The Spectral Index of Large Scale Anisotropies in the Cosmic Microwave Background Radiation
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**Session 20 -- Cosmic X-Ray and Microwave Background**
*Oral presentation, Monday, 30, 1994, 2:00-3:30*

## [20.03] The Spectral Index of Large Scale Anisotropies in the Cosmic Microwave Background Radiation

*K.Ganga, L.Page (Princeton), E.Cheng (NASA/GSFC), S.Meyer (Chicago)*

The large angular scale anisotropy of the cosmic microwave
background can often be parameterized by a spectral index, $n$,
and a quadrupolar amplitude, $Q$. Applying a new statistical
measure to data from the Far Infra-Red Survey (FIRS), we form a
contour plot of the likelihood for cosmological models with $-1 <
n < 3$ and $0 \le Q \le 50~\mu{\rm K}$. We find that the
likelihood is maximum at $(n, Q) = (1.0,19\mu\mbox{K})$. For $n =
1$ the likelihood falls to half its maximum at $Q \approx
14\mu\mbox{K}$ and $25\mu\mbox{K}$ and for $Q = 19\mu$K the
likelihood falls to half its maximum at $n \approx 0.5$ and
$1.4$.

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