Study of redshifted H I from the epoch of reionization with drift scan

Sourabh Paul; Shiv K. Sethi; Ravi Subrahmanyan; N. Udaya Shankar; K. S. Dwarakanath; Avinash A. Deshpande; Gianni Bernardi; Judd D. Bowman; Frank Briggs; Roger J. Cappallo; Brian E. Corey; David Emrich; Bryan M. Gaensler; Robert F. Goeke; Lincoln J. Greenhill; Bryna J. Hazelton; Jacqueline N. Hewitt; Melanie Johnston-Hollitt; David L. Kaplan; Justin C. Kasper; Eric Kratzenberg; Colin J. Lonsdale; Mervyn J. Lynch; S. Russell McWhirter; Daniel A. Mitchell; Miguel F. Morales; Edward H. Morgan; Divya Oberoi; Stephen M. Ord; Thiagaraj Prabu; Alan E.E. Rogers; Anish A. Roshi; K. S. Srivani; Steven J. Tingay; Randall B. Wayth; Mark Waterson; Rachel L. Webster; Alan R. Whitney; Andrew J. Williams; Christopher L. Williams

doi:10.1088/0004-637X/793/1/28

Study of redshifted H I from the epoch of reionization with drift scan

Sourabh Paul, Shiv K. Sethi, Ravi Subrahmanyan, N. Udaya Shankar, K. S. Dwarakanath, Avinash A. Deshpande, Gianni Bernardi, Judd D. Bowman, Frank Briggs, Roger J. Cappallo, Brian E. Corey, David Emrich, Bryan M. Gaensler, Robert F. Goeke, Lincoln J. Greenhill, Bryna J. Hazelton, Jacqueline N. Hewitt, Melanie Johnston-Hollitt, David L. Kaplan, Justin C. KasperEric Kratzenberg, Colin J. Lonsdale, Mervyn J. Lynch, S. Russell McWhirter, Daniel A. Mitchell, Miguel F. Morales, Edward H. Morgan, Divya Oberoi, Stephen M. Ord, Thiagaraj Prabu, Alan E.E. Rogers, Anish A. Roshi, K. S. Srivani, Steven J. Tingay, Randall B. Wayth, Mark Waterson, Rachel L. Webster, Alan R. Whitney, Andrew J. Williams, Christopher L. Williams

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10 Citations (Scopus)

Abstract

Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection of the EoR signal using the drift scan strategy. This method potentially has better instrumental stability compared to the case where a single patch of sky is tracked. We demonstrate that the correlation time between measured visibilities could extend up to 1-2 hr for an interferometer array such as the Murchison Widefield Array, which has a wide primary beam. We estimate the EoR power based on a cross-correlation of visibilities over time and show that the drift scan strategy is capable of detecting the EoR signal with a signal to noise that is comparable/better compared to the tracking case. We also estimate the visibility correlation for a set of bright point sources and argue that the statistical inhomogeneity of bright point sources might allow their separation from the EoR signal.

Original language	English
Article number	28
Journal	Astrophysical Journal
Volume	793
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/793/1/28
Publication status	Published - 20 Sept 2014

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Paul, S., Sethi, S. K., Subrahmanyan, R., Shankar, N. U., Dwarakanath, K. S., Deshpande, A. A., Bernardi, G., Bowman, J. D., Briggs, F., Cappallo, R. J., Corey, B. E., Emrich, D., Gaensler, B. M., Goeke, R. F., Greenhill, L. J., Hazelton, B. J., Hewitt, J. N., Johnston-Hollitt, M., Kaplan, D. L., ... Williams, C. L. (2014). Study of redshifted H I from the epoch of reionization with drift scan. Astrophysical Journal, 793(1), Article 28. https://doi.org/10.1088/0004-637X/793/1/28

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title = "Study of redshifted H I from the epoch of reionization with drift scan",

abstract = "Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection of the EoR signal using the drift scan strategy. This method potentially has better instrumental stability compared to the case where a single patch of sky is tracked. We demonstrate that the correlation time between measured visibilities could extend up to 1-2 hr for an interferometer array such as the Murchison Widefield Array, which has a wide primary beam. We estimate the EoR power based on a cross-correlation of visibilities over time and show that the drift scan strategy is capable of detecting the EoR signal with a signal to noise that is comparable/better compared to the tracking case. We also estimate the visibility correlation for a set of bright point sources and argue that the statistical inhomogeneity of bright point sources might allow their separation from the EoR signal.",

keywords = "cosmology: observations, cosmology: theory, dark ages, reionization, first stars, techniques: interferometric",

