scholarly journals Relations Between the Optical and Radio Properties of Extragalactic Radio Sources

1977 ◽  
Vol 74 ◽  
pp. 223-235
Author(s):  
E. M. Burbidge
Keyword(s):  
Optical Properties ◽  
Physical Theory ◽  
Radio Sources ◽  
Intrinsic Properties ◽  
Extragalactic Radio Sources ◽  
Nonthermal Radiation ◽  
The Universe

Correlations between the radio and optical properties of radio sources have proved elusive and the main conclusion to be drawn from this is that there is a great variety of objects in the universe that emit nonthermal radiation, so that attempts to use these objects for cosmological purposes can be frustrated unless one can find some way of selecting objects that do have common intrinsic properties. Despite this, the search for relations and correlations is interesting quite apart from cosmology, because such correlations should provide a groundwork for a physical theory or theories of what is really happening in sources of nonthermal radiation.

scholarly journals Expanding Quasars and the Expansion of the Universe

1988 ◽  
Vol 129 ◽  
pp. 23-24
Author(s):  
M. H. Cohen ◽  
P. D. Barthel ◽  
T. J. Pearson ◽  
J. A. Zensus
Keyword(s):  
Active Galactic Nuclei ◽  
Upper Bound ◽  
Proper Motion ◽  
Galactic Nuclei ◽  
Radio Sources ◽  
Extragalactic Radio Sources ◽  
Expansion Of The Universe ◽  
The Universe

The μ–z diagram (Figure 1) plots the observed internal proper motion μ versus redshift z for 32 extragalactic radio sources associated with active galactic nuclei. The observed points fall below an upper bound which decreases with redshift; there is a statistically significant anticorrelation between redshift and internal proper motion.

scholarly journals Spatial Correlation Functions of Bright Radio Galaxies

1988 ◽  
Vol 130 ◽  
pp. 580-580 ◽  
Author(s):  
You-yuan Zhou ◽  
Yi-peng Jing
Keyword(s):  
Correlation Function ◽  
Spatial Correlation ◽  
Correlation Functions ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Spatial Correlation Function ◽  
Extragalactic Radio Sources ◽  
Large Separation ◽  
The Universe

Because of their large separation bright radio galaxies characterize the structure of the universe on the scales of clusters and superclusters. In order to calculate the spatial correlation function we choose radio galaxies in radio surveys, for which the redshift values have been measured. One is from Bright Radio Sources at 178 MHz (Liang, Riley and Longair 1983), and another is from All-Sky Catalogue of Bright Extragalactic Radio Sources at 2.7 GHz (Wall and Peacock 1985).

Some Intrinsic Properties of Parsec-scale Radio Jets

1996 ◽  
Vol 13 (1) ◽  
pp. 103-105
Author(s):  
Steven J. Tingay
Keyword(s):  
Simple Model ◽  
Radio Source ◽  
Flow Direction ◽  
Line Of Sight ◽  
Radio Sources ◽  
Intrinsic Properties ◽  
Extragalactic Radio Sources ◽  
Radio Jets ◽  
Relativistic Fluid ◽  
Relativistic Jet

AbstractA simple model for estimating the intrinsic flow direction and speed in the parsec-scale jets associated with extragalactic radio sources is presented. In this model, radio source brightness asymmetries are attributed to the apparent amplification caused when a relativistic jet of radiating material is somewhat aligned with the observers line of sight. The knots of emission commonly seen in parsec-scale radio jets are interpreted as shocks in the relativistic fluid.

scholarly journals The Extragalactic Optical/Radio Reference Frame. A Progress Report, IAU Comm. 24 Working Group

1986 ◽  
Vol 109 ◽  
pp. 173-177 ◽  
Author(s):  
Chr. de Vegt
Keyword(s):  
Optical Properties ◽  
Reference Frame ◽  
Working Group ◽  
Progress Report ◽  
Radio Sources ◽  
Extragalactic Radio Sources

A catalog of 233 strong compact extragalactic radio sources which display optical counterparts has been prepared by the working group as a basis for the establishment of an almost inertial extragalactic reference frame. Optical properties of the catalog sources are summarized and further requirements for a refinement and extension of the present data are discussed.

