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Space Observation and Travel
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S Figure 18-3 Principle of the interferometer A single antenna
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has one wide response lobe (A) Two antennas, properly interconnected, have numerous narrow response lobes (B)
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both radio telescopes are aimed at the northern horizon The curves show the relative sensitivity of the radio telescope as a function of the azimuth These are two-dimensional slices of the true pattern, which is three-dimensional In three-space, the lobes are shaped like tapered cigars Interferometry cannot provide the sensitivity of a huge dish measuring many kilometers in diameter, but it does provide the equivalent directivity at a far lower cost and inconvenience In some cases, the radio image resolution can be on the order of a few seconds of arc
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Today, there are radio telescopes in many countries throughout the world These radio telescopes have proven worth the trouble and the expense of their construction The mysterious, fascinating quasars and pulsars were found using radio telescopes; only later did astronomers start analyzing these objects with optical telescopes
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When a radiotelescope with sufficient resolving power is used to map the sky, certain regions of greater and lesser radio emission are found The center of our galaxy, located in the direction of the constellation Sagittarius, is a powerful radio source The Sun is a fairly strong emitter of radio waves, as is the planet Jupiter A strong source of radio waves is found in the constellation Cygnus, and it has been named Cygnus A The Australian radio astronomers J Bolton and G Stanley determined that Cygnus A has a very tiny angular diameter, and they also found many other localized radio sources This led to the development of a system for naming radio sources A significant celestial source of radio waves is designated according to the constellation in which it is found, followed by a letter that indicates its relative radio intensity within that constellation The letter A is given to the strongest source in a given constellation, the letter B to the second strongest, and so on Cygnus A is the strongest source of radio emissions in Cygnus and also, it so happens, in the entire sky It is so small in diameter that its output fluctuates because of effects of Earth s ionosphere as the signals pass through on their way to the surface Cygnus A is a radio galaxy Using radio telescopes, maps of the sky have been made, in the same way that optical astronomers make star and galactic maps Radio maps do not look like optical maps Instead, they appear like topographic maps used in geologic surveys or like computerized abstract art Regions of constant radio emission are plotted along lines, which tend to be curved Or they can be rendered as pixelated images in color or grayscale, as shown in Fig 18-4, an image of a hypothetical radio galaxy viewed edgewise (The smaller objects are hypothetical foreground stars within our own galaxy) The better the directivity of the radio telescope, the greater is the number of discrete radio objects that can be defined on such a map In radio maps of the entire sky, the Milky Way shows up as a group of lines or colored regions with their widest breadth (representing the greatest intensity) in the constellation Sagittarius Other galaxies have been found
PART 5
Space Observation and Travel
Figure 18-4 Radio map of a celestial object, in this case a hypothetical
galaxy viewed edgewise Shades of gray indicate relative radio brightness
that emit radio frequency (rf) energy Scientists at Cambridge University, in the early days of radio astronomy, identified four different external galaxies as radio sources One of these is the Great Nebula in Andromeda, approximately 22 million light-years from our own galaxy
RECEPTION FROM THE SOLAR SYSTEM
As radio astronomy evolved, scientists turned their attention to several objects in our own Solar System One of these is the Sun The radio Sun is somewhat larger than the visible solar disk, and it appears oblate or flattened along the plane of the equator This is to say, the apparent diameter of the radio Sun is smallest through the poles and largest through the equator Visible solar flares are also observed with radio telescopes Such flares have long been associated with disruption of the ionosphere of our planet, a phenomenon that wreaks havoc with radio broadcasting and communications at some frequencies There are several different kinds of solar flares at radio wavelengths Radio outbursts from the Sun usually portend a disturbance
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