author = "Sourabh Paul and Sethi, {Shiv K.} and Ravi Subrahmanyan and Shankar, {N. Udaya} and Dwarakanath, {K. S.} and Deshpande, {Avinash A.} and Gianni Bernardi and Bowman, {Judd D.} and Frank Briggs and Cappallo, {Roger J.} and Corey, {Brian E.} and David Emrich and Gaensler, {Bryan M.} and Goeke, {Robert F.} and Greenhill, {Lincoln J.} and Hazelton, {Bryna J.} and Hewitt, {Jacqueline N.} and Melanie Johnston-Hollitt and Kaplan, {David L.} and Kasper, {Justin C.} and Eric Kratzenberg and Lonsdale, {Colin J.} and Lynch, {Mervyn J.} and McWhirter, {S. Russell} and Mitchell, {Daniel A.} and Morales, {Miguel F.} and Morgan, {Edward H.} and Divya Oberoi and Ord, {Stephen M.} and Thiagaraj Prabu and Rogers, {Alan E.E.} and Roshi, {Anish A.} and Srivani, {K. S.} and Tingay, {Steven J.} and Wayth, {Randall B.} and Mark Waterson and Webster, {Rachel L.} and Whitney, {Alan R.} and Williams, {Andrew J.} and Williams, {Christopher L.}",

year = "2014",

month = sep,

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doi = "10.1088/0004-637X/793/1/28",

language = "English",

volume = "793",

journal = "Astrophysical Journal",

issn = "0004-637X",

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Paul, S, Sethi, SK, Subrahmanyan, R, Shankar, NU, Dwarakanath, KS, Deshpande, AA, Bernardi, G, Bowman, JD, Briggs, F, Cappallo, RJ, Corey, BE, Emrich, D, Gaensler, BM, Goeke, RF, Greenhill, LJ, Hazelton, BJ, Hewitt, JN, Johnston-Hollitt, M, Kaplan, DL, Kasper, JC, Kratzenberg, E, Lonsdale, CJ, Lynch, MJ, McWhirter, SR, Mitchell, DA, Morales, MF, Morgan, EH, Oberoi, D, Ord, SM, Prabu, T, Rogers, AEE, Roshi, AA, Srivani, KS, Tingay, SJ, Wayth, RB, Waterson, M, Webster, RL, Whitney, AR, Williams, AJ & Williams, CL 2014, 'Study of redshifted H I from the epoch of reionization with drift scan', Astrophysical Journal, vol. 793, no. 1, 28. https://doi.org/10.1088/0004-637X/793/1/28

TY - JOUR

T1 - Study of redshifted H I from the epoch of reionization with drift scan

AU - Paul, Sourabh

AU - Sethi, Shiv K.

AU - Subrahmanyan, Ravi

AU - Shankar, N. Udaya

AU - Dwarakanath, K. S.

AU - Deshpande, Avinash A.

AU - Bernardi, Gianni

AU - Bowman, Judd D.

AU - Briggs, Frank

AU - Cappallo, Roger J.

AU - Corey, Brian E.

AU - Emrich, David

AU - Gaensler, Bryan M.

AU - Goeke, Robert F.

AU - Greenhill, Lincoln J.

AU - Hazelton, Bryna J.

AU - Hewitt, Jacqueline N.

AU - Johnston-Hollitt, Melanie

AU - Kaplan, David L.

AU - Kasper, Justin C.

AU - Kratzenberg, Eric

AU - Lonsdale, Colin J.

AU - Lynch, Mervyn J.

AU - McWhirter, S. Russell

AU - Mitchell, Daniel A.

AU - Morales, Miguel F.

AU - Morgan, Edward H.

AU - Oberoi, Divya

AU - Ord, Stephen M.

AU - Prabu, Thiagaraj

AU - Rogers, Alan E.E.

AU - Roshi, Anish A.

AU - Srivani, K. S.

AU - Tingay, Steven J.

AU - Wayth, Randall B.

AU - Waterson, Mark

AU - Webster, Rachel L.

AU - Whitney, Alan R.

AU - Williams, Andrew J.

AU - Williams, Christopher L.

PY - 2014/9/20

Y1 - 2014/9/20

N2 - Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection of the EoR signal using the drift scan strategy. This method potentially has better instrumental stability compared to the case where a single patch of sky is tracked. We demonstrate that the correlation time between measured visibilities could extend up to 1-2 hr for an interferometer array such as the Murchison Widefield Array, which has a wide primary beam. We estimate the EoR power based on a cross-correlation of visibilities over time and show that the drift scan strategy is capable of detecting the EoR signal with a signal to noise that is comparable/better compared to the tracking case. We also estimate the visibility correlation for a set of bright point sources and argue that the statistical inhomogeneity of bright point sources might allow their separation from the EoR signal.

AB - Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection of the EoR signal using the drift scan strategy. This method potentially has better instrumental stability compared to the case where a single patch of sky is tracked. We demonstrate that the correlation time between measured visibilities could extend up to 1-2 hr for an interferometer array such as the Murchison Widefield Array, which has a wide primary beam. We estimate the EoR power based on a cross-correlation of visibilities over time and show that the drift scan strategy is capable of detecting the EoR signal with a signal to noise that is comparable/better compared to the tracking case. We also estimate the visibility correlation for a set of bright point sources and argue that the statistical inhomogeneity of bright point sources might allow their separation from the EoR signal.

KW - cosmology: observations

KW - cosmology: theory

KW - dark ages, reionization, first stars

KW - techniques: interferometric

UR - http://www.scopus.com/inward/record.url?scp=84906964108&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/793/1/28

DO - 10.1088/0004-637X/793/1/28

M3 - Article

SN - 0004-637X

VL - 793

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 28

ER -

Study of redshifted H I from the epoch of reionization with drift scan

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