The Effect of Microlensing on the Observed X-Ray Energy Spectra of Gravitationally Lensed Quasars

Self-amplified spontaneous emission (SASE) enables X-ray free-electron lasers (XFELs) to generate hard X-ray pulses of sub-100 fs duration. However, due to the stochastic nature of SASE, the energy spectrum fluctuates from pulse to pulse. Many experiments that employ XFEL radiation require the resolution of the spectrum of each pulse. The work presented here investigates the capacity of a thin strongly bent diamond crystal to resolve the energy spectra of hard X-ray SASE pulses by studying its diffraction properties. Rocking curves of the symmetric C*(440) reflection have been measured for different bending radii. The experimental data match the theoretical modelling based on the Takagi–Taupin equations of dynamical diffraction. A uniform strain gradient has proven to be a valid model of strain deformations in the crystal.

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Monte Carlo simulations of different CT X-ray energy spectra within CTDI phantom and the influence of its changes on radiochromic film measurements

Physica Medica ◽

10.1016/j.ejmp.2019.04.015 ◽

2019 ◽

Vol 62 ◽

pp. 105-110 ◽

Cited By ~ 1

Author(s):

Nada Tomic ◽

Pavlos Papaconstadopoulos ◽

Hamed Bekerat ◽

Golub Antunovic ◽

Saad Aldelaijan ◽

...

Keyword(s):

Monte Carlo ◽

Monte Carlo Simulations ◽

Radiochromic Film ◽

Energy Spectra ◽

X Ray

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Identification of cobalt in processes of stained neurones using X-ray energy spectra in the electron microscope

Brain Research ◽

10.1016/0006-8993(75)91000-8 ◽

1975 ◽

Vol 85 (1) ◽

pp. 33-37 ◽

Cited By ~ 7

Author(s):

J.B. Kirkham ◽

L.J. Goodman ◽

R.L. Chappell

Keyword(s):

Electron Microscope ◽

Energy Spectra ◽

X Ray

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Energy spectra of 43 galactic X-ray sources observed by UHURU

The Astrophysical Journal ◽

10.1086/155315 ◽

1977 ◽

Vol 214 ◽

pp. 856 ◽

Cited By ~ 42

Author(s):

C. Jones

Keyword(s):

Energy Spectra ◽

X Ray

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Iron K Emission Lines in the Energy Spectra of Low‐Mass X‐Ray Binaries Observed with ASCA

The Astrophysical Journal Supplement Series ◽

10.1086/317374 ◽

2000 ◽

Vol 131 (2) ◽

pp. 571-591 ◽

Cited By ~ 72

Author(s):

K. Asai ◽

T. Dotani ◽

F. Nagase ◽

K. Mitsuda

Keyword(s):

Emission Lines ◽

Energy Spectra ◽

X Ray ◽

Low Mass ◽

X Ray Binaries

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New ASCA Observations of two Anomalous X-ray Pulsars

International Astronomical Union Colloquium ◽

10.1017/s0252921100061005 ◽

2000 ◽

Vol 177 ◽

pp. 695-698 ◽

Cited By ~ 1

Author(s):

B. Paul ◽

M. Kawasaki ◽

T. Dotani ◽

F. Nagase

Keyword(s):

Accretion Rate ◽

Accretion Disc ◽

Spectral Shape ◽

Energy Spectra ◽

Pulse Profile ◽

X Ray ◽

Low Mass ◽

Low X ◽

Star Surface ◽

Made In

AbstractNewASCAobservations of two anomalous X-ray pulsars (AXP) 4U 0142+61 and 1E 1048.1-5937, made in 1998, when compared to earlier observations in 1994 show remarkable stability in the intensity, spectral shape and pulse profile. The energy spectra consist of two components, a power-law and a blackbody emission from the neutron star surface. In IE 1048.1-5937, we have identified three epochs with different spin-down rates and discuss its implications for the magnetar hypothesis of the AXPs. We also note that the spin-down rate and its variations in IE 1048.1-5937 are much larger than what normally can be produced by an accretion disc with very low mass accretion rate corresponding to its low X-ray luminosity.

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The Sax Mission For X-Ray Astronomy

International Astronomical Union Colloquium ◽

10.1017/s0252921100076983 ◽

1990 ◽

Vol 123 ◽

pp. 141-150 ◽

Cited By ~ 1

Author(s):

R.C. Butler ◽

L. Scarsi

Keyword(s):

Energy Band ◽

Broad Band ◽

Energy Spectra ◽

X Ray ◽

Joint Development ◽

Space Agency ◽

Italian Space Agency ◽

Galactic Sources ◽

Bright Source

AbstractThe satellite for X-ray astronomy SAX, to be launched at the end of 1993, is devoted to systematic, integrated and comprehensive, studies of galactic and extra-galactic sources in the energy band 0.1–200 keV, and is under joint development by the Italian Space Agency (ASI) and the Netherlands Agency for Aerospace programs (NIVR), with the participation of SRU/SRON and SSD/ESTEC. The basic scientific objectives can be summarized as follows:– Broad band spectroscopy (E/Δ E=12) from 0.1–10 keV with imaging resolution of 1 arcmin.– Continuum and line spectroscopy (E/Δ E=5–20) in the energy range 3–200 keV.– Variability studies of bright source energy spectra on timescales from milliseconds to days and months.– Systematic long term variability studies over the entire sky down to a source intensity of 1 mCrab.

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