scholarly journals Models for X-ray Emission from Tycho’s Remnant

1988 ◽  
Vol 101 ◽  
pp. 133-136
Author(s):  
Barham W. Smith ◽  
Eric M. Jones
Keyword(s):  
Spectral Data ◽  
Hydrodynamic Model ◽  
Thermal Conduction ◽  
Spherically Symmetric ◽  
Hydrodynamic Models ◽  
X Ray ◽  
Emission Properties ◽  
Circumstellar Medium

AbstractWe reexamine the X-ray emission from Tycho’s remnant using results from hydrodynamic models computed with a detailed spherically symmetric code. The observed synchrotron radio contours (Green and Gull 1983) appear to require a cloudy circumstellar medium (Dickel and Jones, 1985; Dickel, Eilek, and Jones 1987), thus we explore the X-ray emission properties of similar models. We find that they tend to produce broad shells of X-ray emission that resemble the observed X-ray map of Tycho (Seward, Gorenstein, and Tucker 1983). A simple hydrodynamic model can satisfy both radio and X-ray observations, but it has little similarity to the evolution of remnants in cloudy media dominated by thermal conduction (McKee and Ostriker 1977). More work needs to be done to ensure that the spectrum as well as the X-ray map can be modeled with the same cloudy circumstellar medium, although we believe it will not be difficult to obtain as good a statistical agreement with the spectral data as other models have achieved (e.g. Hamilton, Sarazin, and Szymkowiak 1986).

scholarly journals Hydrodynamical Model of X-Ray Emitting Gas Around Elliptical Galaxies

1998 ◽  
Vol 188 ◽  
pp. 286-286
Author(s):  
Ryo Saito ◽  
Toshikazu Shigeyama
Keyword(s):  
Thermal Conduction ◽  
Thermal Instability ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Elliptical Galaxies ◽  
Time Dependent ◽  
Radiative Cooling ◽  
Spherically Symmetric ◽  
X Ray ◽  
Type Ia

We have performed spherically symmetric, time-dependent hydrodynamical calculations for the X-ray emitting gas around elliptical galaxies, NGC4472, for the purpose to reproduce profiles of temperature and density. Stellar mass loss rate and type Ia supernova rate are assumed to be constant. Thermal conduction is introduced to stabilize against thermal instability due to radiative cooling.

scholarly journals An interpretation of the overionized plasma in supernova remnant W49B

2013 ◽  
Vol 9 (S296) ◽  
pp. 364-365
Author(s):  
Xin Zhou ◽  
Marco Miceli ◽  
Fabrizio Bocchino ◽  
Salvatore Orlando ◽  
Yang Chen ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Hydrodynamic Model ◽  
Thermal Conduction ◽  
Radiative Recombination ◽  
Supernova Remnant ◽  
Primary Result ◽  
X Ray ◽  
Hot Plasma ◽  
Simulation Results ◽  
First Time

AbstractW49B is a mixed-morphology supernova remnant (SNR) with the presence of enhanced abundances and overionization confirmed by X-ray observation. For the overionization, a strong radiative recombination continuum (RRC) has been detected and confirmed by SUZAKU and XMM-Newton. Here, we investigate these intriguing observational results through a multidimensional hydrodynamic model that takes into account, for the first time, the mixing of ejecta with the circumstellar and interstellar medium, thermal conduction, and non-equilibrium ionization. The model can reproduce the morphology and the overionization pattern of W49B. We found that the overionized plasma originates from the rapid cooling of the hot plasma originally heated by the shock reflected from the dense ring-like cloud. In addition, based on the most updated ATOMDB (v2.0.2), we calculated the spectrum of one cell in the overionized region from the simulation results at present. We got the overionized spectrum that is in agreement with the observational results. Thus, our primary result indicates that the model is consistent with the observations both spatially and spectrally.

Synthesis of 4-(3-coumarinyl)-3-benzyl-4-thiazolin-2-one 4-methylbenzylidenehydrazone and determination of the isomeric structure by X-ray analysis

2003 ◽  
Vol 218 (12) ◽  
Author(s):  
Süheyla Özbey ◽  
Nilgün Karalı ◽  
Aysel Gürsoy
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Spectral Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Isomeric Structure ◽  
Elemental Analyses

AbstractIn this study 4-(3-coumarinyl)-3-benzyl-4-thi azolin-2-one 4-methylbenzylidenehydrazone 3 was synthesised. An independent proof of the thiazolylhydrazone structure of 3 was achieved by single crystal X-ray diffraction analysis. Elemental analyses and spectral data (IR,

scholarly journals Doppler Tomography in 2D and 3D of the X-ray Binary Cyg X-1 for June 2007

