Large angular scale multipoles at redshift ~0.8. (arXiv:1812.04739v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Tiwari_P/0/1/0/all/0/1">Prabhakar Tiwari</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Aluri_P/0/1/0/all/0/1">Pavan K. Aluri</a>
We prepare the full sky radio galaxy map ($|b|>10^{circ}$) using the north
NVSS and south SUMSS galaxy catalogs and study the large scale multipoles
anomalies. These galaxies are roughly at redshift $z sim 0.8$ and therefore
tracing the matter distribution at very large scales. The quadruple and
octopole from radio galaxy catalog are consistent with $Lambda$CDM for a
reasonable value of galaxy bias and we do not find dipole–quadruple–octopole
alignment as seen in CMB temperature maps. The quadrupole direction is roughly
$46^{circ}$ away from dipole, and octopole direction is approximately
$33^{circ}$ from dipole. The angle between quadrupole and octopole is around
$70^circ$ degree. We have large errors in multipole directions due to shot
noise, even so with this data we are able to rule out dipole–quadruple and
quadruple–octopole alignment. The magnitude of all multipoles, except dipole,
are roughly consistent with $Lambda$CDM for reasonable galaxy bias. The dipole
magnitude remains inconsistent with CMB as reported in previous studies. The
results may impose stringent constraints on cosmological models with large
scale anisotropy features.
We prepare the full sky radio galaxy map ($|b|>10^{circ}$) using the north
NVSS and south SUMSS galaxy catalogs and study the large scale multipoles
anomalies. These galaxies are roughly at redshift $z sim 0.8$ and therefore
tracing the matter distribution at very large scales. The quadruple and
octopole from radio galaxy catalog are consistent with $Lambda$CDM for a
reasonable value of galaxy bias and we do not find dipole–quadruple–octopole
alignment as seen in CMB temperature maps. The quadrupole direction is roughly
$46^{circ}$ away from dipole, and octopole direction is approximately
$33^{circ}$ from dipole. The angle between quadrupole and octopole is around
$70^circ$ degree. We have large errors in multipole directions due to shot
noise, even so with this data we are able to rule out dipole–quadruple and
quadruple–octopole alignment. The magnitude of all multipoles, except dipole,
are roughly consistent with $Lambda$CDM for reasonable galaxy bias. The dipole
magnitude remains inconsistent with CMB as reported in previous studies. The
results may impose stringent constraints on cosmological models with large
scale anisotropy features.
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