ROSAT


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ROSAT

(roh -sat) Abbrev. for Röntgenstrahlen Satellit. A major German X-ray astronomy satellite, with UK and US collaboration, launched by a Delta II rocket into a 580 km, 53° inclination orbit in June 1990. The payload included a large (80-cm diameter) grazing incidence telescope to carry out the first deep all-sky survey in the 0.2–3 keV band. Use of such imaging optics over the first six months of the mission yielded an all-sky survey 100–1000 times deeper than those of Uhuru, Ariel V, and HEAO-1. The total number of cosmic X-ray sources detected, in this survey, some 60 000, was more than ten times the number previously recorded. A second ROSAT telescope, the Wide Field Camera (WFC), built by a consortium of UK university groups, uses grazing incidence optics at an unusually large angle and is optimized for the XUV band (0.2–0.02 keV). During the early ROSAT survey phase the WFC obtained the first all-sky survey in this energy band, detecting more than 1000 XUV sources, many being active stars or hot white dwarfs. Following the six-month survey phase, ROSAT embarked on a program of detailed observations of individual targets, chosen competitively from bids made by astronomers to the three ROSAT partners. The main spacecraft systems and three focal plane detectors (imaging proportional counter and microchannel plate arrays for the X-ray telescope plus XUV-sensitive MCP for the WFC) functioned until 1994. Thereafter observations continued with the microchannel plate array and the WFC. See also XUV astronomy.
References in periodicals archive ?
However, the ROSAT survey reveals significant differences in the distribution of these two types of stars.
A more panoramic X-ray view of the Cygnus Loop, taken by ROSAT and analyzed by Pisarski and Denis E Cioffi at NASA headquarters in Washington, D.C., also shows that X-ray emission is most intense behind the visible-light radiation.
Dentro de una vision de conjunto, seres del bien y del mal se disputaban las almas en la historia que se desplegaba en la Tierra, y los misioneros logicamente tenian parte activa en esta lucha contra los demonios (Rosat, 1995; Canizares-Esguerra, 2008; Cuevas, 2012).
Although this estimation might have error of another degree as the spectral range of ROSAT mission was 0.1-2 keV.
Kiziloglu, "ROSAT observations of PSR 0656 + 14--a pulsating and cooling neutron star," The Astrophysical Journal, vol.
Loredo, "Bayesian periodic signal detection: analysis of ROSAT observations of PSR 0540-693," The Astrophysical Journal, vol.
The image contains X-ray data gathered by NASA's Chandra X-ray Observatory and the ROSAT telescope, infrared data from NASA's Spitzer Space Telescope, and optical data from the SuperCosmos Sky Survey made using the United Kingdom Infrared Telescope.
A 1993 study using the ROSAT X-ray satellite observatory revealed this duo is embedded in an immense cloud of hot gas about 1 million light-years across and containing roughly 500 billion times the mass of the Sun.
Como fuentes de cotejo linguistico para la lengua quechua se emplearon los diccionarios de Santo Thomas (1560); Gonzalez de Holguin (2007 [1608]); Academia Mayor de la Lengua Quechua (2005) y Rosat (2009).
Their results directly show that the dominant populations of local AGNs are obscured ones, in contrast to the fact that most AGNs found in the ROSAT all-sky survey (26) at energies below 2 keV are unobscured.