Other Tricolor Images
You can sometimes learn more about an object by looking at different
types of images. Other tricolor images can be made using images from
other wavelengths of light. Another sky survey called 2MASS (the 2 Micron
All Sky Survey) creates
tri-color images using three different filters, called the J, H, and K
filters, that all lie in the
Constructing a 2MASS Color Image of NGC5719
(courtesy the Two Micron All Sky Survey*)
|The J Filter
||The H Filter
||The K Filter
||A Tri-Color Image
Create another image of NGC 1087 using SDSS's ultraviolet, green and red images for
the blue, green and red filters respectively. Adjust the color
balance and max and min brightness to bring out the most detail.
How does this image differ from the green, red and infrared image you made in
Which parts of the galaxy stand out more prominently? Which stand
out less prominently?
Repeat Exercise 4 for a different combination of filters that you
have not yet attempted.
As you may have learned in the Color unit, objects tend to give off
more light in certain wavelengths than others. Some objects give off
a lot of red light, where others might give off more ultraviolet or
infrared. You can see some of the differences in the images you just
*Atlas Image obtained as part of the Two Micron
All Sky Survey (2MASS), a joint project of the University of Massachusetts
and the Infrared Processing and Analysis Center/California Institute of
Technology, funded by the National Aeronautics and Space Administration
and the National Science Foundation.