Results 11 to 20 of about 187,880 (262)

The Soft X-ray Background [PDF]

Symposium - International Astronomical Union, 1973
A survey of soft X-ray background observations in the 0.1–10 keV range is presented. In the region above 1 keV, recent results on point X-ray sources are discussed and their integrated contribution to the diffuse background is estimated. However, the average luminosity of various classes of extragalactic X-ray sources is still not sufficiently well ...
H. Friedman, G. Fritz, S. D. Shulman, R. C. Henry   +3 more
openaire   +1 more source

THE HARD X-RAY PERSPECTIVE ON THE SOFT X-RAY EXCESS [PDF]

The Astrophysical Journal, 2014
The X-ray spectra of many active galactic nuclei (AGN) exhibit a `soft excess' below 1keV, whose physical origin remains unclear. Diverse models have been suggested to account for it, including ionised reflection of X-rays from the inner part of the accretion disc, ionised winds/absorbers, and Comptonisation.
Vasudevan, Ranjan V., Mushotzky, Richard F., Reynolds, Christopher S., Fabian, Andrew C., Lohfink, Anne M., Zoghbi, Abderahmen, Gallo, Luigi C., Walton, Dominic   +7 more
openaire   +3 more sources

Dimming of Continuum Captured in Mrk 841: New Clues on the Nature of the Soft X-Ray Excess

The Astrophysical Journal Letters, 2023
We report on a remarkable change in the spectral energy distribution (SED) of Mrk 841, providing new insights on how the soft X-ray excess emission in active galactic nuclei (AGNs) is produced.
Missagh Mehdipour, Gerard A. Kriss, Jelle S. Kaastra, Elisa Costantini, Junjie Mao   +4 more
doaj   +1 more source

Optimization of pump laser conditions for production of maximum gain of Ne-like Ge soft x-ray laser [PDF]

مجله علوم و فنون هسته‌ای, 2021
Laser produced plasma can be used as the sources of soft X-ray laser. The ability to control the laser quality and its gain coefficient by controlling laser and plasma’s parameters is one of the advantages of this method.
G. Ghani Moghadam, S. Rezaei, M. J. Jafari, A. H. Farahbod   +3 more
doaj   +1 more source

The PERCIVAL soft X-ray imager [PDF]

Journal of Instrumentation, 2014
With the increased brilliance of state-of-the-art Synchrotron radiation sources and the advent of Free Electron Lasers enabling revolutionary science with EUV to X-ray photons comes an urgent need for suitable photon imaging detectors. Requirements include high frame rates, very large dynamic range, single-photon counting capability with low ...
Wunderer, C., Marras, A., Bayer, M., Glaser, L., Göttlicher, P., Lange, S., Pithan, F., Scholz, F., Seltmann, J., Shevyakov, I., Smoljanin, S., Viefhaus, J., Viti, M., Xia, Q., Zimmer, M., Klumpp, S., Gasiorek, P., Guerrini, N., Marsh, B., Sedgwick, I., Turchetta, R., Cautero, G., Farina, S., Giuressi, D., Menk, R., Stebel, L., Yousef, H., Marchal, J., Nicholls, T., Tartoni, N., Graafsma, H.   +30 more
openaire   +4 more sources

NuSTAR Hard X-Ray Monitoring of Gravitationally Lensed Quasar RX J1131–1231

The Astrophysical Journal, 2023
The X-ray emission from active galactic nuclei is believed to come from a combination of inverse Compton scattering of photons from the accretion disk and reprocessing of the direct X-ray emission by reflection.
Cora A. DeFrancesco, Xinyu Dai, Mark Mitchell, Abderahmen Zoghbi, Christopher W. Morgan   +4 more
doaj   +1 more source

X-ray Chirped Pulse Amplification: towards GW Soft X-ray Lasers

Applied Sciences, 2013
Extensive modeling of the seeding of plasma-based soft X-ray lasers is reported in this article. Seminal experiments on amplification in plasmas created from solids have been studied in detail and explained.
Marta Fajardo, Pedro Velarde, Lu Li, David Ros, Stéphane Sebban, Eduardo Oliva, Thi Thu Thuy Le, Philippe Zeitoun   +7 more
doaj   +1 more source

Nanometer-Resolution Imaging of Living Cells Using Soft X-ray Contact Microscopy

Applied Sciences, 2022
Soft X-ray microscopy is a powerful technique for imaging cells with nanometer resolution in their native state without chemical fixation, staining, or sectioning.
Agata Nowak-Stępniowska, Wiktoria Kasprzycka, Paulina Natalia Osuchowska, Elżbieta Anna Trafny, Andrzej Bartnik, Henryk Fiedorowicz, Przemysław Wachulak   +6 more
doaj   +1 more source

On the soft emission mechanism in X-ray pulsars

Journal of Theoretical and Applied Physics, 2019
We propose a mechanism responsible for the soft emission in X-ray pulsars. We discuss the origin of the soft emission for isolated X-ray pulsars as well as for soft gamma-ray repeaters and anomalous X-ray pulsars.
Paolo Cea
doaj   +1 more source

Deciphering chiral structures in soft materials via resonant soft and tender X-ray scattering

Giant, 2020
Chirality is an essential research topic in material science, especially in soft materials including liquid crystals, polymers and biomaterials. There have been many discussions about chiral structures since people discovered and studied this particular ...
Yu Cao, Chenrun Feng, Antal Jakli, Chenhui Zhu, Feng Liu   +4 more
doaj   +1 more source