Suzaku Detection of the Charge Exchange Emission and Observation for the Soft X-ray Diffuse Emission

2009 ◽  
Author(s):  
N. Y. Yamasaki ◽  
K. Mitsuda ◽  
Y. Ezoe ◽  
T. Hagihara ◽  
K. Kimura ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Diffuse Emission ◽  
X Ray

Low Temperature Phase Transition (Pt) and Defect Formation (Df) in Silicon with Dioxide Inclusions Under X-Ray Irradiation

1995 ◽  
Vol 396 ◽  
Author(s):  
SH.M. Makhkamov ◽  
S.N. Abdurakhmanova
Keyword(s):  
Phase Transition ◽  
Charge Exchange ◽  
Defect Formation ◽  
Exchange Process ◽  
Temperature Phase ◽  
X Rays ◽  
Charge Exchange Process ◽  
X Ray ◽  
Temperature Phase Transition ◽  
A Charge

AbstractStudies of galvanomagnetic and electrical parameters of p- type Si : SiO2 in the temperature range 80 – 400 K have shown that X-ray irradiation at 80 K (Mo Ka,β and braking radiation hvmax. = 50 heV) leads to various transformations of the spectrum of electron- hole states in the band gap of such material, depending on the flux density of the X-rays. Two main processes are observed: the defect (vacancy and divacancy) formation and a charge exchange of native defects localized at the Si – SiO2 interface. The charge exchange process is rather collective and stimulated one because it is in response to an X-ray-induced ferroelectric phase transition in the SiO2- phase.

scholarly journals ROSAT observation of the HII region RCW 49 Possible discovery of a new Wolf-Rayet ring nebula

1995 ◽  
Vol 163 ◽  
pp. 76-77
Author(s):  
S. Mereghetti ◽  
T. Belloni
Keyword(s):  
Optical Emission ◽  
Young Star ◽  
Star Cluster ◽  
X Rays ◽  
Diffuse Emission ◽  
Hii Region ◽  
X Ray ◽  
Ring Nebula

We have observed the southern HII region RCW 49 with the ROSAT PSPC instrument. Part of the diffuse X-ray and optical emission present in this region might be associated with the X-ray selected WR star Th35-42 (WR20c). The young star cluster Westerlund 2 (which contains WR20a) is seen in X-rays as a centrally peaked, resolved source, surrounded by fainter diffuse emission.

OBSERVATION AND MODELING OF GEOCORONAL CHARGE EXCHANGE X-RAY EMISSION DURING SOLAR WIND GUSTS

2014 ◽  
Vol 796 (1) ◽  
pp. 28 ◽  
Author(s):  
B. J. Wargelin ◽  
M. Kornbleuth ◽  
P. L. Martin ◽  
M. Juda
Keyword(s):  
Solar Wind ◽  
Charge Exchange ◽  
X Ray ◽  
Wind Gusts

Observability of Stellar Winds from Late-Type Dwarfs via Charge Exchange X-Ray Emission

2001 ◽  
Vol 546 (1) ◽  
pp. L57-L60 ◽  
Author(s):  
Bradford J. Wargelin ◽  
Jeremy J. Drake
Keyword(s):  
Charge Exchange ◽  
Stellar Winds ◽  
Late Type ◽  
X Ray

scholarly journals The role of heat conduction to the formation of [WC]-type planetary nebulae

2011 ◽  
Vol 7 (S283) ◽  
pp. 494-495
Author(s):  
Christer Sandin ◽  
Matthias Steffen ◽  
Ralf Jacob ◽  
Detlef Schönberner ◽  
Ute Rühling ◽  
...  
Keyword(s):  
Heat Conduction ◽  
Chemical Composition ◽  
Physical Properties ◽  
Planetary Nebulae ◽  
Time Dependent ◽  
Diffuse Emission ◽  
Hydrodynamic Models ◽  
X Ray ◽  
Central Stars

AbstractX-ray observations of young Planetary Nebulæ (PNe) have revealed diffuse emission in extended regions around both H-rich and H-deficient central stars. In order to also reproduce physical properties of H-deficient objects, we have, at first, extended our time-dependent radiation-hydrodynamic models with heat conduction for such conditions. Here we present some of the important physical concepts, which determine how and when a hot wind-blown bubble forms. In this study we have had to consider the, largely unknown, evolution of the CSPN, the slow (AGB) wind, the fast hot-CSPN wind, and the chemical composition. The main conclusion of our work is that heat conduction is needed to explain X-ray properties of wind-blown bubbles also in H-deficient objects.

