scholarly journals Space Distribution of Radio-Source Populations

1996 ◽  
Vol 175 ◽  
pp. 547-552
Author(s):  
J.V. Wall
Keyword(s):  
Radio Source ◽  
Survey Data ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Space Distribution ◽  
Extragalactic Radio Source ◽  
The Status ◽  
Source Populations

This paper sets out the status of data determining the space distribution of extragalactic radio-source populations, describes some recent results from analyses of the data, and indicates why and how the analyses need revision in the light of unified models. It concludes by emphasizing the severity of the effects of large-scale structure on modern survey data.

scholarly journals SDSS-III Baryon Oscillation Spectroscopic Survey Data Release 12: galaxy target selection and large-scale structure catalogues

2015 ◽  
Vol 455 (2) ◽  
pp. 1553-1573 ◽  
Author(s):  
Beth Reid ◽  
Shirley Ho ◽  
Nikhil Padmanabhan ◽  
Will J. Percival ◽  
Jeremy Tinker ◽  
...  
Keyword(s):  
Survey Data ◽  
Large Scale ◽  
Target Selection ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Data Release

scholarly journals Cosmic cartography of the large-scale structure with Sloan Digital Sky Survey data release 6

2009 ◽  
Vol 400 (1) ◽  
pp. 183-203 ◽  
Author(s):  
Francisco S. Kitaura ◽  
Jens Jasche ◽  
Cheng Li ◽  
Torsten A. En��lin ◽  
R. Benton Metcalf ◽  
...  
Keyword(s):  
Survey Data ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release

scholarly journals Determination of the large-scale and super-large-scale structure by means of the space distribution of quasars

1986 ◽  
Vol 119 ◽  
pp. 495-496
Author(s):  
Y.Y. Zhou ◽  
D.P. Fang ◽  
Z.G. Deng ◽  
X.T. He
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Space Distribution ◽  
The Universe

It is very important to study the large-scale structure by means of the space distribution of quasars. Using this method, one may search for the more distant superclusters and explore the super-large-scale structure, i.e., the existence of super-superclusters. The answer to the problem would be of great interest. It is related to the question about the transition of the clustering of galaxies on about 100 Mpc to the uniformity of the universe. Recently Oort et al and de Ruiter et al suggested that the quasars are located in superclusters. So we soppose that analysing the space distribution of quasars might give us some information about the super-large-scale structure of the universe. But up to the present the study of the clustering of quasars has not obtained universally accepted conclusions; in fact, some of them, including grouping and clustering (Arp; Chu and Zhu), no clustering (Chu and Zhu; Osmer; Webster), clustering for z < 2 and no clustering for z > 2 (Fang et al) and stringing (Deng et al), are contradictory.

scholarly journals A (2). Overall Structure: Space Distribution and Motions in the Disk

1955 ◽  
Vol 1 ◽  
pp. 13-24
Keyword(s):  
Large Scale ◽  
Galactic Plane ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Space Distribution ◽  
Interstellar Gas ◽  
Giant Stars ◽  
Galactic System ◽  
Wide Range ◽  
The Common

The population of the disk consists of a great variety of objects with a wide range of concentration towards the galactic plane and of peculiar motions. The extreme population I objects like interstellar gas and dust and super-giant stars, show quite different properties with respect to space distribution and motions, compared to such stars as, for instance, the common G and K giants. The discussions at the conference have concentrated on the observational possibilities of studying the correlation—or the lack of correlation—between the space distributions of different kinds of objects. From recent theoretical as well as observational work it has become apparent that there is a wide range in the ages of the stars contributing to the disk population, from a few million so some 1000 million years. The differences in the distributions of the various kinds of stars very probably must be interpreted in terms of these differences in age and evolution. The most intriguing problem for the present thus seems to be this: Can we trace large-scale structure in the distribution of objects of different ages, and can we derive information on the evolution of the galactic system and of the stars themselves from the degree of resemblance in the large-scale structure exhibited by different objects?

scholarly journals Radio Surveys and Large Scale Structure

1991 ◽  
Vol 44 (6) ◽  
pp. 759 ◽  
Author(s):  
PA Shaver
Keyword(s):  
Radio Source ◽  
Large Scale ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Radio Galaxies ◽  
Scale Structure ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Normal Galaxies ◽  
Dimensional Distribution

An analysis of the Molonglo Reference Catalogue indicates that significant departures from isotropy are present in the sky distribution of strong extragalactic radio sources. This has been shown to be due to local large scale structure, specifically a concentration to the supergalactic plane, which also influences the slope of the source counts. A study of the three-dimensional distribution of local radio galaxies shows that they are more strongly concentrated to the supergalactic plane than are optically�selected galaxies, and that the supergalactic concentration is more extensive than hitherto believed. It appears that radio galaxies (and clusters of galaxies) trace the 'skeleton' of large scale structure, about which normal galaxies are more loosely distributed. Thus, while large scale structure evidently complicates the interpretation of radio source counts, it appears that radiO surveys can be of value in exploring structures on the largest scales.

scholarly journals Radio Source Counts at Ultra Low Frequencies: Results, Significance and Implication for Observational Cosmology

1995 ◽  
Vol 164 ◽  
pp. 455-455
Author(s):  
K.P. Sokolov
Keyword(s):  
Radio Source ◽  
Large Scale ◽  
Low Frequency ◽  
Space Distribution ◽  
Observational Cosmology ◽  
Radio Sources ◽  
Extragalactic Radio Source ◽  
Low Frequencies ◽  
Extended Radio ◽  
Frequency Source

Analysis of cosmological evolution effects in the low-frequency source counts at 25 MHz obtained with the UTR-2 radio telescope and conclusions on the large-scale extragalactic radio source space distribution are presented. The data require the existence of a decrease in the space distribution of the most distant extended radio sources.

The Space Distribution of Local Radio and X-ray Galaxies

1990 ◽  
Vol 8 (3) ◽  
pp. 250-251 ◽  
Author(s):  
P. A. Shaver
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Space Distribution ◽  
X Ray ◽  
Local Structures ◽  
Redshift Surveys ◽  
Galaxy Redshift ◽  
Dominant Structure ◽  
Local Radio

Extended abstractLocal large scale structure is best studied using statistically complete samples which cover the entire sky, and for which full redshift information is available. The optical galaxy redshift surveys which have been made to date involve many thousands of objects but cover only limited parts of the sky, and so provide only a fragmented picture of local large scale structure. Complete samples of radio and X-ray galaxies are available, however, with large sky coverage. While the number of objects is small, they may still suffice to define the dominant local structures, particularly as they may preferentially sample the deeper gravitational potentials and so provide a more efficient tracer of dominant structure.

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