The precision array for probing the epoch of re-ionization: Eight station results

Aaron R. Parsons, Donald C. Backer, Griffin S. Foster, Melvyn C.H. Wright, Richard F. Bradley, Nicole E. Gugliucci, Chaitali R. Parashare, Erin E. Benoit, James E. Aguirre, Daniel Jacobs, Chris L. Carilli, David Herne, Mervyn J. Lynch, Jason R. Manley, Daniel J. Werthimer

Research output: Contribution to journalArticle

219 Citations (Scopus)

Abstract

We are developing the Precision Array for Probing the Epoch of Re-ionization (PAPER) to detect 21cm emission from the early universe, when the first stars and galaxies were forming. We describe the overall experiment strategy and architecture and summarize two PAPER deployments: a four-antenna array in the low radio frequency interference (RFI) environment of Western Australia and an eight-antenna array at a prototyping site at the NRAO facilities near Green Bank, WV. From these activities we report on system performance, including primary beam model verification, dependence of system gain on ambient temperature, measurements of receiver and overall system temperatures, and characterization of the RFI environment at each deployment site. We present an all-sky map synthesized between 139MHz and 174MHz using data from both arrays that reaches down to 80mJy (4.9K, for a beam size of 2.15e-5 sr at 156MHz), with a 10mJy (620mK) thermal noise level that indicates what would be achievable with better foreground subtraction. We calculate angular power spectra (C ) in a cold patch and determine them to be dominated by point sources, but with contributions from galactic synchrotron emission at lower radio frequencies and angular wavemodes. Although the sample variance of foregrounds dominates errors in these power spectra, we measure a thermal noise level of 310mK at ℓ = 100 for a 1.46MHz band centered at 164.5MHz. This sensitivity level is approximately 3 orders of magnitude in temperature above the level of the fluctuations in 21cm emission associated with re-ionization.

Original languageEnglish (US)
Pages (from-to)1468-1480
Number of pages13
JournalAstronomical Journal
Volume139
Issue number4
DOIs
StatePublished - Mar 23 2010
Externally publishedYes

Fingerprint

ionization
stations
time measurement
radio frequency interference
thermal noise
antenna arrays
power spectra
radio
antenna
low frequencies
subtraction
point sources
ambient temperature
temperature
temperature measurement
sky
radio frequencies
synchrotrons
universe
receivers

Keywords

  • Cosmology: observations
  • Instrumentation: interferometers
  • Radio continuum: general
  • Site testing
  • Techniques: Interferometric
  • Telescopes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Parsons, A. R., Backer, D. C., Foster, G. S., Wright, M. C. H., Bradley, R. F., Gugliucci, N. E., ... Werthimer, D. J. (2010). The precision array for probing the epoch of re-ionization: Eight station results. Astronomical Journal, 139(4), 1468-1480. https://doi.org/10.1088/0004-6256/139/4/1468

The precision array for probing the epoch of re-ionization : Eight station results. / Parsons, Aaron R.; Backer, Donald C.; Foster, Griffin S.; Wright, Melvyn C.H.; Bradley, Richard F.; Gugliucci, Nicole E.; Parashare, Chaitali R.; Benoit, Erin E.; Aguirre, James E.; Jacobs, Daniel; Carilli, Chris L.; Herne, David; Lynch, Mervyn J.; Manley, Jason R.; Werthimer, Daniel J.

In: Astronomical Journal, Vol. 139, No. 4, 23.03.2010, p. 1468-1480.

Research output: Contribution to journalArticle

Parsons, AR, Backer, DC, Foster, GS, Wright, MCH, Bradley, RF, Gugliucci, NE, Parashare, CR, Benoit, EE, Aguirre, JE, Jacobs, D, Carilli, CL, Herne, D, Lynch, MJ, Manley, JR & Werthimer, DJ 2010, 'The precision array for probing the epoch of re-ionization: Eight station results', Astronomical Journal, vol. 139, no. 4, pp. 1468-1480. https://doi.org/10.1088/0004-6256/139/4/1468
Parsons AR, Backer DC, Foster GS, Wright MCH, Bradley RF, Gugliucci NE et al. The precision array for probing the epoch of re-ionization: Eight station results. Astronomical Journal. 2010 Mar 23;139(4):1468-1480. https://doi.org/10.1088/0004-6256/139/4/1468
Parsons, Aaron R. ; Backer, Donald C. ; Foster, Griffin S. ; Wright, Melvyn C.H. ; Bradley, Richard F. ; Gugliucci, Nicole E. ; Parashare, Chaitali R. ; Benoit, Erin E. ; Aguirre, James E. ; Jacobs, Daniel ; Carilli, Chris L. ; Herne, David ; Lynch, Mervyn J. ; Manley, Jason R. ; Werthimer, Daniel J. / The precision array for probing the epoch of re-ionization : Eight station results. In: Astronomical Journal. 2010 ; Vol. 139, No. 4. pp. 1468-1480.
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