INTEGRAL results on the electron-positron annihilation radiation and X-ray & Gamma-ray diffuse emission of the Milky Way

2020 ◽  
Vol 90 ◽  
pp. 101548 ◽  
Author(s):  
Eugene Churazov ◽  
Laurent Bouchet ◽  
Pierre Jean ◽  
Elisabeth Jourdain ◽  
Jürgen Knödlseder ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Milky Way ◽  
Gamma Ray ◽  
Annihilation Radiation ◽  
Diffuse Emission ◽  
X Ray ◽  
Electron Positron Annihilation ◽  
Electron Positron

scholarly journals Diffuse X-ray emission from the Carina Nebula observed with Suzaku

2006 ◽  
Vol 2 (S237) ◽  
pp. 421-421
Author(s):  
K. Hamaguchi ◽  
R. Petre ◽  
Keyword(s):  
Ccd Camera ◽  
Diffuse Emission ◽  
The South ◽  
X Ray ◽  
The North ◽  
Large Size ◽  
Silicon Ions ◽  
Carina Nebula ◽  
Iron Abundance ◽  
Back Illuminated

AbstractThe Carina Nebula possesses the brightest soft diffuse X-ray emission among the Galactic giant HII regions, but the origin has not been known yet. The XIS1 back-illuminated CCD camera onboard the Suzaku X-ray observatory has the best spectral resolution for extended soft sources so far, and is therefore capable of measuring these key emission lines in the soft diffuse plasma. Suzaku observed the Carina nebula on 2005 Aug. 29. The XIS1 spectra of the Carina nebula clearly showed spatial variations in emission line strengths. In the south, the spectrum showed strong L-shell lines of iron ions and K-shell lines of silicon ions, while in the north these lines were much weaker. Fitting the spectra with an absorbed thin-thermal plasma model with kT ~ 0.2, 0.6 keV and NH ~ −2 × 1021 cm−2 showed that the silicon and iron abundance is about 2–3 times higher in the south than in the north. Because of its large size (~40 pc), the diffuse emission in the Carina nebula might have been produced by an old supernova, or a super shell produced by multiple supernovae.

scholarly journals Energy Spectra of the Soft X-Ray Diffuse Emission in Fourteen Fields Observed with Suzaku

2009 ◽  
Vol 61 (4) ◽  
pp. 805-823 ◽  
Author(s):  
Tomotaka Yoshino ◽  
Kazuhiasa Mitsuda ◽  
Noriko Y. Yamasaki ◽  
Yoh Takei ◽  
Toshishige Hagihara ◽  
...  
Keyword(s):  
Energy Spectra ◽  
Diffuse Emission ◽  
X Ray

scholarly journals Ablation and Wind Mass-Loading in the Born-Again Planetary Nebula A 30

2011 ◽  
Vol 7 (S283) ◽  
pp. 378-379
Author(s):  
Martín A. Guerrero ◽  
You-Hua Chu ◽  
Wolf-Rainer Hamann ◽  
Lidia Oskinova ◽  
Detlef Schönberner ◽  
...  
Keyword(s):  
Stellar Wind ◽  
Planetary Nebula ◽  
Central Star ◽  
Mass Loading ◽  
Diffuse Emission ◽  
X Ray ◽  
Thermal Pulse ◽  
Born Again

AbstractWe present XMM-Newton and Chandra observations of the born-again planetary nebula A 30. These X-ray observations reveal a bright unresolved source at the position of the central star whose X-ray luminosity exceeds by far the model expectations for photospheric emission and for shocks within the stellar wind. We suggest that a “born-again hot bubble” may be responsible for this X-ray emission. Diffuse X-ray emission associated with the petal-like features and one of the H-poor knots seen in the optical is also found. The weakened emission of carbon lines in the spectrum of the diffuse emission can be interpreted as the dilution of stellar wind by mass-loading or as the detection of material ejected during a very late thermal pulse.

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