Measurements of anisotropy in the cosmic microwave background radiation at 0°.5 scales near the stars HR 5127 and φ Herculis

S. T. Tanaka, A. C. Clapp, M. J. Devlin, N. Figueiredo, Joshua Gundersen, S. Hanany, V. V. Hristov, A. E. Lange, M. A. Lim, P. M. Lubin, P. R. Meinhold, P. L. Richards, G. F. Smoot, J. Staren

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Abstract

We present measurements of cosmic microwave background (CMB) anisotropy near the stars HR 5127 and φ Herculis from the fifth flight of the Millimeter-wave Anisotropy eXperiment (MAX). We scanned 8° strips of the sky with an approximately Gaussian 0°.5 FWHM beam and a 1°.4 peak to peak sinusoidal chop. The instrument has four frequency bands centered at 3.5, 6, 9, and 14 cm-1. The IRAS 100 μm map predicts that these two regions have low interstellar dust contrast. The HR 5127 data are consistent with CMB anisotropy. The φ Herculis data, which were measured at lower flight altitudes, show time variability at 9 and 14 cm-1, which we believe to be due to atmospheric emission. However, the φ Herculis data at 3.5 and 6 cm-1 are essentially independent of this atmospheric contribution and are consistent with CMB anisotropy. Confusion from Galactic foregrounds is unlikely based on the spectrum and amplitude of the structure at these frequencies. If the observed HR 5127 structure and the atmosphere-independent φ Herculis structure are attributed to CMB anisotropy, then we find ΔT/T = 〈l(l + 1)Cl/2π〉1/2 = 1.2-0.3 +0.4 × 10-5 for HR 5127 and 1.9-0.4 +0.7 × 10-5 for φ Herculis in the flat band approximation. The upper and lower limits represent a 68% confidence interval added in quadrature with a 10% calibration uncertainty.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume468
Issue number2 PART II
StatePublished - Sep 10 1996
Externally publishedYes

Fingerprint

cosmic microwave background radiation
anisotropy
stars
microwaves
flight altitude
flight
airglow
low altitude
confusion
Infrared Astronomy Satellite
quadratures
millimeter waves
confidence interval
sky
confidence
strip
dust
background radiation
microwave
calibration

Keywords

  • Cosmic microwave background
  • Cosmology: observations

ASJC Scopus subject areas

  • Space and Planetary Science
  • Nuclear and High Energy Physics

Cite this

Tanaka, S. T., Clapp, A. C., Devlin, M. J., Figueiredo, N., Gundersen, J., Hanany, S., ... Staren, J. (1996). Measurements of anisotropy in the cosmic microwave background radiation at 0°.5 scales near the stars HR 5127 and φ Herculis. Astrophysical Journal, 468(2 PART II).

Measurements of anisotropy in the cosmic microwave background radiation at 0°.5 scales near the stars HR 5127 and φ Herculis. / Tanaka, S. T.; Clapp, A. C.; Devlin, M. J.; Figueiredo, N.; Gundersen, Joshua; Hanany, S.; Hristov, V. V.; Lange, A. E.; Lim, M. A.; Lubin, P. M.; Meinhold, P. R.; Richards, P. L.; Smoot, G. F.; Staren, J.

In: Astrophysical Journal, Vol. 468, No. 2 PART II, 10.09.1996.

