Small-scale cosmic microwave background observations at 8.4 GHz

R. Bruce Partridge, Eric A. Richards, Edward B. Fomalont, K. I. Kellerman, Rogier Windhorst

Research output: Contribution to journalArticle

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Abstract

We have used the Very Large Array (VLA) of the National Radio Astronomy Observatory at 8.44 GHz to image a ∼40 arcmin2 field with an uprecedented rms sensitivity of 1.5 μJy. After correcting for the effects of discrete foreground radio sources, we examined this most sensitive microwave image of the sky for fluctuations in the cosmic microwave background radiation (CBR). At the 6″ resolution of our VLA map, ΔT/T ≈ (0.7 ±0.8) × 10-4, with an upper limit of 1.3 × 10-4 at 95% confidence. At 1′ resolution, we measure a fluctuation amplitude of ΔT/T = (1.2 ± 1.4) × 10-5. We also report on our observations of the linear and circular polarization of the CBR for which we derive upper limits (at 95% confidence) of ΔT/T ≤ 1.1 × 10-5 and ΔT/T ≤ 1.6 × 10-5, respectively, on an angular scale of 1′.

Original languageEnglish (US)
Pages (from-to)38-50
Number of pages13
JournalAstrophysical Journal
Volume483
Issue number1 PART I
DOIs
StatePublished - 1997

Fingerprint

cosmic microwave background radiation
Very Large Array (VLA)
confidence
microwaves
radio astronomy
circular polarization
linear polarization
radio
sky
observatories
astronomy
sensitivity
polarization
observatory
microwave
background radiation

Keywords

  • Cosmic microwave background
  • Cosmology: observations
  • Radio continuum: general

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Partridge, R. B., Richards, E. A., Fomalont, E. B., Kellerman, K. I., & Windhorst, R. (1997). Small-scale cosmic microwave background observations at 8.4 GHz. Astrophysical Journal, 483(1 PART I), 38-50. https://doi.org/10.1086/304226

Small-scale cosmic microwave background observations at 8.4 GHz. / Partridge, R. Bruce; Richards, Eric A.; Fomalont, Edward B.; Kellerman, K. I.; Windhorst, Rogier.

In: Astrophysical Journal, Vol. 483, No. 1 PART I, 1997, p. 38-50.

Research output: Contribution to journalArticle

Partridge, RB, Richards, EA, Fomalont, EB, Kellerman, KI & Windhorst, R 1997, 'Small-scale cosmic microwave background observations at 8.4 GHz', Astrophysical Journal, vol. 483, no. 1 PART I, pp. 38-50. https://doi.org/10.1086/304226
Partridge, R. Bruce ; Richards, Eric A. ; Fomalont, Edward B. ; Kellerman, K. I. ; Windhorst, Rogier. / Small-scale cosmic microwave background observations at 8.4 GHz. In: Astrophysical Journal. 1997 ; Vol. 483, No. 1 PART I. pp. 38-50.
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