at the University of Rochester Laboratory for Laser Energetics for expertly executing the experiments described here. The targets for those experiments were fabricated by General Atomics thanks to support from the National Nuclear Security Administration under contract DE-NA0001808.

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He-like Ions as Practical Astrophysical Plasma Diagnostics: From Stellar Coronae to Active Galactic Nuclei

Cited by 9 publications

References 142 publications

K-shell X-ray spectroscopy of laser produced aluminum plasma

K-shell X-ray spectroscopy of laser produced aluminum plasma

High-resolution X-ray spectroscopy of astrophysical plasmas with X-ray microcalorimeters

Spectroscopic characterisation of the effects of plasma geometry on the angular distribution of X-Ray emission in HED plasmas

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