First results on the Epoch of Reionization from First Light with SARAS 2 - INSPIRE

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First results on the Epoch of Reionization from First Light with SARAS 2

Mar 20, 2017

6 pages

Published in:

Astrophys.J.Lett. 845 (2017) 2, L12

Published: Aug 14, 2017

e-Print:

1703.06647 [astro-ph.CO]

DOI:

10.3847/2041-8213/aa831b

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Abstract: (IOP)

Long-wavelength spectral distortions in the cosmic microwave background arising from the 21 cm transition in neutral hydrogen are a key probe of the Cosmic Dawn and the Epoch of Reionization. These features may reveal the nature of the first stars and ultra-faint galaxies that transformed the spin temperature and ionization state of the primordial gas. SARAS 2 is a spectral radiometer purposely designed for the precision measurement of these monopole or all-sky global 21 cm spectral distortions. We use 63 hr nighttime observations of the radio background in the frequency band 110–200 MHz, with the radiometer deployed at the Timbaktu Collective in Southern India, to derive likelihoods for plausible redshifted 21 cm signals predicted by theoretical models. First light with SARAS 2 disfavors the class of models that feature weak X-ray heating (with

{f}_{X}\leqslant 0.1

) and rapid reionization (with peak

\tfrac{{{dT}}_{b}}{{dz}}\geqslant 120

mK per unit redshift interval).

Note:

6 pages, 5 figures, accepted for publication in ApJ Letters

cosmic background radiation
cosmology: observations
dark ages, reionization, first stars
methods: observational

References(48)

Figures(6)

The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology

Rennan Barkana

- Phys.Rept. 645 (2016) 1-59
•
e-Print:
- 1605.04357
•
DOI:
- 10.1016/j.physrep.2016.06.006

In the beginning: The First sources of light and the reionization of the Universe

- Phys.Rept. 349 (2001) 125-238
•
e-Print:
- astro-ph/0010468
•
DOI:
- 10.1016/S0370-1573(01)00019-9

First Season MWA EoR Power Spectrum Results at Redshift 7

A.P. Beardsley
(
- Arizona State U. and
- Washington U., Seattle
)
,
B.J. Hazelton
(
- Washington U., Seattle
)
,
I.S. Sullivan
(
- Washington U., Seattle
)
,
P. Carroll
(
- Washington U., Seattle
)
,
N. Barry
(
- Washington U., Seattle
)

et al.

- Astrophys.J. 833 (2016) 1, 102
•
e-Print:
- 1608.06281
•
DOI:
- 10.3847/1538-4357/833/1/102

Foreground Model and Antenna Calibration Errors in the Measurement of the Sky-Averaged \lambda 21 cm Signal at z~20

- Astrophys.J. 799 (2015) 1, 90
•
e-Print:
- 1404.0887
•
DOI:
- 10.1088/0004-637X/799/1/90

Bayesian constraints on the global 21-cm signal from the Cosmic Dawn

et al.

- Mon.Not.Roy.Astron.Soc. 461 (2016) 3, 2847-2855
•
e-Print:
- 1606.06006
•
DOI:
- 10.1093/mnras/stw1499

A lower limit of dz > 0.06 for the duration of the reionization epoch

- Nature 468 (2010) 796-798
•
e-Print:
- 1209.1117
•
DOI:
- 10.1038/nature09601

The First cosmic structures and their effects

- Space Sci.Rev. 116 (2005) 625-705
•
e-Print:
- astro-ph/0409018
•
DOI:
- 10.1007/s11214-005-3592-0

Charting the Parameter Space of the Global 21-cm Signal

Aviad Cohen
(
- Tel Aviv U.
)
,
Anastasia Fialkov
(
- Harvard-Smithsonian Ctr. Astrophys.
)
,
Rennan Barkana
(
- Tel Aviv U. and
- Paris, Inst. Astrophys. and
- Oxford U. and
- Perimeter Inst. Theor. Phys.
)
,
Matan Lotem
(
- Tel Aviv U.
)

- Mon.Not.Roy.Astron.Soc. 472 (2017) 2, 1915-1931
•
e-Print:
- 1609.02312
•
DOI:
- 10.1093/mnras/stx2065

Observational constraints on cosmic reionization

- Ann.Rev.Astron.Astrophys. 44 (2006) 415-462
•
e-Print:
- astro-ph/0602375
•
DOI:
- 10.1146/annurev.astro.44.051905.092514

