Einstein Observatory


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Einstein Observatory:

see X-ray astronomyX-ray astronomy,
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.
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Einstein Observatory

NASA's second High-Energy Astrophysical Observatory, HEAO-2, launched in Nov. 1978 for X-ray observations and operated until loss of control gas in Apr. 1981. The (then) unique capabilities of its 60-cm grazing incidence telescope revolutionized X-ray astronomy, in the same way Uhuru had done a decade before. High-resolution maps were obtained of many extended sources (clusters of galaxies, supernova remnants), the first high-resolution spectroscopy was achieved on a few bright sources, and the enhanced sensitivity led to the discovery of several thousand faint sources (down to ˜10 nanojansky), mainly identified with normal galactic stars or active galaxies (quasars) at high redshifts. A catalog of Einstein Observatory sources is available as an extension to the EXOSAT Database.
References in periodicals archive ?
Scanning the heavens in great circles that pass through the north and south ecliptic poles, the German-built X-ray telescope imaged much fainter objects and achieved an angular resolution three times greater than the orbiting Einstein Observatory, which conducted a smaller X-ray imaging survey in 1979.
The Vela supernova remnant has puzzled astronomers ever since the Einstein Observatory detected its X-ray emissions.
Only 38 of these sources -- eight of them globular clusters -- appeared in observations by the orbiting Einstein Observatory in 1979 (image on right), note Francis A.
Identified as an ordinary X-ray source more than a decade ago by the orbiting Einstein Observatory, this Milky Way resident recently began drawing special attention.
Using observations of the Imaging Proportional Counter on the Einstein Observatory satellite, they found first that the intensity of X-ray halos represents an amount of dust consistent with what astrophysicists had calculated from the observed absorption of visible light.

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