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Title: Revisiting the NVSS number count dipole

Abstract

We present a realistic modeling of the dipole component of the projected sky distribution of NVSS radio galaxies. The modeling relies on mock catalogs generated within the context of ΛCDM 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 2.12σ. Flux thresholds above 20 mJy yield a disagreement close to the 3σ level. A constant high bias, b = 3 is needed to mitigate the tension to the ∼ 2.3σ level.

Authors:
;  [1]
  1. Physics Department, Technion - Israel Institute of Technology, Technion City, Haifa 3200003 (Israel)
Publication Date:
OSTI Identifier:
22524907
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2016; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; CATALOGS; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; COSMOLOGY; DIPOLES; FLUX DENSITY; RADIO GALAXIES; SIGNALS; SKY

Citation Formats

Tiwari, Prabhakar, and Nusser, Adi. Revisiting the NVSS number count dipole. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/03/062.
Tiwari, Prabhakar, & Nusser, Adi. Revisiting the NVSS number count dipole. United States. https://doi.org/10.1088/1475-7516/2016/03/062
Tiwari, Prabhakar, and Nusser, Adi. 2016. "Revisiting the NVSS number count dipole". United States. https://doi.org/10.1088/1475-7516/2016/03/062.
@article{osti_22524907,
title = {Revisiting the NVSS number count dipole},
author = {Tiwari, Prabhakar and Nusser, Adi},
abstractNote = {We present a realistic modeling of the dipole component of the projected sky distribution of NVSS radio galaxies. The modeling relies on mock catalogs generated within the context of ΛCDM 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 2.12σ. Flux thresholds above 20 mJy yield a disagreement close to the 3σ level. A constant high bias, b = 3 is needed to mitigate the tension to the ∼ 2.3σ level.},
doi = {10.1088/1475-7516/2016/03/062},
url = {https://www.osti.gov/biblio/22524907}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2016,
place = {United States},
year = {2016},
month = {3}
}