Discrete Radio Sources in the Spiral Galaxy NGC 6946

2000 ◽  
Vol 119 (4) ◽  
pp. 1711-1719 ◽  
Author(s):  
Scott D. Hyman ◽  
Christina K. Lacey ◽  
Kurt W. Weiler ◽  
Schuyler D. Van Dyk
Keyword(s):  
Spiral Galaxy ◽  
Radio Sources ◽  
Ngc 6946 ◽  
Discrete Radio Sources

scholarly journals Studying the contribution of components and type of spiral galaxy NGC 6946 using digital image processing

2019 ◽  
Vol 13 (28) ◽  
pp. 27-32
Author(s):  
A. K. Ahmed
Keyword(s):  
Spiral Galaxy ◽  
Rough Sets ◽  
Essential Element ◽  
National Research Institute ◽  
Astronomical Image ◽  
Ngc 6946 ◽  
Time Required ◽  
Variable Precision Rough Sets ◽  
Source Of Information ◽  
Classified Image

NGC 6946 have been observed with BVRI filters, on October 15-18,2012, with the Newtonian focus of the 1.88m telescope, Kottamiaobservatory, of the National Research Institute of Astronomy andGeophysics, Egypt (NRIAG), then we combine the BVRI filters toobtain an astronomical image to the spiral galaxy NGC 6946 whichis regarded main source of information to discover the components ofthis galaxy, where galaxies are considered the essential element ofthe universe. To know the components of NGC 6946, we studied itwith the Variable Precision Rough Sets technique to determine thecontribution of the Bulge, disk, and arms of NGC 6946 according todifferent color in the image. From image we can determined thecontribution for each component and its percentage, then what is thepercentage mean. In this technique a good classified image resultand faster time required to done the classification process.

scholarly journals Spectroscopy of H II regions in the late-type spiral galaxy NGC 6946

2013 ◽  
Vol 68 (1) ◽  
pp. 40-52 ◽  
Author(s):  
A. S. Gusev ◽  
F. H. Sakhibov ◽  
S. N. Dodonov
Keyword(s):  
Spiral Galaxy ◽  
H Ii Regions ◽  
Late Type ◽  
Ngc 6946

scholarly journals Observations of Galactic and Extragalactic Jets

1986 ◽  
Vol 89 ◽  
pp. 403-424
Author(s):  
R.A. Perley
Keyword(s):  
Radio Sources ◽  
Fourier Synthesis ◽  
Original Design ◽  
Quality Of Information ◽  
Very Large Array ◽  
Imaging Interferometer ◽  
Extragalactic Jets ◽  
Angular Extent ◽  
Discrete Radio Sources

Since nearly all discrete radio sources of astronomical interest are of insufficient angular extent for their detailed structural properties to be accessible to single-dish radio telescopes, radio interferometry must be employed to gain information on the morphologies of these objects. Recently constructed imaging interferometer arrays which employ the technique of Fourier synthesis, particularly MERLIN and the VLA (Very Large Array), and the more recent VLBI arrays, have given unprecedented imaging capabilities, with the result that our knowledge, and hence perceptions, of discrete radio sources have vastly changed over the last few years. An equally important parallel development has been image processing algorithms. These have vastly improved the quality of information produced by these arrays, so that an instrument such as the VLA can now produce images with speed and quality exceeding original design specifications by factors of 100 to 1000.

A Survey of Compact Radio Sources in NGC 6946

1997 ◽  
Vol 109 (2) ◽  
pp. 417-460 ◽  
Author(s):  
C. Lacey ◽  
N. Duric ◽  
W. M. Goss
Keyword(s):  
Radio Sources ◽  
Ngc 6946

scholarly journals Magnetic Fields in the Spiral Galaxy NGC 6946

1993 ◽  
Vol 157 ◽  
pp. 311-312
Author(s):  
Matthias Ehle ◽  
Rainer Beck
Keyword(s):  
Magnetic Field ◽  
Spiral Galaxy ◽  
High Frequency ◽  
Uniform Magnetic Field ◽  
Large Scale ◽  
Dynamo Model ◽  
Model Parameters ◽  
Radio Waves ◽  
Spiral Pattern ◽  
Ngc 6946

High frequency polarization observations reveal the existence of a large-scale ordered magnetic field in the disk of the spiral galaxy NGC 6946. At lower frequencies the disk is no longer transparent to polarized radio waves due to Faraday depolarization. The spiral pattern of the uniform magnetic field and the distribution of polarized intensities are fairly well simulated by a dynamo model. The model parameters indicate that the dynamo does not only operate in the disk, but also in the halo.

Apparent Angular Sizes of Discrete Radio Sources: Observations at Sydney

Nature ◽  
1952 ◽  
Vol 170 (4338) ◽  
pp. 1063-1064 ◽  
Author(s):  
B. Y. MILLS
Keyword(s):  
Radio Sources ◽  
Discrete Radio Sources

The spectra of some discrete radio sources in 10?5000 MHz frequency range

1970 ◽  
Vol 8 (2) ◽  
pp. 275-322 ◽  
Author(s):  
S. Ya. Braude ◽  
A. V. Megn ◽  
B. P. Ryabov ◽  
I. N. Zhouck
Keyword(s):  
Radio Sources ◽  
Frequency Range ◽  
Discrete Radio Sources
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