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Title: Dipole of the Epoch of reionization 21-cm signal

Abstract

The motion of the Solar System with respect to the cosmic rest frame modulates the monopole of the epoch of reionization 21-cm signal into a dipole. This dipole has a characteristic frequency dependence that is dominated by the frequency derivative of the monopole signal. We argue that although the signal is weaker by a factor of ~100, there are significant benefits in measuring the dipole. Most importantly, the direction of the cosmic velocity vector is known exquisitely well from the cosmic microwave background and is not aligned with the galaxy velocity vector that modulates the foreground monopole. Furthermore, an experiment designed to measure a dipole can rely on differencing patches of the sky rather than making an absolute signal measurement, which helps with some systematic effects.

Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1368677
Alternate Identifier(s):
OSTI ID: 1351053
Report Number(s):
BNL-114019-2017-JA
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1702753
Grant/Contract Number:  
SC00112704; 16-038
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Slosar, Anze. Dipole of the Epoch of reionization 21-cm signal. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.151301.
Slosar, Anze. Dipole of the Epoch of reionization 21-cm signal. United States. doi:10.1103/PhysRevLett.118.151301.
Slosar, Anze. Mon . "Dipole of the Epoch of reionization 21-cm signal". United States. doi:10.1103/PhysRevLett.118.151301. https://www.osti.gov/servlets/purl/1368677.
@article{osti_1368677,
title = {Dipole of the Epoch of reionization 21-cm signal},
author = {Slosar, Anze},
abstractNote = {The motion of the Solar System with respect to the cosmic rest frame modulates the monopole of the epoch of reionization 21-cm signal into a dipole. This dipole has a characteristic frequency dependence that is dominated by the frequency derivative of the monopole signal. We argue that although the signal is weaker by a factor of ~100, there are significant benefits in measuring the dipole. Most importantly, the direction of the cosmic velocity vector is known exquisitely well from the cosmic microwave background and is not aligned with the galaxy velocity vector that modulates the foreground monopole. Furthermore, an experiment designed to measure a dipole can rely on differencing patches of the sky rather than making an absolute signal measurement, which helps with some systematic effects.},
doi = {10.1103/PhysRevLett.118.151301},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 15,
volume = 118,
place = {United States},
year = {2017},
month = {4}
}

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Works referenced in this record:

The Precision Array for Probing the Epoch of Re-Ionization: Eight Station Results
journal, March 2010


On the excitation mechanism of the 21-cm (radio-frequency) interstellar hydrogen emission line.
journal, January 1952

  • Wouthuysen, S. A.
  • The Astronomical Journal, Vol. 57
  • DOI: 10.1086/106661

Reionization and Cosmology with 21-cm Fluctuations
journal, August 2010


The LWA1 Radio Telescope
journal, May 2013

  • Ellingson, S. W.; Taylor, G. B.; Craig, J.
  • IEEE Transactions on Antennas and Propagation, Vol. 61, Issue 5
  • DOI: 10.1109/TAP.2013.2242826

21 cm cosmology in the 21st century
journal, July 2012


Excitation of the Hydrogen 21-CM Line
journal, January 1958


A simulation-calibrated limit on the H i power spectrum from the GMRT Epoch of Reionization experiment
journal, May 2013

  • Paciga, Gregory; Albert, Joshua G.; Bandura, Kevin
  • Monthly Notices of the Royal Astronomical Society, Vol. 433, Issue 1
  • DOI: 10.1093/mnras/stt753

A model of diffuse Galactic radio emission from 10 MHz to 100 GHz
journal, July 2008

  • de Oliveira-Costa, Anglica; Tegmark, Max; Gaensler, B. M.
  • Monthly Notices of the Royal Astronomical Society, Vol. 388, Issue 1
  • DOI: 10.1111/j.1365-2966.2008.13376.x

Cosmology at low frequencies: The 21cm transition and the high-redshift Universe
journal, October 2006


Global 21 cm signal experiments: A designer’s guide
journal, February 2013


CALIBRATION OF THE EDGES HIGH-BAND RECEIVER TO OBSERVE THE GLOBAL 21 cm SIGNATURE FROM THE EPOCH OF REIONIZATION
journal, January 2017

  • Monsalve, Raul A.; Rogers, Alan E. E.; Bowman, Judd D.
  • The Astrophysical Journal, Vol. 835, Issue 1
  • DOI: 10.3847/1538-4357/835/1/49

ERASING THE VARIABLE: EMPIRICAL FOREGROUND DISCOVERY FOR GLOBAL 21 cm SPECTRUM EXPERIMENTS
journal, September 2014


Eliminating the optical depth nuisance from the CMB with 21 cm cosmology
journal, February 2016


Constraining the unexplored period between the dark ages and reionization with observations of the global 21 cm signal
journal, July 2010