The observable signature of late heating of the Universe during cosmic reionization

Anastasia Fialkov
(
- Tel Aviv U. and
- Ecole Normale Superieure, Paris
)
,
Rennan Barkana
(
- Tel Aviv U.
)
,
Eli Visbal
(
- Columbia U. and
- Harvard U.
)

- Nature 506 (2014) 197
•
e-Print:
- 1402.0940
•
DOI:
- 10.1038/nature12999

Excitation of the Hydrogen 21-CM Line

George B. Field

- IEEE Proc. 46 (1958) 1, 240-250
•
DOI:
- 10.1109/JRPROC.1958.286741

The Global 21 Centimeter Background from High Redshifts

Steven Furlanetto
(
- Yale U., Dept. Astron.
)

- Mon.Not.Roy.Astron.Soc. 371 (2006) 867-878
•
e-Print:
- astro-ph/0604040
•
DOI:
- 10.1111/j.1365-2966.2006.10725.x

Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe

- Phys.Rept. 433 (2006) 181-301
•
e-Print:
- astro-ph/0608032
•
DOI:
- 10.1016/j.physrep.2006.08.002

Cosmic Reionization and the First Nonlinear Structures in the Universe (Cham: International) 1

Haiman Z.

Crossref:

Hampel F. R.

- J.Am.Statist.Assoc. 69 (1974) 383
•
DOI:
- 10.1080/01621459.1974.10482962

Selection between foreground models for global 21-cm experiments

Geraint Harker

- Mon.Not.Roy.Astron.Soc. 449 (2015) 1, L21-L25
•
e-Print:
- 1501.05182
•
DOI:
- 10.1093/mnrasl/slv011

Parametrizations of the 21-cm global signal and parameter estimation from single-dipole experiments

- Mon.Not.Roy.Astron.Soc. 455 (2016) 4, 3829-3840
•
e-Print:
- 1510.00271
•
DOI:
- 10.1093/mnras/stv2630

Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results

WMAP

Collaboration

•

G. Hinshaw
(
- British Columbia U.
)

et al.

- Astrophys.J.Suppl. 208 (2013) 19
•
e-Print:
- 1212.5226
•
DOI:
- 10.1088/0067-0049/208/2/19

Fundamentals of Statistical Signal Processing, Vol. II: Detection Theory (Englewood Cliffs, NJ:

Kay S. M.

Global 21 cm signal experiments: A designer’s guide

Adrian Liu
(
- UC, Berkeley, Astron. Dept. and
- BCCP, Berkeley
)
,
Jonathan R. Pritchard
(
- Imperial Coll., London
)
,
Max Tegmark
(
- MIT, Cambridge, Dept. Phys. and
- MIT, MKI
)
,
Abraham Loeb
(
- Harvard U.
)

- Phys.Rev.D 87 (2013) 4, 043002
•
e-Print:
- 1211.3743
•
DOI:
- 10.1103/PhysRevD.87.043002

How well can we measure and understand foregrounds with 21 cm experiments?

- Mon.Not.Roy.Astron.Soc. 419 (2012) 3491-3504
•
e-Print:
- 1106.0007
•
DOI:
- 10.1111/j.1365-2966.2011.19989.x

Radiation Backgrounds at Cosmic Dawn: X-Rays from Compact Binaries

Piero Madau
(
)
,
Tassos Fragos
(
- Geneva Observ.
)

- Astrophys.J. 840 (2017) 1, 39
•
e-Print:
- 1606.07887
•
DOI:
- 10.3847/1538-4357/aa6af9

21-CM tomography of the intergalactic medium at high redshift

- Astrophys.J. 475 (1997) 429
•
e-Print:
- astro-ph/9608010
•
DOI:
- 10.1086/303549

Model-independent evidence in favour of an end to reionization by $z \approx$ 6

- Mon.Not.Roy.Astron.Soc. 447 (2015) 1, 499-505
•
e-Print:
- 1411.5375
•
DOI:
- 10.1093/mnras/stu2449

The Evolution of the Intergalactic Medium

Matthew McQuinn

- Ann.Rev.Astron.Astrophys. 54 (2016) 313-362
•
e-Print:
- 1512.00086
•
DOI:
- 10.1146/annurev-astro-082214-122355

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