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Large and Small Scale Structure
Large scale structure refers to the big features of an object, spanning
wide regions of space. Traversing more compact regions, the finer details denote
small scale structure.
Large Scale Structure in M82; low spatial resolution
JPEG Image (12.6K); Credit and Copyright
Small Scale Structure in M82; high spatial resolution
JPEG Image (27K); Credit and Copyright
Scale and Resolution
High spatial resolution results not only in clearer
images; it also provides a means to extract the image information
at different levels of detail. Notice you cannot discern the overall oval shape of M82 in the bottom image, but
you can in the top one. The oval shape visible in the upper image is considered
to be a large scale structure. To resolve it, the Very Large Array
was set at a low
spatial resolution, discerning only large details.
On the other hand, the small red point in the center of M82 is visible only in the bottom
image. Here, high resolution was selected in order to pick out the fine details.
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Copyright © 1995, The Board of Trustees of the University of
Illinois
NCSA. Last modified 11/12/95