2011 ◽  
Vol 7 (S282) ◽  
pp. 201-202 ◽  
Author(s):  
O. I. Sharova ◽  
M. I. Agafonov ◽  
E. A. Karitskaya ◽  
N. G. Bochkarev ◽  
S. V. Zharikov ◽  
...  
Keyword(s):  
Binary System ◽  
Spectral Data ◽  
Inclination Angle ◽  
Tomographic Reconstruction ◽  
Orbital Plane ◽  
National Observatory ◽  
Doppler Tomography ◽  
X Ray ◽  
2D And 3D ◽  
First Time

AbstractThe 2D and 3D Doppler tomograms of X-ray binary system Cyg X-1 (V1357 Cyg) were reconstructed from spectral data for the line HeII 4686Å obtained with 2-m telescope of the Peak Terskol Observatory (Russia) and 2.1-m telescope of the Mexican National Observatory in June, 2007. Information about gas motions outside the orbital plane, using all of the three velocity components Vx, Vy, Vz, was obtained for the first time. The tomographic reconstruction was carried out for the system inclination angle of 45°. The equal resolution (50 × 50 × 50 km/s) is realized in this case, in the orbital plane (Vx, Vy) and also in the perpendicular direction Vz. The checkout tomograms were realized also for the inclination angle of 40° because of the angle uncertainty. Two versions of the result showed no qualitative discrepancy. Details of the structures revealed by the 3D Doppler tomogram were analyzed.

A novel cyclocondensation of xanthates containing active methylene groups with isothiocyanates. Spectral data and X-ray structures of the products

Tetrahedron ◽  
1992 ◽  
Vol 48 (33) ◽  
pp. 6863-6874 ◽  
Author(s):  
G.V. Tormos ◽  
V.Yu. Khodorkovsky ◽  
O.Ya. Neilands ◽  
S.V. Belyakov
Keyword(s):  
Spectral Data ◽  
X Ray ◽  
Methylene Groups ◽  
Active Methylene

scholarly journals Hydrodynamic Models of Solar and Stellar Flares

1989 ◽  
Vol 104 (1) ◽  
pp. 289-298
Author(s):  
Giovanni Peres
Keyword(s):  
High Resolution ◽  
Light Curve ◽  
Solar Flares ◽  
Impulsive Phase ◽  
Light Curves ◽  
Physical Parameters ◽  
The Sun ◽  
Hydrodynamic Models ◽  
X Ray ◽  
Stellar Flares

AbstractThis paper discusses the hydrodynamic modeling of flaring plasma confined in magnetic loops and its objectives within the broader scope of flare physics. In particular, the Palermo-Harvard model is discussed along with its applications to the detailed fitting of X-ray light curves of solar flares and to the simulation of high-resolution Caxix spectra in the impulsive phase. These two approaches provide complementary constraints on the relevant features of solar flares. The extension to the stellar case, with the fitting of the light curve of an X-ray flare which occurred on Proxima Centauri, demonstrates the feasibility of using this kind of model for stars too. Although the stellar observations do not provide the wealth of details available for the Sun, and, therefore, constrain the model more loosely, there are strong motivations to pursue this line of research: the wider range of physical parameters in stellar flares and the possibility of studying further the solar-stellar connection.

Analysis of X-ray spectral data with genetic algorithms

2002 ◽  
Vol 75 (5) ◽  
pp. 625-636 ◽  
Author(s):  
I.E Golovkin ◽  
R.C Mancini ◽  
S.J Louis ◽  
R.W Lee ◽  
L Klein
Keyword(s):  
Genetic Algorithms ◽  
Spectral Data ◽  
X Ray

Equations of Hydrodynamics, Heat, and Mass Transfer in Models of Regional and Mesoscale Atmospheric Processes

2017 ◽  
pp. 169-197
Keyword(s):  
Mass Transfer ◽  
Mathematical Models ◽  
Heat And Mass Transfer ◽  
Hydrodynamic Model ◽  
Specific Area ◽  
Hydrodynamic Models ◽  
Atmospheric Processes

The formation of meteorological processes and phenomena in the atmosphere in each specific area is influenced by the processes of different scales. However, the significance of each process in different cases is different. Therefore, there are certain priorities for the inclusion of certain processes in the hydrodynamic model. Depending on the size of the territory taken for modeling of processes or individual phenomena in the atmosphere, hydrodynamic models are divided into local and regional. In this chapter, we consider these features in terms of mathematical models.

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