Likelihood Analysis of Degree-Scale Anisotropy Experiments Compared with COBE
**Previous
abstract** **Next
abstract**

**Session 71 -- Galaxy and CBR Distribution**
*Display presentation, Friday, January 14, 9:30-6:45, Salons I/II Room (Crystal Gateway)*

## [71.15] Likelihood Analysis of Degree-Scale Anisotropy Experiments Compared with COBE

*E. L. Wright, M. Rubin (UCLA)*
Comparing the large angular scale $\Delta T$ observed by the {\sl COBE} DMR
experiment to the $\Delta T$ observed by balloon and ground-based
experiments at degree scales is one of the best ways to
test the inflationary scenario through its prediction of (almost)
equal power on all scales.
We have computed likelihood functions for the Schuster *et al.*
(1993)
South Pole (SP91) $\Delta T$ data on $1^\circ$ scales
given models based on the Holtzman (1989) calculations scaled
by a linear bias factor.
Our calculations explicitly include the sinusoidal chop and the linear
baseline removal used in this experiment.
While our results confirm
the result based on a simple analysis assuming that SP91 is a single
subtracted experiment with a 1.5$^\circ$ FWHM Gaussian beam and a 2.1$^\circ$
square-wave chop that the maximum likelihood for SP91 is given by a bias
factor roughly twice as large as the bias needed to match the COBE
large-scale $\Delta T$, we have used the joint likelihood of the
COBE $\Delta T$ at $\ell \approx 4$
(taken from Wright *et al.*
1994) and the SP91 data
at $\ell \approx 44$
to compute limits on the spectral index $n$ of the power spectrum of
primordial perturbations $P(k) \propto k^n$.
A similar analysis using the results of the MAX experiment
at $\ell \approx 110$ will also be given.

{The National Aeronautics and Space Administration/Goddard Space Flight
Center (NASA/GSFC) is responsible for the design, development, and
operation of the Cosmic Background Explorer (COBE).
Scientific guidance is provided by the COBE Science Working Group.
final GSFC is also responsible for the development of the analysis software
and for the production of the mission data sets.}

**Friday
program listing**