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A search for the dipole anisotropy of the Cosmic x ray backgroundX ray data was analyzed which was obtained by the HEAO-1 A2 satellite in order to look for large scale structure in the Cosmic X ray Background. The dipole moment of the x ray background is deltaI/I = (1.87 + or - .34)x 10(exp -2) in a direction, declination = 3.6 + or - 9.4 deg and right ascension = 15.9 + or - .2 hr. This implies a velocity of the Earth with respect to the background of 409.2 + or - 74.4 km/s in the same direction. Comparatively, measurements of the dipole anisotropy of the Cosmic Microwave Background imply a velocity of 369.2 + or - 4 km/s in a direction, declination = 6 + or - 1 deg and right ascension = 11.2 + or - .1 hr. Quoted errors are statistical only. The disparity between the velocities of the x ray dipole and microwave dipole may be due to residual structure in the x ray sky or as yet undiscovered systematic errors.
Document ID
19920016261
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Evans, Tom
(Haverford Coll. PA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1992
Subject Category
Space Radiation
Report/Patent Number
NAS 1.26:190289
NASA-CR-190289
Accession Number
92N25504
Funding Number(s)
CONTRACT_GRANT: NAG5-1713
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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