On the RMS Anisotropy at $7\deg$ and $10\deg$ Observed in the COBE-DMR Two Year Sky Maps
**Previous
abstract** **Next
abstract**

**Session 57 -- COBE and Related Papers**
*Display presentation, Tuesday, 10, 1995, 9:20am - 6:30pm*

## [57.01] On the RMS Anisotropy at $7\deg$ and $10\deg$ Observed in the COBE-DMR Two Year Sky Maps

*A.J. Banday, K.M. Gorski (HSTX), L. Tenorio, G.F. Smoot, C.H. Lineweaver (UC Berkeley), A. Kogut, G. Hinshaw (HSTX), C.L. Bennett (GSFC)*
The frequency-independent RMS temperature fluctuations determined from
the *COBE*
DMR two year sky maps are used to infer the
normalization, $Q_{rms-PS}$, for models of primordial cosmological
temperature anisotropy. A \lq cross'-RMS statistic is used to
determine $Q_{rms-PS}$ for a forced fit to a scale-invariant
Harrison-Zel'dovich ($n$ = 1) spectral model. The joint analysis of
$7\deg$ and $10\deg$ RMS temperature anisotropy derived from the 53
and 90 GHz sky maps yields $Q_{rms-PS}$ = 17.0$^{+2.5}_{-2.1}$ $\mu$K
when the low quadrupole is included, and $Q_{rms-PS}$ =
19.4$^{+2.3}_{-2.1}$ $\mu$K excluding the quadrupole. The effect of
the low quadrupole derived from the *COBE*
DMR data on the
inferred $Q_{rms-PS}$ normalization is investigated. A bias to lower
$Q_{rms-PS}$ is found when the quadrupole is included. The higher
normalization for a forced $n$ = 1 fit is then favored by the
cross-RMS technique. The $Q_{rms-PS}$ normalization derived for other
cosmological models (CDM *etc.*
) is reported.

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.

**Tuesday
program listing**