A new formulation of the Type Ia supernova rate and its consequences on galactic chemical evolution     

F. Matteucci  N. Panagia  A. Pipino  F. Mannucci  S. Recchi  M. Della Valle 《Monthly notices of the Royal Astronomical Society》2006,372(1):265-275

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The properties of extragalactic radio sources selected at 20 GHz     

Elaine M. Sadler  Roberto Ricci  Ronald D. Ekers  J. A. Ekers  Paul J. Hancock  Carole A. Jackson  Michael J. Kesteven  Tara Murphy  Chris Phillips  Robert F. Reinfrank  Lister Staveley-Smith  Ravi Subrahmanyan  Mark A. Walker  Warwick E. Wilson  Gianfranco De Zotti 《Monthly notices of the Royal Astronomical Society》2006,371(2):898-914

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The Cosmic Foreground Explorer (COFE): A balloon-borne microwave polarimeter to characterize polarized foregrounds     

Rodrigo Leonardi  Brian Williams  Marco Bersanelli  Ivan Ferreira  Philip M. Lubin  Peter R. Meinhold  Hugh O&#x;Neill  Nathan C. Stebor  Fabrizio Villa  Thyrso Villela  Carlos A. Wuensche 《New Astronomy Reviews》2006,50(11-12):977

The COsmic Foreground Explorer (COFE) is a balloon-borne microwave polarimeter designed to measure the low-frequency and low-ℓ characteristics of dominant diffuse polarized foregrounds. Short duration balloon flights from the Northern and Southern Hemispheres will allow the telescope to cover up to 80% of the sky with an expected sensitivity per pixel better than 100 μK/deg² from 10 GHz to 20 GHz. This is an important effort toward characterizing the polarized foregrounds for future CMB experiments, in particular the ones that aim to detect primordial gravity wave signatures in the CMB polarization angular power spectrum.  相似文献   

All-sky component separation for the Planck mission     

V. Stolyarov  M. P. Hobson  M. A. J. Ashdown  A. N. Lasenby 《Monthly notices of the Royal Astronomical Society》2002,336(1):97-111

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The impact of an extra background of relativistic particles on the cosmological parameters derived from the cosmic microwave background     

R. Bowen  S. H. Hansen  A. Melchiorri  Joseph Silk  R. Trotta 《Monthly notices of the Royal Astronomical Society》2002,334(4):760-768

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Fast parameter estimation from the cosmic microwave background power spectrum     

Sujata Gupta  Alan F. Heavens 《Monthly notices of the Royal Astronomical Society》2002,334(1):167-172

The statistical properties of a map of the primary fluctuations in the cosmic microwave background (CMB) may be specified to high accuracy by a few thousand power spectra measurements, provided the fluctuations are Gaussian, yet the number of parameters relevant for the CMB is probably no more than ∼10–20. Consequently, there is a large degree of redundancy in the power spectrum data. In this paper, we show that the moped data compression technique can reduce the CMB power spectrum measurements to ∼10–20 numbers (one for each parameter), from which the cosmological parameters can be estimated virtually as accurately as from the complete power spectrum. Combined with recent advances in the speed of generation of theoretical power spectra, this offers opportunities for very fast parameter estimation from real and simulated CMB skies. The evaluation of the likelihood itself, at Planck resolution, is speeded up by factors up to ∼10⁸, ensuring that this step will not be the dominant part of the data analysis pipeline.  相似文献   

贾岛家世新考     

齐文榜 《广东海洋大学学报》2004,24(5):88-94

用详实的材料 ,经过周密考证 ,澄清了有关贾岛家世的错误认识 ,揭橥了此一方面研究的最新成果。  相似文献   

Microwave background radiation related evidence in favour of the standard model     

Ravi Subrahmanyan 《Journal of Astrophysics and Astronomy》1997,18(4):251-255

The discovery of the 3K microwave background radiation (MBR) and its interpretation as a relict of the hot big bang was probably the most important observation that led to the elevation of the hot big bang model to the status of a ‘Standard Model’. The temperature of this background is consistent with the primordial nucleosynthesis hypothesis. Detailed measurements of the spectrum and angular anisotropy of this radiation background have been found — within the measurement errors - to be consistent with the expectations of the Standard Model and with the formation of structure from the gravitational growth of primordial seed density perturbations within this framework.  相似文献   

A speedy pixon image reconstruction algorithm     

Vincent Eke 《Monthly notices of the Royal Astronomical Society》2001,324(1):108-118

A speedy pixon algorithm for image reconstruction is described. Two applications of the method to simulated astronomical data sets are also reported. In one case, galaxy clusters are extracted from multiwavelength microwave sky maps using the spectral dependence of the Sunyaev–Zel'dovich effect to distinguish them from the microwave background fluctuations and the instrumental noise. The second example involves the recovery of a sharply peaked emission profile, such as might be produced by a galaxy cluster observed in X-rays. These simulations show the ability of the technique both to detect sources in low signal-to-noise ratio data and to deconvolve a telescope beam in order to recover the internal structure of a source.  相似文献   

Bumpy power spectra and ΔT/T     

Louise M. Griffiths  Joseph Silk  Saleem Zaroubi 《Monthly notices of the Royal Astronomical Society》2001,324(3):712-716

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