Is the Radio Source Dipole from NVSS Consistent with the CMB and
$Łambda$CDM?
Y. Cheng, T. Chang, und A. Lidz. (2023)cite arxiv:2309.02490Comment: 24 pages, 9 figures, submitted to ApJ.
Zusammenfassung
The dipole moment in the angular distribution of the cosmic microwave
background (CMB) is thought to originate from the Doppler Effect and our motion
relative to the CMB frame. Observations of large-scale structure (LSS) should
show a related "kinematic dipole" and help test the kinematic origin of the CMB
dipole. Intriguingly, many previous LSS dipole studies suggest discrepancies
with the expectations from the CMB. Here we reassess the apparent inconsistency
between the CMB measurements and dipole estimates from the NVSS catalog of
radio sources. We find that it is important to account for the shot-noise and
clustering of the NVSS sources, as well as kinematic contributions, in
determining the expected dipole signal. We use the clustering redshift method
and a cross-matching technique to refine estimates of the clustering term. We
then derive a probability distribution for the expected NVSS dipole in a
standard $Łambda$CDM cosmological model including all (i.e., kinematic,
shot-noise and clustering) dipole components. Our model agrees with most of the
previous NVSS dipole measurements in the literature at better than $łesssim
2\sigma$. We conclude that the NVSS dipole is consistent with a kinematic
origin for the CMB dipole within $Łambda$CDM.
Beschreibung
Is the Radio Source Dipole from NVSS Consistent with the CMB and $\Lambda$CDM?
%0 Generic
%1 cheng2023radio
%A Cheng, Yun-Ting
%A Chang, Tzu-Ching
%A Lidz, Adam
%D 2023
%K tifr
%T Is the Radio Source Dipole from NVSS Consistent with the CMB and
$Łambda$CDM?
%U http://arxiv.org/abs/2309.02490
%X The dipole moment in the angular distribution of the cosmic microwave
background (CMB) is thought to originate from the Doppler Effect and our motion
relative to the CMB frame. Observations of large-scale structure (LSS) should
show a related "kinematic dipole" and help test the kinematic origin of the CMB
dipole. Intriguingly, many previous LSS dipole studies suggest discrepancies
with the expectations from the CMB. Here we reassess the apparent inconsistency
between the CMB measurements and dipole estimates from the NVSS catalog of
radio sources. We find that it is important to account for the shot-noise and
clustering of the NVSS sources, as well as kinematic contributions, in
determining the expected dipole signal. We use the clustering redshift method
and a cross-matching technique to refine estimates of the clustering term. We
then derive a probability distribution for the expected NVSS dipole in a
standard $Łambda$CDM cosmological model including all (i.e., kinematic,
shot-noise and clustering) dipole components. Our model agrees with most of the
previous NVSS dipole measurements in the literature at better than $łesssim
2\sigma$. We conclude that the NVSS dipole is consistent with a kinematic
origin for the CMB dipole within $Łambda$CDM.
@misc{cheng2023radio,
abstract = {The dipole moment in the angular distribution of the cosmic microwave
background (CMB) is thought to originate from the Doppler Effect and our motion
relative to the CMB frame. Observations of large-scale structure (LSS) should
show a related "kinematic dipole" and help test the kinematic origin of the CMB
dipole. Intriguingly, many previous LSS dipole studies suggest discrepancies
with the expectations from the CMB. Here we reassess the apparent inconsistency
between the CMB measurements and dipole estimates from the NVSS catalog of
radio sources. We find that it is important to account for the shot-noise and
clustering of the NVSS sources, as well as kinematic contributions, in
determining the expected dipole signal. We use the clustering redshift method
and a cross-matching technique to refine estimates of the clustering term. We
then derive a probability distribution for the expected NVSS dipole in a
standard $\Lambda$CDM cosmological model including all (i.e., kinematic,
shot-noise and clustering) dipole components. Our model agrees with most of the
previous NVSS dipole measurements in the literature at better than $\lesssim
2\sigma$. We conclude that the NVSS dipole is consistent with a kinematic
origin for the CMB dipole within $\Lambda$CDM.},
added-at = {2023-09-07T06:51:07.000+0200},
author = {Cheng, Yun-Ting and Chang, Tzu-Ching and Lidz, Adam},
biburl = {https://www.bibsonomy.org/bibtex/2de01ab7e134f824b3efbae43f2ea2245/citekhatri},
description = {Is the Radio Source Dipole from NVSS Consistent with the CMB and $\Lambda$CDM?},
interhash = {debdb7c9e09b5409d7890bd934d88405},
intrahash = {de01ab7e134f824b3efbae43f2ea2245},
keywords = {tifr},
note = {cite arxiv:2309.02490Comment: 24 pages, 9 figures, submitted to ApJ},
timestamp = {2023-09-07T06:51:07.000+0200},
title = {Is the Radio Source Dipole from NVSS Consistent with the CMB and
$\Lambda$CDM?},
url = {http://arxiv.org/abs/2309.02490},
year = 2023
}