x-ray background


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x-ray background

[′eks ‚rā ′bak‚grau̇nd]
(astronomy)
Diffuse, almost isotropic x-radiation from beyond the solar system, believed to be the summed contribution of many unresolved sources.
References in periodicals archive ?
The X-ray background noise's rate [[lambda].sub.b] is 0.005 photons/s/[cm.sup.2].
"Before NuSTAR, the X-ray background in high energies was just one blur with no resolved sources," lead author Fiona Harrison, the principal investigator of NuSTAR at Caltech in Pasadena, said in a (https://www.nasa.gov/feature/jpl/chorus-of-black-holes-sings-in-x-rays) statement .
The solar X-ray background (XRBG) flux values were taken from tables of daily values published online in the Solar Geophysical Data Comprehensive Reports, found at <ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SGD_PDFversion/> for the interval 1985-2008 and from <http://www.solen.info/solar/old_reports/> for the interval 2008-2015.
where [[lambda].sub.b] is the X-ray background noise's rate which is almost time-invariant in the cosmos environment, [[lambda].sub.s] is the X-ray pulsar signal's flux, h([theta](t)) is the X-ray pulsar signal's normalization standard profile, and [theta](t) is the X-ray pulsar signal's phase.
(1995) ASCA observations of the spectrum of the X-ray background. Publ.
Prof Alexander, pictured, said: "The X-ray background is made up of X-rays that reach the Earth from all directions within the cosmos.
Galeazzi's team found that the X-ray emission created by the solar wind would only account for about 40% of the X-ray background. This confirms the existence of a local hot bubble in interstellar space that produces the bulk of the X-ray background, although the result suggests that the bubble's hot gas is slightly less dense than scientists earlier estimated, the team concludes July 27th in Nature.
The result, paralleling the Spitzer studies, was a faint, diffuse X-ray glow that constitutes the cosmic X-ray background (CXB).
In addition to minimizing X-ray background and improving durability, the design of the new MicroMounts[TM] addresses other challenges currently facing crystallographers.
The team found a tight correlation between the X-ray background as mapped in 10 years of RXTE data and our galaxy's near-infrared glow as mapped by NASA's Cosmic Background Explorer (COBE) in the early 1990s.
For 37 years, astronomers have struggled to find the multitude of pointlike sources that combine to produce this impressionistic glow, known as the X-ray background. Although they have made progress, the limited ability of telescopes to detect X rays in fine detail has hampered their efforts.
By staring for one million seconds (11.6 days) at one patch of sky, Chandra has cracked one of cosmology's greatest mysteries: the source of the X-ray background first seen in Giacconi's 1962 experiment.