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We examine the sky distribution of radio galaxies in the NRAO VLA Sky Survey (NVSS) and the Rapid ASKAP Continuum Survey (RACS). Analyses of these samples have reported tension between their inferred dipoles and the kinematic dipole of the…

宇宙学与河外天体物理 · 物理学 2024-06-05 Oliver T. Oayda , Vasudev Mittal , Geraint F. Lewis , Tara Murphy

Little attention has been given to the correlation coefficient when data come from discrete or continuous non-normal populations. In this article, we consider the efficiency of two correlation coefficients which are from the same family,…

统计方法学 · 统计学 2015-11-06 Michael Tsagris , Ioannis Elmatzoglou , Christos C. Frangos

The two-point correlation function (2pcf) is the key statistic in structure formation; it measures the clustering of galaxies or other density field tracers. Estimators of the 2pcf, including the standard Landy-Szalay (LS) estimator,…

宇宙学与河外天体物理 · 物理学 2021-03-31 Kate Storey-Fisher , David W. Hogg

In this paper we show normalized differential source counts n(S) at 408 MHz and 1.4 GHz of radio sources separately for FRI and FRII classes with extended and compact morphologies. The maps from the FIRST, NVSS, and WENSS surveys are used…

天体物理学 · 物理学 2009-11-10 M. Jamrozy

Low frequency radio wave scattering and refraction can have a dramatic effect on the observed size and position of radio sources in the solar corona. The scattering and refraction is thought to be due to fluctuations in electron density…

太阳与恒星天体物理 · 物理学 2021-01-04 Pearse C. Murphy , Eoin P. Carley , Aoife Maria Ryan , Pietro Zucca , Peter T. Gallagher

This is the second of two papers describing the second data release (DR2) of the Australia Telescope Large Area Survey (ATLAS) at 1.4 GHz. In Paper I we detailed our data reduction and analysis procedures, and presented catalogues of…

星系天体物理 · 物理学 2015-06-19 C. A. Hales , R. P. Norris , B. M. Gaensler , E. Middelberg

We consider the effect of lensing by galaxy clusters on the angular distribution of submillimeter wavelength objects. While lensing does not change the total flux and number counts of submillimeter sources, it can affect the number counts…

天体物理学 · 物理学 2009-10-31 Evan Scannapieco , Joseph Silk , Jonathan C. Tan

We present a new analysis of the widely used relation between cavity power and radio luminosity in clusters of galaxies with evidence for strong AGN feedback. We study the correlation at low radio frequencies using two new surveys - the…

Cellular systems are becoming more heterogeneous with the introduction of low power nodes including femtocells, relays, and distributed antennas. Unfortunately, the resulting interference environment is also becoming more complicated,…

信息论 · 计算机科学 2013-04-29 Robert W. Heath , Marios Kountouris , Tianyang Bai

Through the use of a High Band Antenna system, the Low Frequency Array Two-Meter Sky Survey (LoTSS) is an attempt to complete a high-resolution survey of the northern celestial sky. To date, thousands of radio sources have been classified…

星系天体物理 · 物理学 2021-06-04 Antonio Paris

We present measurements of a population of matched radio sources at 1.4 and 5 GHz down to a flux limit of 1.5 mJy in 7 sq. degs. of the NOAO Deep Field South. We find a significant fraction of sources with inverted spectral indices that all…

宇宙学与河外天体物理 · 物理学 2015-06-04 Michael D. Schneider , Robert H. Becker , Willem de Vries , Richard L. White

We consider an alternative to conventional three-point statistics such as the bispectrum, which is purely based on the Fourier phases of the density field: the line correlation function. This statistic directly probes the non-linear…

宇宙学与河外天体物理 · 物理学 2017-01-25 Alexander Eggemeier , Robert E. Smith

We study how the two-point density correlation properties of a point particle distribution are modified when each particle is divided, by a stochastic process, into an equal number of identical "daughter" particles. We consider generically…

统计力学 · 物理学 2009-11-13 Andrea Gabrielli , Michael Joyce

We analyze the quasar two-point correlation function (2pCF) within the redshift interval $0.8<z<2.2$ using a sample of 52303 quasars selected from the recent 7th Data Release of the Sloan Digital Sky Survey. Our approach to 2pCF uses a…

宇宙学与河外天体物理 · 物理学 2010-10-12 G. Ivashchenko , V. I. Zhdanov , A. V. Tugay

Red quasi-stellar objects (QSOs) are a subset of the luminous end of the cosmic population of active galactic nuclei (AGN), most of which are reddened by intervening dust along the line-of-sight towards their central engines. In recent work…

We report the first result of the clustering analysis of Sloan Digital Sky Survey (SDSS) quasars. We compute the two-point correlation function (2PCF) of SDSS quasars in redshift space at $8h^{-1}{\rm Mpc} < s < 500h^{-1}{\rm Mpc}$, with…

Two-parton correlations in the pion are investigated in terms of double parton distribution functions. A Poincar\'e covariant Light-Front framework has been adopted. As non perturbative input, the pion wave function obtained within the…

高能物理 - 唯象学 · 物理学 2018-10-17 Matteo Rinaldi , Sergio Scopetta , Marco Traini , Vicente Vento

The analysis of single-cell RNA sequencing (scRNA-seq) data often involves fitting a latent variable model to learn a low-dimensional representation for the cells. Validating such a model poses a major challenge. If we could sequence the…

统计方法学 · 统计学 2023-07-25 Anna Neufeld , Joshua Popp , Lucy L. Gao , Alexis Battle , Daniela Witten

A technique is presented to characterize the Signal-to-Interference-plus-Noise Ratio (SINR) of a representative link with a multiantenna linear Minimum-Mean-Square-Error receiver in a wireless network with transmitting nodes distributed…

信息论 · 计算机科学 2016-11-17 Junjie Zhu , Siddhartan Govindasamy , Jeff Hwang