نتایج جستجو برای: angular power spectrum aps
تعداد نتایج: 760576 فیلتر نتایج به سال:
We have analysed the angular power spectra of the Parkes radio continuum and polarisation survey of the Southern galactic plane at 2.4 GHz. We have found that in the multipole range l = 40–250 the angular power spectrum of the polarised intensity is well described by a power-law spectrum with fitted spectral index αL = 2.37 ± 0.21. In the same multipole range the angular power spectra of the E ...
We address the question of whether the angular power spectrum of the thermal Sunyaev-Zel’dovich (SZ) sky is further distorted by weak gravitational lensing of foreground large-scale structures. Using an analytic approach to both gaseous and dark halo models, we show that the contamination of weak lensing in the measurement of SZ power power is negligibly small, and relatively corrections |∆Cl|/...
This thesis describes an investigation of certain aspects of laser light beam propagation in a simulated ocean environment. The specific parameter of interest here is the angular spectrum, or angular distribution, of the received optical power after it traverses the underwater medium. Knowledge of the angular spectrum width is required by the communication engineer in order to specify the field...
A novel geometry-based channel model (GCM) for lineof-sight (LoS) microcell scenario in dense urban areas is proposed. The proposed two dimensional scattering power distribution (SPD) is postulated on the physical phenomenon is obtained. The implementation issues are discussed and the delay-power spectrum (DPS) and azimuthpower spectrum (APS) derived from the proposed model are compared to thos...
We provide a simple toy model to elucidate the effects of baryonic cooling on predictions of the convergence power spectrum in weak gravitational lensing. Our model suggests that the effects of baryonic cooling on dark matter halo profiles can alter the dark matter power spectrum at k ∼ 10hMpc and lead to percent level changes in the convergence angular power spectrum at wavenumbers of several ...
We describe the angular power spectrum of resolved sources at 3.6 μm (L-band) in Spitzer imaging data of the GOODS HDF-N, the GOODS CDF-S, and the NDWFS Boötes field in several source magnitude bins. We also measure angular power spectra of resolved sources in the Boötes field at KS and J-bands using ground-based IR imaging data. In the three bands, J, KS, and L, we detect the clustering of gal...
The advent of high signal-to-noise cosmic microwave background (CMB) anisotropy experiments now allow detailed studies on the statistics related to temperature fluctuations. The existence of acoustic oscillations in the anisotropy power spectrum is now established with the clear detection of the first, and to a lesser confidence the second and the third, peak. Beyond the acoustic peak structure...
We present measurements of the angular power spectrum of millimeter wave anisotropies with the APEX-SZ instrument. APEX-SZ has mapped 0.8 square degrees of sky at a frequency of 150 GHz with an angular resolution of 1′. These new measurements significantly improve the constraints on anisotropy power at 150 GHz over the range of angular multipoles 3000 < ` < 10, 000, limiting the total astronomi...
Precise measurements of the anisotropies in the cosmic microwave background enable us to do an accurate study on the form of the primordial power spectrum for a given set of cosmological parameters. In a previous paper [1], we implemented an improved (error sensitive) Richardson-Lucy deconvolution algorithm on the measured angular power spectrum from the first year of WMAP data to determine the...
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