Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Hansen, Frode K."'
Autor:
Toscano, Facundo, Hansen, Frode K., Lambas, Diego Garcia, Luparello, Heliana, Fosalba, Pablo, Gaztañaga, Enrique
We perform cosmological parameters estimation on Planck Cosmic Microwave Background (CMB) maps masking the recently discovered foreground related to nearby spiral galaxies. In addition, we also analyse the association between these foreground regions
Externí odkaz:
http://arxiv.org/abs/2410.24026
Autor:
Lambas, Diego Garcia, Hansen, Frode K., Toscano, Facundo, Luparello, Heliana E., Boero, Ezequiel F.
Publikováno v:
A&A 681, A2 (2024)
The non-Gaussian Cold Spot (CS) surrounded by its hot ring is one of the most striking features of the CMB. It has been speculated that either new physics or ISW effect induced by the presence of a cosmic void at high redshift can account for the obs
Externí odkaz:
http://arxiv.org/abs/2310.13755
In Luparello et al. 2023, a new and hitherto unknown CMB foreground was detected. A systematic decrease in Cosmic Microwave Background (CMB) temperatures around nearby large spiral galaxies points to an unknown interaction with CMB photons in a spher
Externí odkaz:
http://arxiv.org/abs/2305.00268
Autor:
Durastanti, Claudio, Fantaye, Yabebal T., Hansen, Frode K., Marinucci, Domenico, Pesenson, Isaac Z.
Publikováno v:
Phys. Rev. D 90, 103532 (2014)
We present here a simple construction of a wavelet system for the three-dimensional ball, which we label \emph{Radial 3D Needlets}. The construction envisages a data collection environment where an observer located at the centre of the ball is surrou
Externí odkaz:
http://arxiv.org/abs/1408.1095
Autor:
Berntsen, Eirik, Hansen, Frode K.
We investigate claims of excess ellipticity of hot and cold spots in the WMAP data (Gurzadyan et al. 2005, 2007). Using the cosmic microwave background data from 7 years of observations by the WMAP satellite, we find, contrary to previous claims of a
Externí odkaz:
http://arxiv.org/abs/1211.5275
Autor:
Scodeller, Sandro, Hansen, Frode K.
Publikováno v:
2012, ApJ, 761, 119
In (Scodeller et al.) a new and extended point source catalogue obtained from the WMAP 7-year data was presented. It includes most of the sources included in the standard WMAP 7-year point source catalogues as well as a large number of new detections
Externí odkaz:
http://arxiv.org/abs/1207.2315
Publikováno v:
Astrophysical Journal 755 (2012) 19
We derive the linear correction term for needlet and wavelet estimators of the bispectrum and the non-linearity parameter fNL on cosmic microwave background radiation data. We show that on masked WMAP-like data with anisotropic noise, the error bars
Externí odkaz:
http://arxiv.org/abs/1202.1478
Publikováno v:
2012, ApJ, 753, 27
We have developed a new needlet based method to detect point sources in cosmic microwave background (CMB) maps and have applied it to the WMAP 7 year data. We use both the individual frequency channels as well as internal templates, the difference be
Externí odkaz:
http://arxiv.org/abs/1201.5852
We test anisotropic dark energy models with the 7-year WMAP temperature observations data. In the presence of imperfect sources, due to large-scale gradients or anisotropies in the dark energy field, the CMB sky will be distorted anisotropically on i
Externí odkaz:
http://arxiv.org/abs/1109.2778
Using the 5 year WMAP data, we re-investigate claims of non-Gaussianities and asymmetries detected in local curvature statistics of the 1 year WMAP data. In Hansen et al 2004, it was found that the northern ecliptic hemisphere was non-Gaussian at the
Externí odkaz:
http://arxiv.org/abs/1002.1811