DELAY SPECTRUM with PHASE-TRACKING ARRAYS: EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION

Sourabh Paul, Shiv K. Sethi, Miguel F. Morales, K. S. Dwarkanath, N. Udaya Shankar, Ravi Subrahmanyan, N. Barry, A. P. Beardsley, Judd Bowman, F. Briggs, P. Carroll, A. De Oliveira-Costa, Joshua S. Dillon, A. Ewall-Wice, L. Feng, L. J. Greenhill, B. M. Gaensler, B. J. Hazelton, J. N. Hewitt, N. Hurley-WalkerD. J. Jacobs, Han Seek Kim, P. Kittiwisit, E. Lenc, J. Line, A. Loeb, B. McKinley, D. A. Mitchell, A. R. Neben, A. R. Offringa, B. Pindor, J. C. Pober, P. Procopio, J. Riding, I. S. Sullivan, M. Tegmark, Nithyanandan Thyagarajan, S. J. Tingay, C. M. Trott, R. B. Wayth, R. L. Webster, J. S.B. Wyithe, Roger Cappallo, M. Johnston-Hollitt, D. L. Kaplan, C. J. Lonsdale, S. R. McWhirter, E. Morgan, D. Oberoi, S. M. Ord, T. Prabu, K. S. Srivani, A. Williams, C. L. Williams

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach, to extract H i power spectra that are applicable to tracking observations using an imaging radio interferometer (»Delay Spectrum with Imaging Arrays»). Our method is based on modeling the H i signal taking into account the impact of wide field effects such as the w-term, which are then used as appropriate weights in cross-correlating the measured visibilities. Our method is applicable to any radio interferometer that tracks a phase center and could be utilized for arrays such as the Murchison Widefield Array (MWA), Low Frequency Array (LOFAR), Giant Meterwave Radio Telescope (GMRT), Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER), and HERA. In the literature the delay spectrum approach has been implemented for near-redundant baselines using drift scan observations. In this paper we explore the scheme for non-redundant tracking arrays. This is the first application of delay spectrum methodology to such data to extract the H i signal. We analyze 3 hr of MWA tracking data on the EoR1 field. We present both two-dimensional () and one-dimensional (k) power spectra from the analysis. Our results are in agreement with the findings of other pipelines developed to analyze the MWA EoR data.

Original languageEnglish (US)
Article number213
JournalAstrophysical Journal
Volume833
Issue number2
DOIs
StatePublished - Dec 20 2016

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radio interferometers
time measurement
radio
interferometer
power spectra
radio telescopes
visibility
methodology
low frequencies
modeling
method
effect
detection
analysis

Keywords

  • cosmology: observations
  • cosmology: theory
  • dark ages, reionization, first stars
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Paul, S., Sethi, S. K., Morales, M. F., Dwarkanath, K. S., Shankar, N. U., Subrahmanyan, R., ... Williams, C. L. (2016). DELAY SPECTRUM with PHASE-TRACKING ARRAYS: EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION. Astrophysical Journal, 833(2), [213]. https://doi.org/10.3847/1538-4357/833/2/213

DELAY SPECTRUM with PHASE-TRACKING ARRAYS : EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION. / Paul, Sourabh; Sethi, Shiv K.; Morales, Miguel F.; Dwarkanath, K. S.; Shankar, N. Udaya; Subrahmanyan, Ravi; Barry, N.; Beardsley, A. P.; Bowman, Judd; Briggs, F.; Carroll, P.; De Oliveira-Costa, A.; Dillon, Joshua S.; Ewall-Wice, A.; Feng, L.; Greenhill, L. J.; Gaensler, B. M.; Hazelton, B. J.; Hewitt, J. N.; Hurley-Walker, N.; Jacobs, D. J.; Kim, Han Seek; Kittiwisit, P.; Lenc, E.; Line, J.; Loeb, A.; McKinley, B.; Mitchell, D. A.; Neben, A. R.; Offringa, A. R.; Pindor, B.; Pober, J. C.; Procopio, P.; Riding, J.; Sullivan, I. S.; Tegmark, M.; Thyagarajan, Nithyanandan; Tingay, S. J.; Trott, C. M.; Wayth, R. B.; Webster, R. L.; Wyithe, J. S.B.; Cappallo, Roger; Johnston-Hollitt, M.; Kaplan, D. L.; Lonsdale, C. J.; McWhirter, S. R.; Morgan, E.; Oberoi, D.; Ord, S. M.; Prabu, T.; Srivani, K. S.; Williams, A.; Williams, C. L.

In: Astrophysical Journal, Vol. 833, No. 2, 213, 20.12.2016.

