Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and Iota Draconis

A. C. Clapp, M. J. Devlin, J. O. Gundersen, C. A. Hagmann, V. V. Hristov, A. E. Lange, M. Lim, P. M. Lubin, P. D. Mauskopf, P. R. Meinhold, P. L. Richards, G. F. Smoot, S. T. Tanaka, P. T. Timbie, C. A. Wuensche

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35 Scopus citations

Abstract

We present results from two four-frequency observations centered near the stars Sigma Herculis and Iota Draconis during the fourth flight of the Millimeter-wave Anisotropy eXperiment (MAX). The observations were made of 6° × 0°.6 strips of the sky with a 1°.4 peak to peak sinusoidal chop in all bands. The FWHM beam sizes were calculated 0°.55 ± 0°.05 at 3.5 cm-1 and a 0°.75 ± 0°.05, at 6, 9, and 14 cm-1. Significant correlated structures were observed at 3.5, 6, and 9 cm-1. The spectra of these signals are inconsistent with thermal emission from known interstellar dust populations. The extrapolated amplitudes of synchrotron and free-free emission are too small to account for the amplitude of the observed structures. If the observed structures are attributed to CMB anisotropy with a Gaussian autocorrelation function and a coherence angle of 25′, then the most probable values at ΔT/TCMB = 3.1-1.3+1.7 × 10-5 for the Sigma Herculis scan, and ΔT/TCMB = 3.3-1.1+1.1 × 10-5 for the Iota Draconis scan (95% confidence upper, lower limits).

Original languageEnglish (US)
Pages (from-to)L57-L60
JournalAstrophysical Journal
Volume433
Issue number2 PART 2
StatePublished - Oct 1 1994
Externally publishedYes

Keywords

  • Cosmic microwave background
  • Cosmology: observations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Clapp, A. C., Devlin, M. J., Gundersen, J. O., Hagmann, C. A., Hristov, V. V., Lange, A. E., Lim, M., Lubin, P. M., Mauskopf, P. D., Meinhold, P. R., Richards, P. L., Smoot, G. F., Tanaka, S. T., Timbie, P. T., & Wuensche, C. A. (1994). Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and Iota Draconis. Astrophysical Journal, 433(2 PART 2), L57-L60.