MSAM1-94: Repeated Measurement of Medium-Scale Anistropy in the Cosmic Microwave Background Radiation
Abstract
The second flight of the Medium-Scale Anisotropy Measurement (MSAM1-94) observed the same field as the first flight (MSAM1-92) to confirm our earlier measurement of cosmic microwave background radiation (CMBR) anisotropy. This instrument chops a 30' beam in a three-position pattern with a throw of +/-40' and simultaneously measures single- and double-differenced sky signals. We observe in four spectral channels centered at 5.6, 9.0, 16.5, and 22.5 cm-1, providing sensitivity to the peak of the CMBR and to thermal emission from interstellar dust. The dust component correlates well with the IRAS 100 mu m map. The CMBR observations in our double-difference channel correlate well with the earlier observations, but the single-difference channel shows some discrepancies. We obtain a detection of fluctuations in the MSAM1-94 data set that match CMBR in our spectral bands of Delta T/T = 1.9^{+1.3}_{-0.7} x 10^{-5} (90% confidence interval, including calibration uncertainty) for total rms Gaussian fluctuations with correlation angle 0.dg3, using the double-difference demodulation.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1996
- DOI:
- 10.1086/309870
- arXiv:
- arXiv:astro-ph/9508087
- Bibcode:
- 1996ApJ...456L..71C
- Keywords:
-
- BALLOONS;
- COSMOLOGY: COSMIC MICROWAVE BACKGROUND;
- COSMOLOGY: OBSERVATIONS;
- Astrophysics
- E-Print:
- 11 pages, 4 postscript figures, uses aastex 4.0. Transmitted in uuencoded gzipped tar file