scholarly journals Spectra for 107 Radio Sources Selected at 408 MHz

1973 ◽  
Vol 26 (6) ◽  
pp. 867 ◽  
Author(s):  
HS Murdoch ◽  
DG Hoskins
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Optical Identification ◽  
Density Measurements ◽  
Identification Rate ◽  
Significant Difference ◽  
Index Distribution ◽  
Optical Identifications ◽  
The Relationship ◽  
Very High

Radio spectra are presented for 107 sources which have previously been examined for optical identifications based on 408 MHz positions obtained with the Molonglo cross. Flux density measurements are given at five frequencies from 318 to 2695 MHz. The relationship between spectrum and optical identification is discussed. For sources with peaked, flat, or complex spectra the identification rate with QSO candidates is very high. For the remaining sources, no significant difference between the spectral index distribution of QSOs and galaxies is found.

7.8-GHz Flux Density Measurements of Variable Radio Sources

1972 ◽  
Vol 77 ◽  
pp. 819 ◽  
Author(s):  
William A. Dent ◽  
Gabriel Kojoian
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Density Measurements ◽  
Variable Radio

Optical Identification of the Strong Radio Source PKS 0511-48

1981 ◽  
Vol 4 (2) ◽  
pp. 187-189 ◽  
Author(s):  
J. G. Robertson ◽  
R. M. Smith
Keyword(s):  
Radio Source ◽  
Flux Density ◽  
Optical Identification ◽  
Low Frequencies ◽  
Complex Source ◽  
Optical Identifications

The radio source PKS 0511-48 is among the hundred strongest southern sources at low frequencies. It was catalogued in the Parkes survey (Ekers 1969) and mapped with the Molonglo Cross at 408 MHz by Schilizzi and McAdam (1975) with a resolution of 2′ .6 arc. It appeared in that work as a complex source, with an integrated flux density of 8.8 Jy. A search for optical identifications was made by Tritton and Schilizzi (1973), but none were found to a level of B ~ 19. We have inspected the field on the ESO B survey film, and find a group of ~ 20 faint galaxies (approximately 19-20 mag).

scholarly journals Articular Cartilage Gene Expression after Coxofemoral Joint Luxation in the Dog

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Korakot Nganvongpanit ◽  
Waranee Pradit ◽  
Siriwadee Chomdej
Keyword(s):  
Gene Expression ◽  
Articular Cartilage ◽  
Significant Difference ◽  
Joint Reduction ◽  
Articular Cartilages ◽  
Apoptotic Genes ◽  
Hip Luxation ◽  
The Relationship ◽  
Joint Luxation ◽  
Very High

This study examined the relationship between days of hip luxation and the expression of various mRNA. Twenty-six articular cartilages were used in the experiment: 3 samples were from normal dogs and 23 samples were collected from the femoral heads of hips that had been luxated for different lengths of time. Ten mRNA, including nonapoptotic genes(AGG, COL2A1, MMP-3, HAS-1, HAS-2, and TIMP-1)and apoptotic genes(BAX, BCL-2, CAS-3, and CAS-9), were studied for their expression using real-time PCR. We found very high correlation between expression level and luxation days (r2>0.9) inCOL2A1, MMP-3, HAS-1, HAS-2, TIMP-1, BAX, and CAS-9, while the others(AGG, BCL-2, and CAS-3)also showed high correlation (r2=7–9). And we found a significant difference (P<0.05) in the expression of transcripts depending on the number of luxation days. In conclusion, a delay in joint reduction may increase the chances of development of osteoarthritis.

scholarly journals Surveys of Radio Sources at 5 GHz

1977 ◽  
Vol 74 ◽  
pp. 63-74
Author(s):  
I. I. K. Pauliny-Toth
Keyword(s):  
Flux Density ◽  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Max Planck ◽  
Radio Astronomy Observatory ◽  
Density Relation ◽  
Strong Source ◽  
Optical Identifications ◽  
5 Ghz

A number of surveys have been carried out at a frequency of 5 GHz at the National Radio Astronomy Observatory (NRAO) and at the Max-Planck-Institut für Radioastronomie (MPIfR), with the aim of determining the number-flux density relation for the sources detected and also of obtaining their radio spectra and optical identifications. The surveys fall into two categories: first, the strong source (S) surveys, which are intended in due course to cover the whole northern sky and to be complete above a flux density of about 0.6 Jy; second, surveys of limited areas of sky down to lower levels of the flux density.

scholarly journals Accurate Optical Positions for Radio Source Identifications

1994 ◽  
Vol 47 (5) ◽  
pp. 657 ◽  
Author(s):  
Richard W Hunstead
Keyword(s):  
Radio Source ◽  
Southern Hemisphere ◽  
Radio Sources ◽  
Position Measurement ◽  
Optical Identification ◽  
Optical Position ◽  
Optical Identifications

The optical identification of strong radio sources was a key step in establishing a grid of southern hemisphere calibrators, both for Parkes and for Molonglo. However, the measurement of precise positions for these optical counterparts presented some special astrometric problems and led to some novel solutions. This paper summarises the progress of optical position measurement from a radio astronomer's viewpoint and examines the role of the COSMOS database against this background. The source 0007-44, from the first Parkes catalogue, is used as a case study to illustrate the present-day approach to optical identifications.

scholarly journals 5000 MHz Flux Densities and Spectra for 325 Small-diameter Radio Sources at Low Galactic Latitudes

1975 ◽  
Vol 28 (5) ◽  
pp. 633 ◽  
Author(s):  
JL Caswell ◽  
RF Haynes ◽  
DH Clark
Keyword(s):  
Flux Density ◽  
Small Diameter ◽  
Radio Sources ◽  
Density Measurements

Flux density measurements at 5000 MHz are presented for 325 of the small-diameter sources detected in the Molonglo 408 MHz galactic survey. By investigating the spectra we show that probably between 10 % and 15 % of the sources are galactic and the remainder extragalactic.

15.5-GHz flux-density measurements of variable radio sources

1974 ◽  
Vol 79 ◽  
pp. 1232 ◽  
Author(s):  
W. A. Dent ◽  
J. E. Kapitzky ◽  
G. Kojoian
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Density Measurements ◽  
Variable Radio
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