New 145MHz source measurements by paper in the southern sky

Daniel C. Jacobs, James E. Aguirre, Aaron R. Parsons, Jonathan C. Pober, Richard F. Bradley, Chrisl Carilli, Nicole E. Gugliucci, Jason R. Manley, Carel Van Der Merwe, David F. Moore, Chaitalir Parashare

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

We present observations from the Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa, observed in 2010 May and September. Using two nights of drift scanning with PAPER's 60° FWHM beam we have made a map covering the entire sky below +10° declination with an effective center frequency of 145MHz, a 70MHz bandwidth, and a resolution of 26′. A 4800 deg2 region of this large map with the lowest Galactic emission reaches an rms of 0.7 Jy. We establish an absolute flux scale using sources from the 160MHz Culgoora catalog. Using the 408MHz Molonglo Reference Catalog (MRC) as a finding survey, we identify counterparts to 480 sources in our maps and compare our fluxes to the MRC and to 332 sources in the Culgoora catalog. For both catalogs, the ratio of PAPER to catalog flux averages to 1, with a standard deviation of 50%. This measured variation is consistent with comparisons between independent catalogs observed at different bands. The PAPER data represent new 145MHz flux measurements for a large number of sources in the band expected to encompass cosmic reionization and represents a significant step toward establishing a model for removing foregrounds to the reionization signal.

Original languageEnglish (US)
Article numberL34
JournalAstrophysical Journal Letters
Volume734
Issue number2 PART 2
DOIs
StatePublished - Jun 20 2011

Keywords

  • catalogs
  • dark ages, reionization, first stars
  • instrumentation: interferometers

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Jacobs, D. C., Aguirre, J. E., Parsons, A. R., Pober, J. C., Bradley, R. F., Carilli, C., Gugliucci, N. E., Manley, J. R., Van Der Merwe, C., Moore, D. F., & Parashare, C. (2011). New 145MHz source measurements by paper in the southern sky. Astrophysical Journal Letters, 734(2 PART 2), [L34]. https://doi.org/10.1088/2041-8205/734/2/L34