scholarly journals X-Ray Polarization Spectroscopy of Heα Line Emission for Diagnosis of the Anisotropy of Hot Electrons

2007 ◽  
Vol 2 ◽  
pp. 013-013 ◽  
Author(s):  
Yuichi INUBUSHI ◽  
Takeshi KAI ◽  
Tohru KAWAMURA ◽  
Shinsuke FUJIOKA ◽  
Hiroaki NISHIMURA ◽  
...  
Keyword(s):  
Line Emission ◽  
Hot Electrons ◽  
Polarization Spectroscopy ◽  
X Ray

X-ray polarization spectroscopy for measurement of anisotropy of hot electrons generated with ultraintense laser pulse

2004 ◽  
Vol 75 (10) ◽  
pp. 3699-3701 ◽  
Author(s):  
Yuichi Inubushi ◽  
Hiroaki Nishimura ◽  
Masayuki Ochiai ◽  
Shinsuke Fujioka ◽  
Yasukazu Izawa ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Hot Electrons ◽  
Polarization Spectroscopy ◽  
X Ray

Iron K-Line Emission from X-Ray Binaries

1988 ◽  
Vol 102 ◽  
pp. 47-50
Author(s):  
K. Masai ◽  
S. Hayakawa ◽  
F. Nagase
Keyword(s):  
Accretion Disk ◽  
Radiative Recombination ◽  
Characteristic Temperature ◽  
Line Emission ◽  
Ionization Front ◽  
Continuum Radiation ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

AbstractEmission mechanisms of the iron Kα-lines in X-ray binaries are discussed in relation with the characteristic temperature Txof continuum radiation thereof. The 6.7 keV line is ascribed to radiative recombination followed by cascades in a corona of ∼ 100 eV formed above the accretion disk. This mechanism is attained for Tx≲ 10 keV as observed for low mass X-ray binaries. The 6.4 keV line observed for binary X-ray pulsars with Tx> 10 keV is likely due to fluorescence outside the He II ionization front.

scholarly journals Silicon in the solar corona

1965 ◽  
Vol 23 ◽  
pp. 115-123
Author(s):  
K. G. Widing ◽  
J. R. Porter
Keyword(s):  
Solar Corona ◽  
Relative Intensity ◽  
Line Emission ◽  
X Ray ◽  
Resonance Transitions ◽  
Spectral Ranges

Resonance lines of coronal ions of silicon are prominent in the spectral ranges 40–62 Å and 254–356 Å.An unexpected feature of the soft X-ray spectrum is the weakness or absence of the resonance lines of iron in ionization stages XI through XV.A second feature is the prominence of lines of the type (3d → 2p) relative to the resonance transitions (3p → 2s) in Li-like and Beryllium-like spectra. It is suggested that the upper levels (3d) are excited by quadrupole collisions from the ground 2s or 2s2levels.The intensity of the soft X-ray lines relative to the resonance lines in the 300 Å region seems to be more consistent with temperatures well above one million degrees than with temperatures as low as 700000°K, but the data are not adequate for a precise comparison. The relative intensity of the line emission from the various stages of silicon ionization may be interpreted as indicating that the ionization of silicon peaks in stages IX and X.The abundances of C, Mg, S, and Al relative to silicon do not seem to be greatly different from the chromospheric abundances reported by Pottasch or with the photospheric abundances.

scholarly journals X-ray Properties of 3C 111: Separation of Primary Nuclear Emission and Jet Continuum

Universe ◽  
2020 ◽  
Vol 6 (11) ◽  
pp. 219
Author(s):  
Elena Fedorova ◽  
B.I. Hnatyk ◽  
V.I. Zhdanov ◽  
A. Del Popolo
Keyword(s):  
Accretion Disk ◽  
Power Law ◽  
Line Emission ◽  
High Energy ◽  
Power Law Model ◽  
X Ray ◽  
Additional Information ◽  
Observational Dataset ◽  
Simple Power ◽  
Photon Index

