Testing the standard model of cosmology with the SKA: the cosmic radio dipole

Bengaly CAP, Siewert T, Schwarz D, Maartens R (2019)
Monthly Notices of the Royal Astronomical Society 486(1): 1350-1357.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor/in
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Abstract / Bemerkung
The dipole anisotropy seen in the cosmic microwave background (CMB) radiation is interpreted as due to our peculiar motion. The cosmological principle implies that this cosmic dipole signal should also be present, with the same direction, in the large-scale distribution of matter. Measurement of the cosmic matter dipole constitutes a key test of the standard cosmological model. Current measurements of this dipole are barely above the expected noise and unable to provide a robust test. Upcoming radio continuum surveys with the SKA should be able to detect the dipole at high signal to noise. We simulate number count maps for SKA survey specifications in Phases 1 and 2, including all relevant effects. Non-linear effects from local large-scale structure contaminate the cosmic (kinematic) dipole signal, and we find that removal of radio sources at low redshift (z less than or similar to 0.5) leads to significantly improved constraints. We forecast that the SKA could determine the kinematic dipole direction in Galactic coordinates with an error of (Delta l, Delta b) similar to (9 degrees, 5 degrees) to (8 degrees, 4 degrees), depending on the sensitivity. The predicted errors on the relative speed are similar to 10 per cent. These measurements would significantly reduce the present uncertainty on the direction of the radio dipole, and thus enable the first critical test of consistency between the matter and CMB dipoles.
Stichworte
cosmology: observations; cosmology: theory; large-scale structure of; Universe
Erscheinungsjahr
2019
Zeitschriftentitel
Monthly Notices of the Royal Astronomical Society
Band
486
Ausgabe
1
Seite(n)
1350-1357
ISSN
0035-8711
eISSN
1365-2966
Page URI
https://pub.uni-bielefeld.de/record/2936958

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Bengaly CAP, Siewert T, Schwarz D, Maartens R. Testing the standard model of cosmology with the SKA: the cosmic radio dipole. Monthly Notices of the Royal Astronomical Society. 2019;486(1):1350-1357.
Bengaly, C. A. P., Siewert, T., Schwarz, D., & Maartens, R. (2019). Testing the standard model of cosmology with the SKA: the cosmic radio dipole. Monthly Notices of the Royal Astronomical Society, 486(1), 1350-1357. doi:10.1093/mnras/stz832
Bengaly, C. A. P., Siewert, T., Schwarz, D., and Maartens, R. (2019). Testing the standard model of cosmology with the SKA: the cosmic radio dipole. Monthly Notices of the Royal Astronomical Society 486, 1350-1357.
Bengaly, C.A.P., et al., 2019. Testing the standard model of cosmology with the SKA: the cosmic radio dipole. Monthly Notices of the Royal Astronomical Society, 486(1), p 1350-1357.
C.A.P. Bengaly, et al., “Testing the standard model of cosmology with the SKA: the cosmic radio dipole”, Monthly Notices of the Royal Astronomical Society, vol. 486, 2019, pp. 1350-1357.
Bengaly, C.A.P., Siewert, T., Schwarz, D., Maartens, R.: Testing the standard model of cosmology with the SKA: the cosmic radio dipole. Monthly Notices of the Royal Astronomical Society. 486, 1350-1357 (2019).
Bengaly, C. A. P., Siewert, Thilo, Schwarz, Dominik, and Maartens, R. “Testing the standard model of cosmology with the SKA: the cosmic radio dipole”. Monthly Notices of the Royal Astronomical Society 486.1 (2019): 1350-1357.