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Measurements of the global 21-cm signal from the Cosmic Dawn

Published online by Cambridge University Press:  08 May 2018

Gianni Bernardi Open the ORCID record for Gianni Bernardi [Opens in a new window]
Gianni Bernardi*
Affiliation:
INAF-Istituto di Radioastronomia, via Gobetti 101, 40129, Bologna, Italy email: gbernardi@ira.inaf.it Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa SKA SA, 3rd Floor, The Park, Park Road, Pinelands, 7405, South Africa
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Abstract

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The sky-averaged (global) 21-cm signal is a very promising probe of the Cosmic Dawn, when the first luminous sources were formed and started to shine in a substantially neutral intergalactic medium. I here report on the status and early result of the Large-Aperture Experiment to Detect the Dark Age that focuses on observations of the global 21-cm signal in the 16 ≲ z ≲ 30 range.

Keywords

cosmology:observations - dark agesreionizationfirst stars - diffuse radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 98 - 101
Copyright
Copyright © International Astronomical Union 2018 

References

Bernardi, G., McQuinn, M. & Greenhill, L. J. (2015). Foreground Model and Antenna Calibration Errors in the Measurement of the Sky-averaged λ21 cm Signal at z ~ 20. ApJ, 799:90.Google Scholar
Bernardi, G., Zwart, J. T. L., Price, D. et al. (2016). Bayesian constraints on the global 21-cm signal from the Cosmic Dawn. MNRAS, 461:2847–2855.CrossRefGoogle Scholar
Field, G. B. (1959). The Spin Temperature of Intergalactic Neutral Hydrogen. ApJ, 129:536.CrossRefGoogle Scholar
Furlanetto, S. R. (2006). The global 21-centimeter background from high redshifts. MNRAS, 371:867–878.CrossRefGoogle Scholar
Furlanetto, S. R. (2016). The 21-cm Line as a Probe of Reionization. Understanding the Epoch of Cosmic Reionization, Astrophysics and Space Science Library, Volume 423. ISBN 978-3-319-21956-1. Springer International Publishing Switzerland, arXiv:1511.01131.Google Scholar
Greenhill, L. J. & Bernardi, G. (2012). HI Epoch of Reionization Arrays. Invited review to the 11th Asian-Pacific Regional IAU Meeting 2011, NARIT Conference Series, Vol. 1 eds. Komonjinda, S., Kovalev, Y., and Ruffolo, D. (2012), arXiv:1201.1700.Google Scholar
Harker, G. J. A., Pritchard, J. R., Burns, J. O. & Bowman, J. D. (2012). An MCMC approach to extracting the global 21-cm signal during the cosmic dawn from sky-averaged radio observations. MNRAS, 419:1070–1084.Google Scholar
McQuinn, M. (2016). The Evolution of the Intergalactic Medium. Annual Review of Astronomy and Astrophysics, 54:313–362.CrossRefGoogle Scholar
Monsalve, R. A., Rogers, A. E. E., Bowman, J. D. & Mozdzen, T. J. (2017). Calibration of the EDGES High-band Receiver to Observe the Global 21 cm Signature from the Epoch of Reionization. ApJ, 835:49.Google Scholar
Mozdzen, T. J., Bowman, J. D., Mosalve, R. A., & Rogers, A. E. E. (2017). Improved measurement of the spectral index of the diffuse radio background between 90 and 190 MHz. MNRAS, 464:4995–5002.CrossRefGoogle Scholar
Mesinger, A., Ferrara, A. & Spiegel, D. N. (2013). Signatures of X-rays in the early Universe. MNRAS, 431:521–637.Google Scholar
Price, D. C., Greenhill, L. J., Fialkov, A. et al. (2017). Design and characterization of the Large-Aperture Experiment to Detect the Dark Age (LEDA) radiometer systems. arXiv:1709.09313.Google Scholar
Pritchard, J. R. & Furlanetto, S. R. (2007). 21-cm fluctuations from inhomogeneous X-ray heating before reionization. MNRAS, 367:1680–1694.Google Scholar