Research output: Contribution to journalArticle

Tanaka, ST, Clapp, AC, Devlin, MJ, Figueiredo, N, Gundersen, J, Hanany, S, Hristov, VV, Lange, AE, Lim, MA, Lubin, PM, Meinhold, PR, Richards, PL, Smoot, GF & Staren, J 1996, 'Measurements of anisotropy in the cosmic microwave background radiation at 0°.5 scales near the stars HR 5127 and φ Herculis', Astrophysical Journal, vol. 468, no. 2 PART II.
Tanaka, S. T. ; Clapp, A. C. ; Devlin, M. J. ; Figueiredo, N. ; Gundersen, Joshua ; Hanany, S. ; Hristov, V. V. ; Lange, A. E. ; Lim, M. A. ; Lubin, P. M. ; Meinhold, P. R. ; Richards, P. L. ; Smoot, G. F. ; Staren, J. / Measurements of anisotropy in the cosmic microwave background radiation at 0°.5 scales near the stars HR 5127 and φ Herculis. In: Astrophysical Journal. 1996 ; Vol. 468, No. 2 PART II.
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abstract = "We present measurements of cosmic microwave background (CMB) anisotropy near the stars HR 5127 and φ Herculis from the fifth flight of the Millimeter-wave Anisotropy eXperiment (MAX). We scanned 8° strips of the sky with an approximately Gaussian 0°.5 FWHM beam and a 1°.4 peak to peak sinusoidal chop. The instrument has four frequency bands centered at 3.5, 6, 9, and 14 cm-1. The IRAS 100 μm map predicts that these two regions have low interstellar dust contrast. The HR 5127 data are consistent with CMB anisotropy. The φ Herculis data, which were measured at lower flight altitudes, show time variability at 9 and 14 cm-1, which we believe to be due to atmospheric emission. However, the φ Herculis data at 3.5 and 6 cm-1 are essentially independent of this atmospheric contribution and are consistent with CMB anisotropy. Confusion from Galactic foregrounds is unlikely based on the spectrum and amplitude of the structure at these frequencies. If the observed HR 5127 structure and the atmosphere-independent φ Herculis structure are attributed to CMB anisotropy, then we find ΔT/T = 〈l(l + 1)Cl/2π〉1/2 = 1.2-0.3 +0.4 × 10-5 for HR 5127 and 1.9-0.4 +0.7 × 10-5 for φ Herculis in the flat band approximation. The upper and lower limits represent a 68{\%} confidence interval added in quadrature with a 10{\%} calibration uncertainty.",
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AU - Devlin, M. J.

AU - Figueiredo, N.

AU - Gundersen, Joshua

AU - Hanany, S.

AU - Hristov, V. V.

AU - Lange, A. E.

AU - Lim, M. A.

AU - Lubin, P. M.

AU - Meinhold, P. R.

AU - Richards, P. L.

AU - Smoot, G. F.

AU - Staren, J.

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N2 - We present measurements of cosmic microwave background (CMB) anisotropy near the stars HR 5127 and φ Herculis from the fifth flight of the Millimeter-wave Anisotropy eXperiment (MAX). We scanned 8° strips of the sky with an approximately Gaussian 0°.5 FWHM beam and a 1°.4 peak to peak sinusoidal chop. The instrument has four frequency bands centered at 3.5, 6, 9, and 14 cm-1. The IRAS 100 μm map predicts that these two regions have low interstellar dust contrast. The HR 5127 data are consistent with CMB anisotropy. The φ Herculis data, which were measured at lower flight altitudes, show time variability at 9 and 14 cm-1, which we believe to be due to atmospheric emission. However, the φ Herculis data at 3.5 and 6 cm-1 are essentially independent of this atmospheric contribution and are consistent with CMB anisotropy. Confusion from Galactic foregrounds is unlikely based on the spectrum and amplitude of the structure at these frequencies. If the observed HR 5127 structure and the atmosphere-independent φ Herculis structure are attributed to CMB anisotropy, then we find ΔT/T = 〈l(l + 1)Cl/2π〉1/2 = 1.2-0.3 +0.4 × 10-5 for HR 5127 and 1.9-0.4 +0.7 × 10-5 for φ Herculis in the flat band approximation. The upper and lower limits represent a 68% confidence interval added in quadrature with a 10% calibration uncertainty.

AB - We present measurements of cosmic microwave background (CMB) anisotropy near the stars HR 5127 and φ Herculis from the fifth flight of the Millimeter-wave Anisotropy eXperiment (MAX). We scanned 8° strips of the sky with an approximately Gaussian 0°.5 FWHM beam and a 1°.4 peak to peak sinusoidal chop. The instrument has four frequency bands centered at 3.5, 6, 9, and 14 cm-1. The IRAS 100 μm map predicts that these two regions have low interstellar dust contrast. The HR 5127 data are consistent with CMB anisotropy. The φ Herculis data, which were measured at lower flight altitudes, show time variability at 9 and 14 cm-1, which we believe to be due to atmospheric emission. However, the φ Herculis data at 3.5 and 6 cm-1 are essentially independent of this atmospheric contribution and are consistent with CMB anisotropy. Confusion from Galactic foregrounds is unlikely based on the spectrum and amplitude of the structure at these frequencies. If the observed HR 5127 structure and the atmosphere-independent φ Herculis structure are attributed to CMB anisotropy, then we find ΔT/T = 〈l(l + 1)Cl/2π〉1/2 = 1.2-0.3 +0.4 × 10-5 for HR 5127 and 1.9-0.4 +0.7 × 10-5 for φ Herculis in the flat band approximation. The upper and lower limits represent a 68% confidence interval added in quadrature with a 10% calibration uncertainty.

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