On the X-ray Emission Properties of Rotation Powered Pulsars

1998 ◽  
pp. 525-537 ◽  
Author(s):  
W. Becker ◽  
J. Trümper
Keyword(s):  
X Ray ◽  
Emission Properties

scholarly journals X-ray Emission Characteristics of Pulsars

2000 ◽  
Vol 195 ◽  
pp. 49-60
Author(s):  
W. Becker
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Emission Characteristics ◽  
Millisecond Pulsars ◽  
X Ray ◽  
Emission Properties ◽  
Important Progress

Recent X-ray observatories such as ROSAT, ASCA, RXTE, BeppoSAX, and Chandra have achieved important progress in neutron star and pulsar astronomy. The identification of Geminga as a rotation-powered pulsar, the discovery of X-ray emission from millisecond pulsars, and the identification of cooling neutron stars are only a few of the fascinating results. In the following, I will give a brief review on the X-ray emission properties of rotation-powered pulsars and their wind nebulae.

scholarly journals BURST AND PERSISTENT EMISSION PROPERTIES DURING THE RECENT ACTIVE EPISODE OF THE ANOMALOUS X-RAY PULSAR 1E 1841–045

2011 ◽  
Vol 740 (1) ◽  
pp. L16 ◽  
Author(s):  
Lin Lin ◽  
Chryssa Kouveliotou ◽  
Ersin Göğüş ◽  
Alexander J. van der Horst ◽  
Anna L. Watts ◽  
...  
Keyword(s):  
X Ray ◽  
Emission Properties

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).

Syntheses, X-ray crystal structures, and emission properties of diprotonated tetrapyridylpyrazine and triprotonated terpyridine

2015 ◽  
Vol 29 (6) ◽  
pp. 269-275 ◽  
Author(s):  
Naokazu Yoshikawa ◽  
Shinichi Yamabe ◽  
Nobuko Kanehisa ◽  
Tsuyoshi Inoue ◽  
Hiroshi Takashima
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Emission Properties

scholarly journals Formation of 8-RS-BODIPYs via direct substitution of 8-MeS-BODIPY by RSH (R = Et, Pr, Bu, tBu, n-C12H25, C6H5, p-MeC6H4, p-MeOC6H4, and 2,6-Me2C6H3)

2016 ◽  
Vol 94 (3) ◽  
pp. 234-239 ◽  
Author(s):  
Robinson I. Roacho ◽  
Alejandro Metta-Magaña ◽  
José L. Belmonte-Vázquez ◽  
Eduardo Peña-Cabrera ◽  
Keith H. Pannell
Keyword(s):  
Single Crystal ◽  
Fluorescence Intensity ◽  
Good Yield ◽  
Solvent Polarity ◽  
Aryl Group ◽  
Synthetic Pathway ◽  
X Ray ◽  
Emission Properties ◽  
Alkyl Derivatives ◽  
Direct Substitution

Reactions between 8-RS-BODIPY (R = Me, 1) and alkyl and aryl thiols were readily accomplished in dichloromethane to provide a synthetic pathway to a range of new 8-organothio-BODIPYs in good yield. The new alkyl 8-RS-BODIPYs (R = Et, 2; Pr, 3; Bu, 4; tBu, 5; n-dodecyl, 6) exhibit absorption and emission properties essentially unchanged from those of 1 whereas the arylthio analogs (R = Ph, 7; 2,6-Me2C6H3, 8; p-MeC6H4, 9; p-MeOC6H4, 10) exhibit no fluorescence with the exception of 7, and then only in hexane. In common with other related 8-substituted BODIPYs, the new 8-alkylthio-BODIPY dyes show decreasing fluorescence intensity as solvent polarity increases. Compounds 2, 3, 7, and 8 were characterized via single-crystal X-ray analysis; the alkyl derivatives 2 and 3 exhibited planar BODIPY cores with co-planar organothio- substituents whereas the aryl derivatives exhibited both BODIPY core deformation and significant twisting about the S–C (8) bond removing co-planarity between the aryl group and the distorted BODIPY core. These deformations coincide with the significantly reduced emission properties.

Syntheses, X-ray crystal structures, and emission properties of protonated tripyridyltriazines and their ruthenium(II) complexes

2017 ◽  
Vol 31 (3) ◽  
pp. e3777 ◽  
Author(s):  
Naokazu Yoshikawa ◽  
Shoko Yamazaki ◽  
Hiroko Kimura ◽  
Nobuko Kanehisa ◽  
Tsuyoshi Inoue ◽  
...  
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Emission Properties

X-ray emission properties from Circinus X-1

2007 ◽  
Vol 26 (4-5) ◽  
pp. 235-239
Author(s):  
V. V. Fidelis
Keyword(s):  
X Ray ◽  
Emission Properties

Effect of Annealing and Microwave Hydrogen Plasma Treatment on Structural, Chemical, and Electronic Properties of Ion Irradiated Diamond Films

2000 ◽  
Vol 650 ◽  
Author(s):  
Alexander Laikhtman ◽  
Alon Hoffman
Keyword(s):  
Plasma Treatment ◽  
Electron Affinity ◽  
Electron Emission ◽  
Hydrogen Plasma ◽  
Diamond Films ◽  
Ion Bombardment ◽  
Near Surface ◽  
Diamond Surfaces ◽  
X Ray ◽  
Emission Properties

ABSTRACTIn the present study we correlate between the secondary electron emission (SEE) of variously treated Xe+ ion-damaged diamond films and their bonding structure in the near-surface region as identified by near edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray photoelectron spectroscopy. The 50 keV Xe+ ion bombardment of hydrogenated polycrystalline diamond films to a dose of 2×1015 cm−2 results in the transformation of near-surface diamond to sp2-bonded amorphous carbon, increased oxygen adsorption, shift of the electron affinity from negative to positive, and strong degradation of its electron emission properties, although it does not induce a pronounced depletion of hydrogen. Exposure of the ion-bombarded films to microwave (MW) hydrogen plasma treatment for 30 min produces negative electron affinity diamond surfaces, but only partially regenerates SEE properties, retains some imperfection in the near-surface atomic layers, as determined by NEXAFS, and the concentration of oxygen remains relatively high. Subsequent annealing to 610 °C produces oxygen-free diamond films and somewhat increases their SEE. Annealing to 1000 °C results in desorption of the surface hydrogen, formation of a positive electron affinity surfaces and drastically degrades their electron emission properties. Prolonged, up to three hours MW hydrogen plasma treatment of as-implanted diamond films gradually improves the crystal quality and results in further increase of SEE intensity. This treatment does not, however, substantially reduce the concentration of oxygen in the previously damaged diamond, indicating its bulk diffusion during or after ion bombardment. To fully recover electron emission properties it is necessary to both remove the defects and hydrogenate the diamond surfaces.

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