Image Processing Reference
In-Depth Information
Figure3.9 Karl Jansky and his steerable 14.6-m wavelength radio antenna. (Courtesyof
Figure 3.10 shows an image of the entire sky as seen with lightwaves in the
microwave band. The elliptical shape of the sky image is a projection of the
spherical surface of the sky called anAitoffprojection. The pseudocolor bar
on the right side of the image indicates the relative intensity of microwaves,
white being the strongest intensity and black the weakest. The light used to
form this image has a wavelength of 73 cm, and is emitted by sources such as
pulsars,supernovaremnants, and gas-filled, star-forming regions of space. Stars
emit very little energy at this wavelength, therefore this radio image of the sky
is essentially devoid of stars! The light we see in this image is generated by
mechanisms that are nonthermal in nature, meaning that the objects that emit light
Figure3.10 Microwave sky in the 73-cm waveband. (CourtesyofNASA)
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