Revisiting the nvss number count dipole

Prabhakar Tiwari; Adi Nusser

doi:10.1088/1475-7516/2016/03/062

Revisiting the nvss number count dipole

Prabhakar Tiwari, Adi Nusser

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

We present a realistic modeling of the dipole component of the 0projected sky distribution of NVSS radio galaxies. The modeling relies on mock catalogs generated within the context of ?CDM cosmology, in the linear regime of structure formation. After removing the contribution from the solar motion, the mocks show that the remaining observed signal is mostly (70%) due to structures within z . 0:1. The amplitude of the model signal depends on the bias factor b of the NVSS mock galaxies. For sources with flux density, S > 15 mJy, the bias recipe inferred from higher order moments is consistent with the observed dipole signal at 2:12s. Flux thresholds above 20 mJy yield a disagreement close to the 3s level. A constant high bias, b = 3 is needed to mitigate the tension to the ∼ 2:3s level.

Original language	English
Article number	062
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2016
Issue number	3
DOIs	https://doi.org/10.1088/1475-7516/2016/03/062
State	Published - 2016
Externally published	Yes

Keywords

Cosmological simulations
Galaxy clustering
High redshift galaxies

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10.1088/1475-7516/2016/03/062

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abstract = "We present a realistic modeling of the dipole component of the 0projected sky distribution of NVSS radio galaxies. The modeling relies on mock catalogs generated within the context of ?CDM cosmology, in the linear regime of structure formation. After removing the contribution from the solar motion, the mocks show that the remaining observed signal is mostly (70%) due to structures within z . 0:1. The amplitude of the model signal depends on the bias factor b of the NVSS mock galaxies. For sources with flux density, S > 15 mJy, the bias recipe inferred from higher order moments is consistent with the observed dipole signal at 2:12s. Flux thresholds above 20 mJy yield a disagreement close to the 3s level. A constant high bias, b = 3 is needed to mitigate the tension to the ∼ 2:3s level.",

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AB - We present a realistic modeling of the dipole component of the 0projected sky distribution of NVSS radio galaxies. The modeling relies on mock catalogs generated within the context of ?CDM cosmology, in the linear regime of structure formation. After removing the contribution from the solar motion, the mocks show that the remaining observed signal is mostly (70%) due to structures within z . 0:1. The amplitude of the model signal depends on the bias factor b of the NVSS mock galaxies. For sources with flux density, S > 15 mJy, the bias recipe inferred from higher order moments is consistent with the observed dipole signal at 2:12s. Flux thresholds above 20 mJy yield a disagreement close to the 3s level. A constant high bias, b = 3 is needed to mitigate the tension to the ∼ 2:3s level.

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JO - Journal of Cosmology and Astroparticle Physics

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Revisiting the nvss number count dipole

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