X ray Region of the electromagnetic spectrum corresponding to radiation of high frequency and short wavelengths, far outside the visible spectrum.
X Ray - The part of the electromagnetic spectrum with wavelengths longer than gamma rays but shorter than ultraviolet ...
X Ray Astrophysics Facility (NASA Thesaurus) Free-flying x ray observatory that is shuttle-launched, maintainable in orbit, and retrievable. Used for Advanced X Ray Astrophysics Facility and AXAF.
X ray
gamma-ray astronomy
Related articles from newspapers, magazines, and more ...
ALEXIS [Array of Low Energy X-ray Imaging Sensors] was launched in 1993; a minisatellite containing six coffee-can-sized wide-angle, ultrasoft-X-ray telescopes, it provided the data for a unique sky map for studying celestial flashes of soft X rays.
For example, molecular oxygen (O2), ozone (O3), and molecular nitrogen (N2) in the Earth's atmosphere are almost perfectly transparent to infrared rays of all frequencies, but they strongly absorb ultraviolet light, X rays, and gamma rays.
Doppler shifts in its spectrum show that a companion object of 10 to 15 solar masses must be in orbit around it; evidence exists that the X rays originate near the companion.
The X rays are coming from an accretion disk which is formed when the gas goes into orbit around that compact object. If the gas falls down toward the black hole it gains speed (and hence energy) from falling in a gravitational field.
The greater the gravitational force and the denser the gas, the brighter the X rays. The X rays from MCG-6-30-15, however, are too bright to be explained merely by the effect of gravitational force, Reynolds said.
Intermediate-mass black holes have been proposed as a possible power source for ultra-luminous X ray sources.
Stellar-mass black holes have masses ranging from about 1.5-3.0 solar masses (the Tolman-Oppenheimer-Volkoff limit) to 15 solar masses.
X rays tend to penetrate material, not to be reflected, except when they arrive at a very shallow angle. That was achieved by a nest of curved conical mirrors stacked one inside the other. Radio telescopes were another innovation.
RHESSI - RHESSI is designed to image solar flares in energetic photons from soft X rays (~3 keV) to gamma rays (up to ~20 MeV) and to provide high resolution spectroscopy up to gamma-ray energies of ~20 MeV.
radiation with higher energy than visible light, but without as much energy as x rays
ultraviolet radiation
radiation with higher energy than visible light, but without as much energy as x rays ...
Data Visualization During Polar Rain
Data visualization of the X ray emissions over the North Pole during the "polar rain" of electrons on May 11, 1999. The emissions were detected by the PIXIE instrument on NASA's Polar spacecraft. (Courtesy NASA) ...
A sporadic source of intense X rays, probably consisting of a neutron star onto which new matter falls at irregular intervals.
carbon-14 (14C) - (n.) ...
active galaxy: A galaxy that is a source of excess radiation, usually radio waves, X rays, gamma rays, or some combination.
active optics: Optical elements whose position or shape is continuously controlled by computers.
[13.4] RADIO, INFRARED, ULTRAVIOLET, & X RAY TELESCOPES
[13.5] FOOTNOTE: STEREO IMAGING SCHEMES
[13.6] ENVOI: LIGHT & A NEW PHYSICS ...
There are three major types of galaxies: spiral (with arms), elliptical (no arm), and irregular (without rotational symmetry). Galaxies radiate a continuous spectrum of energy. Some radiate radio waves, X rays, and infrared, ...
Ultraviolet: Invisible part of the light spectrum where wavelengths are shorter than the visible spectrum and longer than X rays.
Unconsolidated: Materials loosely packed and not cemented together.
electromagnetic radiation - Radiation consisting of waves propagated through the building up and breaking down of electric and magnetic fields; these include radio, infrared, light, ultraviolet, X rays, and gamma rays.
Flare star
A flare star is a variable star which can undergo unpredictable dramatic increases in brightness for a few minutes or a few hours. The brightness increase is across the spectrum, from X rays to radio waves.
electromagnetic spectrum The entire range of electromagnetic waves, named in order of increasing frequency or energy, ranges from radio waves, to microwave, to infrared, to visible or optical, to ultraviolet, to X rays, to gamma rays. [More Info] ...
It is usually given the symbol γ (gamma) although in high energy physics this refers to high energy photons (photons of the immediately lower energy branch for instance are noted X and called X rays).
Depending on the wavelength, an electromagnetic wave can be a radio wave, a microwave, an infrared wave, a wave of visible light, an ultraviolet wave, a beam of X rays, or a beam of gamma rays. (see Photon) [G97]
Electromagnetism ...
X-ray source- a region of extremely hot gas; matter torn away from a normal star by a black hole or a neutron star becomes violently heated and emits x rays ...
 See also: Rays, Light, Energy, Earth, Orbit
  
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