Share

News Release Archive:

News Release 82 of 293

October 30, 2008 09:00 AM (EDT)

News Release Number: STScI-2008-37

Hubble Scores a Perfect Ten

Back

Image: Interacting Galaxies Arp 147

Interacting Galaxies Arp 147STScI-PRC2008-37

Screen-use options: These files are created for viewing on your monitor

Print-use download options: These files are designed to fit on letter-size paper

Highest-quality download options: The best resolution available

Download WALLPAPER from HubbleSite's GALLERY.
Selecting this will take you out of HubbleSite's NewsCenter and relocate you to the HubbleSite Gallery where this wallpaper can be downloaded.

ABOUT THIS IMAGE:

NASA's Hubble Space Telescope is back in business.

Just a couple of days after the orbiting observatory was brought back online, Hubble aimed its prime working camera, the Wide Field Planetary Camera 2 (WFPC2), at a particularly intriguing target, a pair of gravitationally interacting galaxies called Arp 147.

The image demonstrated that the camera is working exactly as it was before going offline, thereby scoring a "perfect 10" both for performance and beauty.

The two galaxies happen to be oriented so that they appear to mark the number 10. The left-most galaxy, or the "one" in this image, is relatively undisturbed apart from a smooth ring of starlight. It appears nearly on edge to our line of sight. The right-most galaxy, resembling a zero, exhibits a clumpy, blue ring of intense star formation.

The blue ring was most probably formed after the galaxy on the left passed through the galaxy on the right. Just as a pebble thrown into a pond creates an outwardly moving circular wave, a propagating density wave was generated at the point of impact and spread outward. As this density wave collided with material in the target galaxy that was moving inward due to the gravitational pull of the two galaxies, shocks and dense gas were produced, stimulating star formation.

The dusty reddish knot at the lower left of the blue ring probably marks the location of the original nucleus of the galaxy that was hit.

Arp 147 appears in the Arp Atlas of Peculiar Galaxies, compiled by Halton Arp in the 1960s and published in 1966. This picture was assembled from WFPC2 images taken with three separate filters. The blue, visible-light, and infrared filters are represented by the colors blue, green, and red, respectively.

The galaxy pair was photographed on October 27-28, 2008. Arp 147 lies in the constellation Cetus, and it is more than 400 million light-years away from Earth.

For additional information, contact:

Ray Villard
Space Telescope Science Institute, Baltimore, Md.
410-338-4514
villard@stsci.edu

Mario Livio
Space Telescope Science Institute, Baltimore, Md.
410-338-4439
mlivio@stsci.edu

Object Name: Arp 147

Image Type: Astronomical

Credit: NASA, ESA, and M. Livio (STScI)

NEWS RELEASE IMAGES

All images from this news release:

To access available information and downloadable versions of images in this news release, click on any of the images below: