X-ray Astronomy
Related Category: Astronomy: General
study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X rays.
X-ray astronomy
X-ray astronomy is an observational branch of astronomy, which deals with the study of X-ray emission from celestial objects.
X-ray Binary
An X-ray binary is a close binary system where a neutron star (or more rarely a black hole) is accreting matter from what is usually a main sequence star.
X-ray astronomy
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X-ray
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X-ray outburst observed by school children
KEITH COOPER
ASTRONOMY NOW
Posted: 20 April 2011 ...
X-ray Astronomy
History of X-ray Astronomy
The study of astronomical objects at the highest energies of X-rays and gamma-rays really began only in the early 1960's. Before then, we knew only that the Sun was an intense source in these wavebands.
X-rays fit in the spectrum between ultra-violet radiation and gamma rays
So-called `soft' x-rays are in the lower energy (longer wavelength) part of this range, while hard x-rays are in the shorter wavelengths (and hence higher energies).
Definition: X-ray: Light that is so blue humans cannot see it. A band of the spectrum between the ultraviolet and the gamma-ray.
Characteristics of X-rays
Characteristics of Visible Star/Companion
Cygnus X-1 ...
X-ray binary
Wikipedia, the free encyclopedia - Cite This Source
X-ray binaries are a class of binary stars that are very luminous in X-rays.
Chandra X-ray Observatory
In July of 1999, the Space Shuttle Columbia was launched with its heaviest payload to that date.
Chandra X-ray Observatory
The Chandra Telescope is in orbit around Earth. Image Credit: NASA
a powerful X-ray telescope ...
anomalous X-ray pulsar (AXP)
A type of X-ray pulsar with a very long axial rotation period (for a pulsar), of 6 to 12 seconds, combined with a very powerful X-ray emission that cannot be explained by such a low spin rate.
X-RAY BURSTS - Bursts of X-ray energy that occur in low-mass X-ray binary systems in which a neutron star and low-mass main sequence star are in orbit around one another.
X-Ray selected BL Lac Object
XBONG
X-Ray Bright Optically Normal galaxy.
X-RAY SOURCES
The late 1970s saw several important discoveries about neutron stars in binary-star systems. Numerous X-ray sources were discovered near the central regions of our galaxy and also near the centers of a few rich star clusters.
X-ray burster X-ray source that radiates thousands of times more energy than our Sun, in short bursts that last only a few seconds.
X-ray Astronomy High-Energy Universe Advanced X-Ray Astrophysics Facility Science Center
Supernovas Goddard Space Flight Center Laboratory for High Energy Astrophysics ...
X-ray variability is known in both intensity and spectral shape. There is evidence of changes in the soft X-ray cutoff produced by H photoelectric absorption (Barr et al 1977 MNRAS 181, 438), ...
X-ray Burst. A temporary enhancement of the X-ray emission of the Sun. The time-intensity profile of soft X-ray bursts is similar to that of the H-alpha profile of an associated flare.
X-ray crystallography is a method of determining the arrangement of atoms within a crystal, in which a beam of X-rays strikes a crystal and scatters into many different directions....
of G-actin was solved in 1990 by Kabsch and colleagues.
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 ...
X-rays--electromagnetic waves of short wavelength, capable of penetrating some thickness of matter.
X-ray -- Electromagnetic radiation in the neighborhood of 100 picometer wavelength.
Y -- Yotta, a multiplier, x1024 from the second-to-last letter of the Latin alphabet. See the entry for CGPM.
X-ray
Electromagnetic radiation of very short wavelength and very high-energy; X-rays have shorter wavelengths than ultraviolet light but longer wavelengths than cosmic rays.
XRONOS
Temporal analysis program in XANADU ...
X-rays. Electromagnetic radiation with a wavelength shorter than ultraviolet light but longer than gamma rays.
Y ...
X-ray burster: An object that produces occasional X-ray flares; believed to be caused by mass transfer in a close binary star system.
X-ray burst - Sporadic burst of X rays originating in the rapid consumption of nuclear fuels on the surface of the neutron star in a binary system
X-ray pulsar - A neutron star from which periodic bursts of X rays are observed ...
X-RAY BINARY STAR
X-ray binary stars are a special type of binary star in which one of the stars is a collapsed object such as a white dwarf, neutron star, or black hole.
X-ray emission from northern aurora observed by the Polar Satellite (Ref) ...
X-ray: Light that is so blue humans cannot see it. A band of the spectrum between the ultraviolet and the gamma-ray. Photons of X-ray light are more energetic than photons in the ultraviolet but less energetic than photons in the gamma-ray.
The X-Ray Corona
Click on image for larger version.
The corona shines brightly in x-rays because of its high temperature. On the other hand, the "cool" solar photosphere emits very few x-rays.
Chandra X-ray Telescope
The most sophisticated X-ray observatory ever built, it was launched and deployed into Earth orbit by the Space Shuttle in 1999.
...
X-RAYS
X-rays are a type of electromagnetic radiation (between ultraviolet light and gamma rays in wavelength, frequency, and energy) - basically, it's light that is way past the blue-violet end of the visible spectrum - we cannot see it.
X-rays were discovered being emitted by a crescent-shaped part of the sunward-facing coma of Comet Hyakutake, 20,000 km away from the nucleus.
X-rays have a smaller wavelength than radio waves; therefore, they have a greater frequency. This is what the frequencies on your radio dial mean. If you could somehow tune your radio receiver to 1 trillion megahertz, you could pick up x-rays.
X-Rays are also represented in the Great Observatories, with the Chandra X-ray Observatory, renamed (from AXAF) in honor of the great Indian astrophysicist Chandrasekhar.
X-ray emission from stellar coronal material has been observed around Stars B and C with the Chandra X-Ray Observatory (press release; Brickhouse et al, 2001; and Nikolic et al, 1997; among others).
X-ray doubles
This site is linked to Spectra and The Hertzsprung-Russell (HR) Diagram.
X-ray Eyes on Tempel
This false-color image shows comet Tempel 1 as seen by Chandra X-ray Observatory on June 30, 2005, Universal Time. The comet was bright and condensed.
X-ray studies have shown that there is very hot gas between the galaxies in a cluster but this gas does not solve one of the great puzzles in astronomy which is that these clusters require a certain total mass to explain how they are held together ...
X-Rays
Electromagnetic radiation with very short wavelengths and very high energies and frequencies. X-rays fall between gamma rays and ultraviolet radiation; also called X-radiation or Roentgen ray.
X-rays: Electromagnetic waves with a wavelength between those of ultraviolet and of gamma rays.
Z
Zond: Series of lunar probes.
X-ray - (n.)
A photon of electromagnetic radiation in the wavelength interval between about 1 Angstrom and 100 Angstroms.
year - (n.) ...
X-ray wavelengths are often given ångström stars (Å*). This unit was devised by J. A. Bearden[21] in 1965 and is based on the wavelength of the K1 line of tungsten which he took to be 0.2090100 Å*, where Å* = 1.00001481 Å = 1.
X-ray Burster: A semidetached binary system where matter is accreting onto a neutron star. As hydrogen accretes onto a neutron star (possibly producing a variable X-ray source) the hydrogen is promptly burned into helium.
An X-Ray image of a supernova remnant and its central neutron star
Click on image for full size
ROSAT satellite image courtesy of NASA
Neutron Stars are the end point of a massive star's life.
The X-ray glow of million-degree gas fills the Coma Cluster of galaxies in this image from the ROSAT satellite. The gas is thicker at the center of the cluster. Some of the galaxies are visible as small red or orange points in the image.
The X-ray spectrum obtained with the Reflection Grating Spectrometer (RGS) of the space telescope XMM-Newton is the best obtained so far of such a system. It reveals unprecedented details of its gaseous environment.
Recent X-ray observations have confirmed that galactic halos contain hot gas, gas with temperatures of millions of degrees.
Certain X-rays sources that "flicker" rapidly for short intervals.
R
Radial Velocity ...
Chandra X-ray Observatory Images Of N49B, The Remains Of An Exploded Star Science Daily - April 2004
The Chandra image of N49B, the remains of an exploded star, shows a cloud of multimillion-degree gas that has been expanding for about 10,000 years.
A "Solar X-ray Imager (SXI)" to track solar activity.
A "Space Environment Monitor System (SEM)" to monitor "space weather".
A COSPAS-SARSAT search and rescue transponder.
Photograph of X-Rays
coming from the Sun
Photograph taken during eclipse
showing solar corona ...
A space-based X-ray observatory built and operated by the Italian Space Agency and the Netherlands Agency for Aerospace Programs. BeppoSAX has been instrumental in identifying and locating gamma-ray bursts.
Big Bang ...
pair production An absorption process for X-ray and gamma ray radiation in which the incident photon is annihilated in the vicinity of the nucleus of the absorbing atom, with subsequent production of an electron and positron pair.
magnetars (NASA Thesaurus) Highly magnetized neutron stars believed to emit quasi-steady x-rays along with bursts of soft gamma rays-- emissions powered by their magnetic energy.
Light, radio waves, X-rays, infrared and ultraviolet rays are all kinds of electromagnetic radiation. This is what astronomers are usually talking about when they refer to ‘radiation'.
A sudden deviation in the sunlit geomagnetic field (H component; see GEOMAGNETIC ELEMENTS) associated with large solar FLARE X-ray emission. D REGION. A daytime layer of the earth's IONOSPHERE approximately 50 to 90 km in altitude.
 See also: Ray, Energy, Light, Earth, Rays
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