Black holes, galaxies young and old visible in massive mapping of the night sky

October 03, 2007

PITTSBURGH-Color images documenting the past 10 billion years of galactic evolution were distributed online this week as part of the first public release of data from a massive project to map a distant region of the universe that combines the efforts of nearly 100 researchers from around the world, including the University of Pittsburgh.

Researchers in the All-wavelength Extended Groth Strip International Survey, or AEGIS, observed the same small region of sky using all available wavelengths of the electromagnetic spectrum--from X-rays to ultraviolet, visible, infrared, and radio waves. The survey focused on the Extended Groth Strip, an area the width of four full moons near the "handle" of the Big Dipper constellation. Four color images from four different satellite telescopes, as well as numerous data catalogs tabulating the properties of and distances to tens of thousands of galaxies, are now available on both the AEGIS Web site and Google Sky, a downloadable program that allows home computer users to explore these distant galaxies up close and in sharp detail.

Pitt physics and astronomy professor Jeffrey Newman is a key member of the AEGIS project's core team, the Deep Extragalactic Evolutionary Probe, or DEEP2 team. That team measured optical spectra-detailed breakdowns of the amount of light of a given color we see--for 50,000 galaxies, including 14,000 galaxies in the Extended Groth Strip. These spectra tie together all of the AEGIS datasets by allowing the team to determine each galaxy's distance from Earth. Once the distance is known, astronomers know how far back in time light left a galaxy and, thus, its age. The most distant galaxies in the survey-up to 9 billion light years away-appear as they were only a few billion years after the Big Bang.

Newman then worked directly with Google's Pittsburgh office to convert data from AEGIS into color images for Google Sky and share the information with the general public. Google Sky users can view and explore the Groth Strip in ultraviolet, visible, infrared, or X-ray light--or combine perspectives. "Each wavelength provides unique information about the characteristics of distant galaxies," Newman said.

Newman also worked on the team that created the most detailed of the four color images being released: A visible-light mosaic of 63 separate snapshots from the Hubble Space Telescope. It is the largest unbroken color mosaic ever made with Hubble images and provides images of approximately 50,000 faraway galaxies, including infant and adolescent galaxies just taking on their mature forms.

AEGIS' second image shows the same galaxies through the ultraviolet eyes of NASA's Galaxy Evolution Explorer (GALEX). Young stars produce ultraviolet light in abundance; GALEX brightness therefore provides a measure of the rate at which each galaxy is forming stars. Galaxies that contain relatively few young stars or are obscured by dust or intergalactic gas will appear redder in the GALEX image.

The brightness of galaxies in the third image, taken with the Infrared Array Camera on NASA's Spitzer Space Telescope, is closely related to the total amount of stars they have formed. The colors of a galaxy as seen through infrared eyes reveal information on both its contents (stars and dust) and its distance from us.

The fourth image, produced with data from NASA's Chandra X-ray Observatory, reveals the highly energetic X-ray radiation produced when gas spirals into a supermassive black hole, like those believed to lie at the center of almost every galaxy. Many of the X-ray-emitting objects lie buried within otherwise normal-looking galaxies. In the X-ray images, the bluest objects are the ones most obscured by gas within their host galaxies.
More information about the survey, science results to date, and links to additional images and data that can be downloaded from the AEGIS Web site at The AEGIS data release also is featured this week on the Google Earth Gallery at To use the Sky feature, users must have the most recent version of Google Earth (version 4.2). From the gallery site, click on "Learn more" to find the link to the AEGIS KML file. The KML file and instructions for viewing the AEGIS images are also available on the AEGIS Web site.

Future AEGIS data releases will feature images taken with other wavelengths such as radio waves. A master catalog is being prepared that combines information from all of AEGIS's many views of the sky. As future images are prepared, they and the growing data catalogs will all be linked through Google Sky.

The AEGIS teams that contributed images and data for this release include the DEEP2 team led by Marc Davis of the University of California at Berkeley and Sandra Faber at the University of California at Santa Cruz; the Hubble team also led by Davis; the Chandra team led by Kirpal Nandra of Imperial College, London; the Spitzer team led by Giovanni Fazio of the Harvard-Smithsonian Center for Astrophysics; and the GALEX team led by Chris Martin of the California Institute of Technology. Funding for the AEGIS collaboration was provided by the National Science Foundation and NASA.

University of Pittsburgh

Related Color Articles from Brightsurf:

Envision color: Activity patterns in the brain are specific to the color you see
Researchers at the National Eye Institute (NEI) have decoded brain maps of human color perception.

OPD optical sensors that reproduce any color
POSTECH Professor Dae Sung Chung's team uses chemical doping to freely control the colors of organic photodiodes.

What laser color do you like?
Researchers at the National Institute of Standards and Technology (NIST) and the University of Maryland have developed a microchip technology that can convert invisible near-infrared laser light into any one of a panoply of visible laser colors, including red, orange, yellow and green.

Increasing graduation rates of students of color with more faculty of color
A new analysis published in Public Administration found that student graduation rates improve as more faculty employed by a college or university share sex and race/ethnic identities with students.

How much color do we really see?
Color awareness has long been a puzzle for researchers in neuroscience and psychology, who debate over how much color observers really perceive.

Stretchable variable color sheet that changes color with expansion and contraction
Toyohashi University of Technology research team have succeeded in developing a variable color sheet with a film thickness of 400 nanometers that changes color when stretched and shrunk.

High color purity 3D printing
ICFO researchers report on a new method to obtain high color purity 3D objects with the use of a new class of nanoparticles.

Building a better color vision test for animals
University of Cincinnati biologists modified simple electronics to create a color vision test for fiddler crabs and other animals.

The color of your clothing can impact wildlife
Your choice of clothing could affect the behavioral habits of wildlife around you, according to a study conducted by a team of researchers, including faculty at Binghamton University, State University of New York.

Recovering color images from scattered light
Engineers at Duke University have developed a method for extracting a color image from a single exposure of light scattered through a mostly opaque material.

Read More: Color News and Color Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to