Back to Laboratory Scripts
The Hubble Ultra Deep Field (HUDF) is a long-exposure image (one million seconds in total) produced from a series of exposures taken with the Hubble Space Telescope between 2003 September 24 and 2004 January 16. The image was taken with Hubble's Advanced Camera for Surveys, and reveals galaxies more numerous and even fainter than those seen in the previous Hubble Deep Fields taken in 1995 and 1998. (The 1995 image is used in the current Classification of Galaxies experiment).
For students interested in examining in more detail the wide range of sizes, shapes, and colours of galaxies seen in the HUDF, a set of images is provided here.
The image files are compressed JPEG images, though some of them are still quite large. Old computers (made prior to about 2004) may have insufficient memory to display the larger images. If problems occur, try the smaller versions. The full-resolution images will show the greatest detail.
Note that your browser may automatically shrink the images to fit in to the browser's window. Depending on the browser, you may need to either click on the image, or on a zoom icon that appears on top of the image, to see the full detail.
These images are also included as part of the sample images of the ImageJ application, available from the Astronomy Software page.
1. The full-resolution HUDF image (6200 x 6200 pixels) is divided into nine overlapping squares, each 2400 x 2400 pixels, in three rows and three columns:
|Top Left||Top Middle||Top Right|
|Centre Left||Centre||Centre Right|
|Bottom Left||Bottom Middle||Bottom Right|
2. HUDF image at 1/2 scale (3100 x 3100 pixels)
This is a reduced size version of the complete HUDF. Each pixel is the average of four full-resolution pixels. Look at the entire image (3100 x 3100) or at four smaller overlapping sections of the image (not included in the ImageJ application):
|Top Left||Top Right|
|Bottom Left||Bottom Right|
3. HUDF image at 1/4 scale (1567 x 1547 pixels)
This is an even smaller version of the complete HUDF, in which each pixel is the average of 16 full-resolution pixels (so there is significant loss of detail).