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Aspects of the cosmic microwave background dipole

Kamionkowski, Marc and Knox, Lloyd (2003) Aspects of the cosmic microwave background dipole. Physical Review D, 67 (6). Art. No. 063001. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:KAMprd03

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Abstract

Cosmic microwave background (CMB) experiments generally infer a temperature fluctuation from a measured intensity fluctuation through the first term in the Taylor expansion of the Planck function, the relation between the intensity in a given frequency and the temperature. However, with the forthcoming Planck satellite, and perhaps even with the Microwave Anisotropy Probe, the CMB-dipole amplitude will be large enough to warrant inclusion of the next higher order term. To quadratic order in the dipole amplitude, there is an intensity quadrupole induced by the dipole with a frequency dependence given by the second derivative of the Planck function. The Planck satellite should be able to detect this dipole-induced intensity quadrupole and distinguish it through its frequency dependence from the intrinsic CMB temperature and foreground quadrupoles. This higher-order effect provides a robust pre-determined target that may provide tests of Planck's and MAP's large-angle-fluctuation measurements and of their techniques for multifrequency foreground subtraction.


Item Type:Article
Additional Information:©2003 The American Physical Society (Received 1 November 2002; published 17 March 2003) We thank the Santa Barbara KITP for hospitality. This work was supported at Caltech by NSF AST-0096023, NASA NAG5-9821, and DOE DE-FG03-92-ER40701, at Davis by NASA NAG5-11098, and at the KITP by NSF PHY99-07949.
Subject Keywords:radiofrequency cosmic radiation
Record Number:CaltechAUTHORS:KAMprd03
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KAMprd03
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.67.063001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3477
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:08 Jun 2006
Last Modified:26 Dec 2012 08:54

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