Research output: Contribution to journalArticle

Paul, S, Sethi, SK, Morales, MF, Dwarkanath, KS, Shankar, NU, Subrahmanyan, R, Barry, N, Beardsley, AP, Bowman, J, Briggs, F, Carroll, P, De Oliveira-Costa, A, Dillon, JS, Ewall-Wice, A, Feng, L, Greenhill, LJ, Gaensler, BM, Hazelton, BJ, Hewitt, JN, Hurley-Walker, N, Jacobs, DJ, Kim, HS, Kittiwisit, P, Lenc, E, Line, J, Loeb, A, McKinley, B, Mitchell, DA, Neben, AR, Offringa, AR, Pindor, B, Pober, JC, Procopio, P, Riding, J, Sullivan, IS, Tegmark, M, Thyagarajan, N, Tingay, SJ, Trott, CM, Wayth, RB, Webster, RL, Wyithe, JSB, Cappallo, R, Johnston-Hollitt, M, Kaplan, DL, Lonsdale, CJ, McWhirter, SR, Morgan, E, Oberoi, D, Ord, SM, Prabu, T, Srivani, KS, Williams, A & Williams, CL 2016, 'DELAY SPECTRUM with PHASE-TRACKING ARRAYS: EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION', Astrophysical Journal, vol. 833, no. 2, 213. https://doi.org/10.3847/1538-4357/833/2/213
Paul, Sourabh ; Sethi, Shiv K. ; Morales, Miguel F. ; Dwarkanath, K. S. ; Shankar, N. Udaya ; Subrahmanyan, Ravi ; Barry, N. ; Beardsley, A. P. ; Bowman, Judd ; Briggs, F. ; Carroll, P. ; De Oliveira-Costa, A. ; Dillon, Joshua S. ; Ewall-Wice, A. ; Feng, L. ; Greenhill, L. J. ; Gaensler, B. M. ; Hazelton, B. J. ; Hewitt, J. N. ; Hurley-Walker, N. ; Jacobs, D. J. ; Kim, Han Seek ; Kittiwisit, P. ; Lenc, E. ; Line, J. ; Loeb, A. ; McKinley, B. ; Mitchell, D. A. ; Neben, A. R. ; Offringa, A. R. ; Pindor, B. ; Pober, J. C. ; Procopio, P. ; Riding, J. ; Sullivan, I. S. ; Tegmark, M. ; Thyagarajan, Nithyanandan ; Tingay, S. J. ; Trott, C. M. ; Wayth, R. B. ; Webster, R. L. ; Wyithe, J. S.B. ; Cappallo, Roger ; Johnston-Hollitt, M. ; Kaplan, D. L. ; Lonsdale, C. J. ; McWhirter, S. R. ; Morgan, E. ; Oberoi, D. ; Ord, S. M. ; Prabu, T. ; Srivani, K. S. ; Williams, A. ; Williams, C. L. / DELAY SPECTRUM with PHASE-TRACKING ARRAYS : EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION. In: Astrophysical Journal. 2016 ; Vol. 833, No. 2.
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abstract = "The detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach, to extract H i power spectra that are applicable to tracking observations using an imaging radio interferometer (»Delay Spectrum with Imaging Arrays»). Our method is based on modeling the H i signal taking into account the impact of wide field effects such as the w-term, which are then used as appropriate weights in cross-correlating the measured visibilities. Our method is applicable to any radio interferometer that tracks a phase center and could be utilized for arrays such as the Murchison Widefield Array (MWA), Low Frequency Array (LOFAR), Giant Meterwave Radio Telescope (GMRT), Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER), and HERA. In the literature the delay spectrum approach has been implemented for near-redundant baselines using drift scan observations. In this paper we explore the scheme for non-redundant tracking arrays. This is the first application of delay spectrum methodology to such data to extract the H i signal. We analyze 3 hr of MWA tracking data on the EoR1 field. We present both two-dimensional () and one-dimensional (k) power spectra from the analysis. Our results are in agreement with the findings of other pipelines developed to analyze the MWA EoR data.",
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T2 - EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION

AU - Paul, Sourabh

AU - Sethi, Shiv K.

AU - Morales, Miguel F.

AU - Dwarkanath, K. S.

AU - Shankar, N. Udaya

AU - Subrahmanyan, Ravi

AU - Barry, N.

AU - Beardsley, A. P.

AU - Bowman, Judd

AU - Briggs, F.

AU - Carroll, P.

AU - De Oliveira-Costa, A.

AU - Dillon, Joshua S.

AU - Ewall-Wice, A.

AU - Feng, L.

AU - Greenhill, L. J.

AU - Gaensler, B. M.

AU - Hazelton, B. J.

AU - Hewitt, J. N.

AU - Hurley-Walker, N.

AU - Jacobs, D. J.

AU - Kim, Han Seek

AU - Kittiwisit, P.

AU - Lenc, E.

AU - Line, J.

AU - Loeb, A.

AU - McKinley, B.

AU - Mitchell, D. A.

AU - Neben, A. R.

AU - Offringa, A. R.

AU - Pindor, B.

AU - Pober, J. C.

AU - Procopio, P.

AU - Riding, J.

AU - Sullivan, I. S.

AU - Tegmark, M.

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AU - Kaplan, D. L.

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AU - McWhirter, S. R.

AU - Morgan, E.

AU - Oberoi, D.

AU - Ord, S. M.

AU - Prabu, T.

AU - Srivani, K. S.

AU - Williams, A.

AU - Williams, C. L.

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KW - cosmology: theory

KW - dark ages, reionization, first stars

KW - techniques: interferometric

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