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

doi:10.1086/187547

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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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/T_CMB = 3.1_-1.3^+1.7 × 10^-5 for the Sigma Herculis scan, and ΔT/T_CMB = 3.3_-1.1^+1.1 × 10^-5 for the Iota Draconis scan (95% confidence upper, lower limits).

Original language	English (US)
Pages (from-to)	L57-L60
Journal	Astrophysical Journal
Volume	433
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/187547
State	Published - Oct 1 1994
Externally published	Yes

Keywords

Cosmic microwave background
Cosmology: observations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/187547

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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. https://doi.org/10.1086/187547

Clapp, AC, Devlin, MJ, Gundersen, JO, Hagmann, CA, Hristov, VV, Lange, AE, Lim, M, Lubin, PM, Mauskopf, PD, Meinhold, PR, Richards, PL, Smoot, GF, Tanaka, ST, Timbie, PT & Wuensche, CA 1994, 'Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and Iota Draconis', Astrophysical Journal, vol. 433, no. 2 PART 2, pp. L57-L60. https://doi.org/10.1086/187547

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

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).",

keywords = "Cosmic microwave background, Cosmology: observations",

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

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T1 - Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and Iota Draconis

AU - Clapp, A. C.

AU - Devlin, M. J.

AU - Gundersen, J. O.

AU - Hagmann, C. A.

AU - Hristov, V. V.

AU - Lange, A. E.

AU - Lim, M.

AU - Lubin, P. M.

AU - Mauskopf, P. D.

AU - Meinhold, P. R.

AU - Richards, P. L.

AU - Smoot, G. F.

AU - Tanaka, S. T.

AU - Timbie, P. T.

AU - Wuensche, C. A.

PY - 1994/10/1

Y1 - 1994/10/1

N2 - 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).

AB - 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).

KW - Cosmic microwave background

KW - Cosmology: observations

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JF - Astrophysical Journal

IS - 2 PART 2

ER -

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

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