3C111 is BLRG with signatures of both FSRQ and Sy1 in X-ray spectrum. The significant X-ray observational dataset was collected for it by INTEGRAL, XMM-Newton, SWIFT, Suzaku and others. The overall X-ray spectrum of 3C 111 shows signs of a peculiarity with the large value of the high-energy cut-off typical rather for RQ AGN, probably due to the jet contamination. Separating the jet counterpart in the X-ray spectrum of 3C 111 from the primary nuclear counterpart can answer the question is this nucleus truly peculiar or this is a fake “peculiarity” due to a significant jet contribution. In view of this question, our aim is to estimate separately the accretion disk/corona and non-thermal jet emission in the 3C 111 X-ray spectra within different observational periods. To separate the disk/corona and jet contributions in total continuum, we use the idea that radio and X-ray spectra of jet emission can be described by a simple power-law model with the same photon index. This additional information allows us to derive rather accurate values of these contributions. In order to test these results, we also consider relations between the nuclear continuum and the line emission.

Time-dependent X-ray polarization analysis for anisotropic distribution of hot electrons in ultrahigh intensity laser plasmas

2007 ◽  
Vol 3 (1-2) ◽  
pp. 131-135 ◽  
Author(s):  
T. Kai ◽  
T. Kawamura ◽  
Y. Inubushi ◽  
H. Nishimura ◽  
T. Nakamura ◽  
...  
Keyword(s):  
Time Dependent ◽  
Hot Electrons ◽  
Polarization Analysis ◽  
X Ray ◽  
Laser Plasmas ◽  
Intensity Laser

X‐ray tomography of hot electrons in the barrier region of the tandem mirror GAMMA 10

1990 ◽  
Vol 67 (4) ◽  
pp. 1694-1699 ◽  
Author(s):  
T. Kondoh ◽  
T. Cho ◽  
M. Hirata ◽  
N. Yamaguchi ◽  
T. Saito ◽  
...  
Keyword(s):  
Hot Electrons ◽  
X Ray ◽  
Tandem Mirror ◽  
Barrier Region

scholarly journals Influence of hot electrons on the spectra of iron plasma irradiated by femtosecond laser pulses with 1021 W/cm2 intensities

2017 ◽  
Vol 35 (1) ◽  
pp. 92-99 ◽  
Author(s):  
A. Stafford ◽  
A.S. Safronova ◽  
A.Ya. Faenov ◽  
T.A. Pikuz ◽  
R. Kodama ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Time Frame ◽  
Femtosecond Laser Pulses ◽  
Hot Electrons ◽  
Plasma Radiation ◽  
X Ray ◽  
Laser Plasma Interaction ◽  
Multiply Charged ◽  
Interaction Experiment ◽  
Charged Ions

AbstractThe use of laboratory experiments as plasma creating sources is a valuable tool for understanding astrophysical observations. Recently plasma created through irradiation by lasers with relativistic intensities has been used to study effects of hot electrons and X-ray pumping on X-ray formation of multiply charged ions spectra. This paper discusses the formation of K-shell Fe spectra recorded from a plasma irradiated by 35 fs pulses with intensities of 1021 W/cm2. Modeling of the spectra suggests three different regions of plasma radiation including a cold ~10 eV region, a mild ~700 eV region, and a hot ~3500 eV region. The influence of hot electrons and X-ray pumping is discussed and a comparison with K-shell Fe spectra from a 1 MA X-pinch experiment is included to highlight the differences due to the shorter time frame of the laser–plasma interaction experiment.

scholarly journals Measurement and interpretation of the polarization of the x-ray line emission of heliumlike Fe XXV excited by an electron beam

1996 ◽  
Vol 53 (6) ◽  
pp. 3974-3981 ◽  
Author(s):  
P. Beiersdorfer ◽  
D. A. Vogel ◽  
K. J. Reed ◽  
V. Decaux ◽  
J. H. Scofield ◽  
...  
Keyword(s):  
Electron Beam ◽  
Line Emission ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document