X-ray sources

X-ray sources

Luminous sources of X-ray emission lying well beyond the Solar System. More than 120 000 are now known, the majority from the ROSAT all-sky survey and deep pointing observations. Optical counterparts include a wide range of astronomical objects, from high-redshift quasars to nearby stars, and even comets. The brightest sources lie in our Galaxy and are identified principally as X-ray binaries (e.g. Scorpius X-1, Cygnus X-1, Cygnus X-3, Centaurus X-3, Hercules X-1), many having an X-ray power 100 to 1000 times the power of the Sun. A smaller subset of bright galactic X-ray sources are identified with young supernova remnants, such as the Crab nebula and the remnant of Tycho's star. Fainter but intrinsically much more powerful X-ray emission is detected from many extragalactic objects, especially rich clusters of galaxies and active galaxies – such as Seyfert galaxies, quasars, and powerful radio galaxies, including Virgo A (M87) and Centaurus A.
References in periodicals archive ?
Micro-X, a provider of cold-cathode x-ray technology has announced a multi-faceted collaboration with Thales to develop X-ray imaging systems based on X-ray sources that use Carbon NanoTubes (CNT) cathodes, the company said.
By doing so, NICER is able to track and target cosmic or X-ray sources as the ISS orbits Earth.
the following specification describes the requirements for an x-ray photoelectron spectrometer with 2 monochromatic x-ray sources. The x-ray photoelectron spectrometer is to be used for the characterization of layers and layer stacks, Superficially on pieces of silicon wafer.
Hailey and his team acknowledge that as many as half of their X-ray sources could be rotation-powered millisecond pulsars: fast-spinning neutrons stars that exhibit fewer outbursts.
In 1979, the first multiple-source CT system for dynamic objects was designed at the Mayo Clinic [9], consisting of a large number of X-ray sources and fluorescent screens.
Modern Diagnostic X-Ray Sources: Technology, Manufacturing, Reliability
Most of the X-ray sources are X-ray binaries (XRBs).
Nikon Metrology X-ray sources are at the heart of their X-ray and CT technology, and have been designed and manufactured in-house.
All compact X-ray sources are based on electron impact technology, which involves generating an electron beam by heating a cathode in a strong electric field.
The Einstein observatory was launched in November 1978, It provided high-resolution images and accurate locations for thousands of X-ray sources (Harris et al., 1993).
Users have a choice of X-ray sources, which includes a 3-kW sealed tube, MicroMax-002+ microfocus seal tube, and 1.2-kW MicroMax-007 HF microfocus rotating anode generator.
Many of the pointlike X-ray sources are small, stellar-mass black holes that feed off normal companion stars, Gregory sivakoff of the Ohio State University in Columbus and his colleagues reported last week in Austin, Texas, at a meeting of the American Astronomical Society.