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High resolution images from NASA's Spitzer infrared telescope and GALEX ultraviolet telescope show the difference in the distribution of young and old stars in the Arp 65 pair of interacting galaxies. In the short-wavelength infrared at 3.6 microns (first image), cool old stars are bright, so the beautiful grand design spiral patterns in the old stellar disks are visible. In contrast, at longer infrared wavelengths, at 8 microns, bright clumps of young stars are detected (second image). The difference in distribution between the old and young stellar populations is clear in the third image, where the 3.6 micron (blue) and 8.0 micron (red) images are combined. This clumpy structure is also present in the ultraviolet, as revealed in the GALEX ultraviolet images (fourth image, with near-ultraviolet in yellow and far-ultraviolet in blue).

These images were presented at the American Astronomical Society meeting in Minneapolis, Minnesota, on May 30, 2005

File info

Description Interacting Galaxy Pair Arp 65
Date 2005/06/09
Source http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig05-005
Author NASA/JPL-Caltech/M. L. Giroux (East Tennessee State University)
(Reusing this file)


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see http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig05-005 High quality tif files also avaliable.


Public domain This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)

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EXIF data:
File name sig05-005.jpg
Size, Mbytes 1.40378515625
Mime type image/jpeg
Orientation of image 1
Image resolution in width direction 300
Image resolution in height direction 300
Unit of X and Y resolution 2
Color space information 65535
Exif image width 1500
Exif image length 1200
Software used Adobe Photoshop 7.0

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