Impact of local structure on the cosmic radio dipole

Rubart M, Bacon D, Schwarz D (2014)
Astronomy & Astrophysics 565: A111.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
We investigate the contribution that a local over- or under-density can haveon linear cosmic dipole estimations. We focus here on radio surveys, such asthe NRAO VLA Sky Survey (NVSS), and forthcoming surveys such as those with theLOw Frequency ARray (LOFAR), the Australian Square Kilometre Array Pathfinder(ASKAP) and the Square Kilometre Array (SKA). The NVSS has already been used toestimate the cosmic radio dipole; it was shown recently that this radio dipoleamplitude is larger than expected from a purely kinematic effect, assuming thevelocity inferred from the dipole of the cosmic microwave background. We showhere that a significant contribution to this excess could come from a localvoid or similar structure. In contrast to the kinetic contribution to the radiodipole, the structure dipole depends on the flux threshold of the survey andthe wave band, which opens the chance to distinguish the two contributions.
Erscheinungsjahr
2014
Zeitschriftentitel
Astronomy & Astrophysics
Band
565
Seite(n)
A111
ISSN
0004-6361
eISSN
1432-0746
Page URI
https://pub.uni-bielefeld.de/record/2657957

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Rubart M, Bacon D, Schwarz D. Impact of local structure on the cosmic radio dipole. Astronomy & Astrophysics. 2014;565:A111.
Rubart, M., Bacon, D., & Schwarz, D. (2014). Impact of local structure on the cosmic radio dipole. Astronomy & Astrophysics, 565, A111. doi:10.1051/0004-6361/201423583
Rubart, M., Bacon, D., and Schwarz, D. (2014). Impact of local structure on the cosmic radio dipole. Astronomy & Astrophysics 565, A111.
Rubart, M., Bacon, D., & Schwarz, D., 2014. Impact of local structure on the cosmic radio dipole. Astronomy & Astrophysics, 565, p A111.
M. Rubart, D. Bacon, and D. Schwarz, “Impact of local structure on the cosmic radio dipole”, Astronomy & Astrophysics, vol. 565, 2014, pp. A111.
Rubart, M., Bacon, D., Schwarz, D.: Impact of local structure on the cosmic radio dipole. Astronomy & Astrophysics. 565, A111 (2014).
Rubart, Matthias, Bacon, David, and Schwarz, Dominik. “Impact of local structure on the cosmic radio dipole”. Astronomy & Astrophysics 565 (2014): A111.

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arXiv: 1402.0376

Inspire: 1279887

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