26 research outputs found
Exploring the cosmic microwave background as a composition of signals with Kolmogorov analysis
The problem of separation of different signals in the Cosmic Microwave
Background (CMB) radiation using the difference in their statistics is
analyzed. Considering samples of sequences which model the CMB as a
superposition of signals, we show how the Kolmogorov stochasticity parameter
acts as a relevant descriptor, either qualitatively or quantitatively, to
distinguish the statistical properties of the cosmological and secondary
signals.Comment: Mod. Phys. Lett. (in press), 13 pages, 7 figure
On the detection of point sources in Planck LFI 70 GHz CMB maps based on cleaned K-map
We use the Planck LFI 70GHz data to further probe point source detection
technique in the sky maps of the cosmic microwave background (CMB) radiation.
The method developed by Tegmark et al. for foreground reduced maps and the
Kolmogorov parameter as the descriptor are adopted for the analysis of Planck
satellite CMB temperature data. Most of the detected points coincide with point
sources already revealed by other methods. However, we have also found 9 source
candidates for which still no counterparts are known.Comment: 11 pages, 3 figures, Accepted for publication in Modern Physics
Letters A. arXiv admin note: substantial text overlap with arXiv:1206.712
Probing the statistic in the cosmic microwave background
Kolmogorov's statistic is used for the analysis of properties of
perturbations in the Cosmic Microwave Background signal. We obtain the maps of
the Kolmogorov stochasticity parameter for W and V band temperature data of
WMAP which are differently affected by the Galactic disk radiation and then we
model datasets with various statistic of perturbations. The analysis shows that
the Kolmogorov's parameter can be an efficient tool for the separation of
Cosmic Microwave Background from the contaminating radiations due to their
different statistical properties.Comment: 6 pages, 4 figure
To the center of cold spot with Planck
The structure of the cold spot, of a non-Gaussian anomaly in the cosmic
microwave background (CMB) sky first detected by Vielva et al. is studied using
the data by Planck satellite. The obtained map of the degree of stochasticity
(K-map) of CMB for the cold spot, reveals, most clearly in 100 GHz band, a
shell-type structure with a center coinciding with the minima of the
temperature distribution. The shell structure is non-Gaussian at a 4\sigma
confidence level. Such behavior of the K-map supports the void nature of the
cold spot. The applied method can be used for tracing voids that have no
signatures in redshift surveys.Comment: A & A (in press), 4 pages, 5 figures; to match the published versio
CMB Bispectrum from Active Models of Structure Formation
We propose a new method for the numerical computation of the angular bispectrum of the CMB anisotropies arising from active models such as cosmic topological defects, using a modified Boltzmann code. The method, similarly to CMBFAST, does not use CMB sky maps and requires moderate computational power. As a first implementation, we apply our method to a recently proposed model of simulated cosmic strings and find that the observability of the non-Gaussian signal is negligible
Planck's confirmation of the M31 disk and halo rotation
Planck's data acquired during the first 15.4 months of observations towards
both the disk and halo of the M31 galaxy are analyzed. We confirm the existence
of a temperature asymmetry, previously detected by using the 7-year WMAP data,
along the direction of the M31 rotation, therefore indicative of a
Doppler-induced effect. The asymmetry extends up to about 10 degrees (about 130
kpc) from the M31 center. We also investigate the recent issue raised in Rubin
and Loeb (2014) about the kinetic Sunyaev-Zeldovich effect from the diffuse hot
gas in the Local Group, predicted to generate a hot spot of a few degrees size
in the CMB maps in the direction of M31, where the free electron optical depth
gets the maximum value. We also consider the issue whether in the opposite
direction with respect to the M31 galaxy the same effect induces a minimum in
temperature in the Planck's maps of the sky. We find that the Planck's data at
100 GHz show an effect even larger than that expected.Comment: 4 pages, 1 table, 2 figures, in press as a Letter in A&
The power spectrum of the cosmic microwave background Kolmogorov maps: possible clue to correlation of voids
The power spectrum is obtained for the Kolmogorov stochasticity parameter map
for WMAP's cosmic microwave background (CMB) radiation temperature datasets.
The interest for CMB Kolmogorov map is that it can carry direct information
about voids in the matter distribution, so that the correlations in the
distribution of voids have to be reflected in the power spectrum. Although
limited by the angular resolution of the WMAP, this analysis shows the
possibility of acquiring this crucial information via CMB maps. Even the
already obtained behavior, some of which is absent in the simulated maps, can
influence the development of views on the void correlations at the large-scale
web formation.Comment: A & A (Lett.) (accepted), 4 pages, 3 fig
Kolmogorov cosmic microwave background sky
A new map of the sky representing the degree of randomness in the cosmic
microwave background (CMB) temperature has been obtained. The map based on
estimation of the Kolmogorov stochasticity parameter clearly distinguishes the
contribution of the Galactic disk from the CMB and reveals regions of various
degrees of randomness that can reflect the properties of inhomogeneities in the
Universe. For example, among the high randomness regions is the southern
non-Gaussian anomaly, the Cold Spot, with a stratification expected for the
voids. Existence of its counterpart, a Northern Cold Spot with almost identical
randomness properties among other low-temperature regions is revealed. By its
informative power, Kolmogorov's map can be complementary to the CMB temperature
and polarization sky maps.Comment: A & A (in press), to match the published version, 4 pages, 5 figs, 2
Table