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Astronomy and Cosmology
Astronomy and Astrophysics
Radio source Hercules A and galaxy 3C 348
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[QUOTE="phyzguy, post: 6178096, member: 237160"] I would suggest going to the Sloan Digital Sky Survey, downloading an image of the galaxy, and measuring the half-light radius yourself. I went to the following link: [URL unfurl="true"]http://skyserver.sdss.org/dr15/en/tools/chart/image.aspx[/URL] Typed in the coordinates from [URL='https://en.wikipedia.org/wiki/Hercules_A']this page on Wikipedia[/URL] , and got the image below. This is just a jpeg image, but you can download a FITS file with the actual pixel values, from which calculating the half light radius is fairly simple. Then you will have not just a number, but an understanding of what is involved in obtaining it. Another useful source is NED. Go to the site below, and type 3C348 into the 'object name' field, and you will get a large amount of data and links to sources. [URL unfurl="true"]https://ned.ipac.caltech.edu/forms/byname.html[/URL][ATTACH type="full" alt="Herc_A.jpeg"]243446[/ATTACH] [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Radio source Hercules A and galaxy 3C 348
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