Results 41 to 50 of about 7,225,990 (222)
Narrow-band X-ray polarizing filters.
, 2007 We review past and current attempts to measure X-ray polarization in celestial sources and describe research activity into a new family of materials which have been shown to exhibit linear dichroism at X-ray wavelengths.
N. P. Bannister (7590155) +8 more
core +6 more sources
Discovery of a New Flaring Class in GRS 1915+105 Using AstroSat
The Astrophysical JournalThe highly variable black hole X-ray binary GRS 1915+105 has shown many flaring classes when the source oscillates between the high soft state (HS) and the hard intermediate state with a transition time of less than 10 s. The X-ray flux is anticorrelated
Ruchika Dhaka +3 more
doaj +1 more source
DISTINGUISHING BETWEEN SPOT AND TORUS MODELS OF HIGH-FREQUENCY QUASIPERIODIC OSCILLATIONS
Acta Polytechnica, 2014 In the context of high-frequency quasi-periodic oscillation (HF QPOs) we further explore the appearance of an observable signal generated by hot spots moving along quasi-elliptic trajectories close to the innermost stable circular orbit in the ...
Vladimír Karas +10 more
doaj +1 more source
The High-energy Spectrum of the Young Planet Host V1298 Tau
The Astronomical Journal, 2023 V1298 Tau is a young pre-main-sequence star hosting four known exoplanets that are prime targets for transmission spectroscopy with current-generation instruments. This work pieces together observations from the NICER X-ray telescope, the Space Telescope
Girish M. Duvvuri +6 more
doaj +1 more source
INFRARED COUNTERPARTS OF X-RAY GALAXIES
Odessa Astronomical Publications, 2019 Population studies of the extragalac- tic objects are a major part of the universe large-scale structure study. Apart from radio, infrared, and visible wavelength bands, observations and further identification of extragalactic objects such as galaxies ...
A. V. Tugay, S. Yu. Shevchenko
doaj +1 more source
Spectral Energy Distributions of Southern Binary X-Ray Sources
The Astrophysical Journal Supplement Series, 2023 The rapid variability of X-ray binaries (XRBs) produces a wide range of X-ray states that are linked to activity across the electromagnetic spectrum. It is particularly challenging to study a sample of sources large enough to include all types in their ...
John M. Dickey +7 more
doaj +1 more source
Chinese Lending and Sovereign Debt Distress in Developing Countries
Economics &Politics, EarlyView.ABSTRACT China has emerged as the world's largest bilateral creditor to developing countries, yet its effects on sovereign debt outcomes remain contested. Competing theoretical perspectives predict opposing effects: Chinese lending may increase debt vulnerability through opacity, moral hazard, and unsustainable obligations, or reduce it by providing ...
Patrick E. Shea
wiley +1 more source
An Overview of the Performance of the Chandra X-ray Observatory
Experimental Astronomy, 2003 The Chandra X-ray Observatory is the X-ray component of NASA's Great Observatory Program which includes the recently launched Spitzer Infrared Telescope, the Hubble Space Telescope (HST) for observations in the visible, and the Compton Gamma-Ray Observatory (CGRO) which, after providing years of useful data has reentered the atmosphere.
Weisskopf, M. C. +8 more
openaire +2 more sources
Cyclone Hard X-Ray Observatory [PDF]
SPIE Proceedings, 2000 In response to the recent NASA-SMEX Announcement of Opportunity, our collaboration proposed Cyclone, the Cyclotron/Nuclear Explorer. Cyclone is a broadband pointed astrophysical observatory, combining the highest spectral resolutions (E/(Delta) E approximately 30 - 300) and angular resolutions (15') achieved in the optimized hard X-ray range (10 - 200 ...
Boggs, Steven E. +11 more
openaire +2 more sources
Contributions of the "Great" X-Ray Observatories (XMM-Newton and Chandra) to Astronomy and Astrophysics [PDF]
, 2011 NASA s Chandra X-ray Observatory and ESA s XMM-Newton made their first observations over a decade ago. The unprecedented and complementary capabilities of these observatories to detect, image, and measure the energy of cosmic X-rays, achieved less than ...
Weisskopf, Martin
core