The amplitude and spectral index of the large angular scale anisotropy in the cosmic microwave background radiation

Ken Ganga, Lyman Page, Edward Cheng, Stephan Meyer

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

In many cosmological models, the large angular scale anisotropy in the cosmic microwave background is parameterized by a spectral index, n, and a quadrupolar amplitude, Q. For a Harrison-Peebles-Zel'dovich spectrum, n = 1. Using data from the Far Infrared Survey (FIRS) and a new statistical measure, a contour plot of the likelihood for cosmological models for which -1 < n < 3 and 0 ≤ Q ≤ 50 μK is obtained. Depending upon the details of the analysis, the maximum likelihood occurs at n between 0.8 and 1.4 and Q between 18 and 21 μK. Regardless of Q, the likelihood is always less than half its maximum for n < -0.4 and for n > 2.2, as it is for Q < 8 μK and Q > 44 μK.

Original languageEnglish (US)
Pages (from-to)L15-L18
JournalAstrophysical Journal
Volume432
Issue number1 PART 2
DOIs
StatePublished - Sep 1 1994

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmic microwave background

Fingerprint Dive into the research topics of 'The amplitude and spectral index of the large angular scale anisotropy in the cosmic microwave background radiation'. Together they form a unique fingerprint.

  • Cite this