The GMRT Epoch of Reionization experiment: a new upper limit on the neutral hydrogen power spectrum at z≈ 8.6

By G. Paciga, Tzu-Ching Chang, Y. Gupta, Rajaram Nityanada, Julia Odegova, Ue-Li Pen, J. Peterson, J. Roy, K. Sigurdson. 2010

152 citations recorded by the source corpus.

We present a new upper limit to the 21cm power spectrum during the Epoch of Reionization (EoR) which constrains reionization models with an unheated IGM. The GMRT-EoR experiment is an ongoing effort to make a statistical detection of the power spectrum of 21cm neutral hydrogen emission at redshift z � 9. Data from this redshift constrain models of the (EoR), the end of the Dark Ages arising from the formation of the first bright UV sources, probably stars or mini-quasars. We present results from approximately 50 hours of observations at the Giant Metrewave Radio Telescope in India from December 2007. We describe radio frequency interference (RFI) localisation schemes which allow bright sources on the ground to be identified and physically removed. Singular-value decomposition is used to remove remaining broadband RFI by identifying ground sources with large eigenvalues. Foregrounds are modelled using a piecewise linear filter and the power spectrum is measured using cross-correlations of foreground subtracted images.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/024da1608a854f162c08da66afb226d5b1df96c6

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In Astronomy and Astrophysics

1. A. Mesinger
2. M. McQuinn
3. S. Furlanetto
4. J. Pritchard
5. C. Carilli
6. L. Hernquist
7. S. Oh
8. A. Lidz

In Nuclear and High Energy Physics

1. S. Furlanetto
2. J. Pritchard
3. A. Mesinger
4. C. Carilli
5. S. Oh
6. A. Lidz
7. J. Aguirre
8. Stefano Gariazzo

Citations in the corpus

• Upper Limits on the 21 cm Epoch of Reionization Power Spectrum from One Night with LOFAR (2017, methodology): “The reasons are the different redshift ranges and k-modes that are being quoted, as well as the considerably different integration times, being 13 h for LOFAR, 32 h for MWA, 40 h for the GMRT, and 1150 h for PAPER, respectively, as well as the use of very different instrumental configurations and po”
• Neutrino Mass Ordering from Oscillations and Beyond: 2018 Status and Future Prospects (2018, methodology): “This is the major goal of experiments as GMRT (Giant Metrewave Radio Telescope) (Ananthakrishnan, 1995; Paciga et al., 2011), LOFAR (LOw Frequency ARray) (van Haarlem et al., 2013), MWA (Murchison Widefield Array) (Tingay et al., 2013) and PAPER (Precision Array for Probing the Epoch of…”
• PAPER-64 CONSTRAINTS ON REIONIZATION: THE 21 cm POWER SPECTRUM AT z = 8.4 (2015, background): “…in the literature include spectral polynomial fitting (Wang et al. 2006; Bowman et al. 2009a; Liu et al. 2009a), principal component analysis (Paciga et al. 2011; Liu & Tegmark 2011; Paciga et al. 2013; Masui et al. 2013), non-parametric subtractions (Harker et al. 2009; Chapman et al.…”
• New Limits on 21cm EoR From PAPER-32 Consistent with an X-Ray Heated IGM at z=7.7 (2013, background): “Although PAPER has less collecting area than other competing 21cm reionization experiments, its ability to access lower k-modes than, e.g., Paciga et al. (2011), as a result of its smooth instrumental responses, combined with the sensitivity boost that arises from the use of a maximum-redundancy…”
• INTENSITY MAPPING WITH CARBON MONOXIDE EMISSION LINES AND THE REDSHIFTED 21 cm LINE (2011, background): “Motivated by the promise of this technique, a first generation of experiments aimed at detecting the 21 cm signal from the EoR is currently underway, including the Murchison Widefield Array (MWA) (Lonsdale et al. 2009); the Low Frequency Array (LOFAR) (Harker et al. 2010); Precision Array for Probin”