scholarly journals Optical Properties of High Redshift Radio Galaxies

1989 ◽  
Vol 134 ◽  
pp. 543-545
Author(s):  
Patrick J. McCarthy ◽  
Hyron Spinrad ◽  
Wil van Breugel
Keyword(s):  
Optical Properties ◽  
High Redshift ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Complete Sample ◽  
Redshift Range ◽  
Extragalactic Radio Sources ◽  
Look Back ◽  
Hubble Time

The 3CR catalogue of extragalactic radio sources is now completely identified for b > 15° and redshifts have been determined for > 98% of them (see Djorgovski et al. 1988 for the latest update). The radio galaxies in this catalogue span the redshift range from 0 to 2.48. This sample provides us with a unique opportunity to examine the optical and radio properties of a complete sample over a look-back time comparable to the Hubble time.

scholarly journals Radio Galaxies and Quasars as Cosmological Probes

1996 ◽  
Vol 168 ◽  
pp. 71-78
Author(s):  
Ashok K. Singal
Keyword(s):  
Angular Size ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Powerful Radio ◽  
Extragalactic Radio Sources ◽  
Relativistic Beaming ◽  
Extended Radio ◽  
Statistical Sense ◽  
Cosmological Tests ◽  
The Universe

Various techniques and methods that have been developed for using extragalactic radio sources as cosmological probes of the universe are listed. The discussion is mainly confined to the cosmological tests employing extended radio sizes of powerful radio galaxies and quasars as standard metric rods (in a statistical sense) to figure out the geometry of the universe. Some comments are made on the recent use of the milliarcsec scale sizes of compact radio sources for angular size–redshift tests. It is further pointed out that the estimates of clustering for quasars selected at centimetre wavelengths could be seriously affected by the relativistic beaming.

Quantitative Conditions and Convergent Operations That Are Compatible With the Universe as a Persistent Generator of Successive Simulations

2016 ◽  
Vol 12 (1) ◽  
pp. 4178-4187
Author(s):  
Michael A Persinger ◽  
Stanley A Koren
Keyword(s):  
Structural Organization ◽  
Total Duration ◽  
Human Cognition ◽  
Intrinsic Properties ◽  
Basic Assumptions ◽  
Electron Orbit ◽  
Quantitative Analyses ◽  
Massive Information ◽  
The Universe

                The capacity for computer-like simulations to be generated by massive information processing from electron-spin potentials supports Bostrom’s hypothesis that matter and human cognition might reflect simulations. Quantitative analyses of the basic assumptions indicate the universe may display properties of a simulation where photons behave as pixels and gravitons control the structural organization. The Lorentz solution for the square of the light and entanglement velocities converges with the duration of a single electron orbit that ultimately defines properties of matter. The approximately one trillion potential states within the same space with respect to the final epoch of the universe indicate that a different simulation, each with intrinsic properties, has been and will be generated as a type of tractrix defined by ±2 to 3 days (total duration 5 to 6 days). It may define the causal limits within a simulation. Because of the intrinsic role of photons as the pixel unit, phenomena within which flux densities are enhanced, such as human cognition (particularly dreaming) and the cerebral regions associated with those functions, create the conditions for entanglement or excess correlations between contiguous simulations. The consistent quantitative convergence of operations indicates potential validity for this approach. The emergent solutions offer alternative explanations for the limits of predictions for multivariate phenomena that could be coupled to more distal simulations.

Super-luminal expansion in extragalactic radio sources

Nature ◽  
1977 ◽  
Vol 267 (5608) ◽  
pp. 211-216 ◽  
Author(s):  
R. D. Blandford ◽  
C. F. McKee ◽  
M. J. Rees
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources

Origin of the central radio gaps in extragalactic radio sources

1992 ◽  
Vol 187 (2) ◽  
pp. 209-214 ◽  
Author(s):  
I. E. Ekejiuba ◽  
P. N. Okeke ◽  
S. E. Okoye
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources
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