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

Clapp, A. C., Devlin, M. J., Gundersen, J. O., Hagmann, C. A., Hristov, V. V., Lange, A. E., Lim, M., Lubin, P. M, Mauskopf, Philip Daniel ORCID: https://orcid.org/0000-0001-6397-5516, Meinhold, P. R., Richards, P. L., Smoot, G. F., Timbie, S. T., Tanaka, P. T. and Wuensche, C. A. 1994. Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars sigma Hercules and Iota Draconis. Astrophysical Journal Letters 433 (2) , pp. 57-60. 10.1086/187547

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Abstract

We present results from two four-frequency observations centered near the stars Sigma Hercules and Iota Draconis during the fourth flight of the Millimeter-wave Anisotropy eXperiment (MAX). The observations were made of 6 x 0.6-degree strips of the sky with 1.4-degree peak to peak sinusoidal chop in all bands. The FWHM beam sizes were 0.55+/-0.05 degrees at 3.5 cm-1 and a 0.75+/-0.05 degrees 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 are DT/TCMB = (3.1 +1.7-1.3) x 10^-5 for the Sigma Hercules scan, and DT/TCMB = (3.3 +/- 1.1) x 10^-5 for the Iota Draconis scan (95% confidence upper and lower limits). Finally a comparison of all six MAX scans is presented.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	Anisotropy, Background Radiation, Big Bang Cosmology, Radio Astronomy, Relic Radiation, Centimeter Waves, Cosmic Dust, Decimeter Waves, Radio Spectra, Superhigh Frequencies, Ultrahigh Frequencies
Publisher:	IOP Science
ISSN:	0004-637X
Last Modified:	28 Oct 2022 08:29
URI:	https://orca.cardiff.ac.uk/id/eprint/70961

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