Mar 24 2011
From The Space Library
RELEASE: 11-086 NASA ADMINISTRATOR PRESENTS AWARD TO MARSHALL CENTER FOR AGENCY'S MOST EFFECTIVE SMALL BUSINESS PROGRAM HUNTSVILLE, Ala. --
NASA Administrator Charles Bolden participated in an event Thursday to highlight the contributions of small businesses to the agency's mission and the national economy at the Marshall Space Flight Center in Huntsville, Ala. The meeting of the Marshall Small Business Alliance provided networking opportunities and encouragement for businesses to compete for procurement and subcontracting opportunities. During the meeting, Bolden presented Marshall with an agency award for managing the most effective small business program. It was the second time in three years Marshall has earned NASA's Small Business Administrator's Cup. "Small business is crucial not only to NASA, but to the nation," NASA Administrator Charles Bolden said. "Federal procurement opportunities for women, minority and veteran-owned small businesses are critical to the economy and to sustaining economic development. Marshall's commitment to the small business community along with its broad and diverse portfolio is why the center is being recognized." Glenn Delgado, assistant administrator of NASA's Office of Small Business Programs in Washington, joined Bolden in presenting the award to Marshall Center Director Robert Lightfoot. "I am extremely proud of the Marshall small business team, and its dedication to nurturing the small business partners and enterprises that are key to the success of our programs and projects," Lightfoot said. "To be recognized twice in three years for that dedication reflects the strength of our small business program, and our commitment to creating and maintaining the kind of mutually rewarding partnerships that will carry on NASA's mission into the next era of space exploration and discovery." Sponsored by the NASA Office of Small Business Programs, the award recognizes the winning center's implementation of successful, innovative practices that promote the participation of small businesses in helping NASA achieve its mission. It also honors the significant contributions of that center's senior management, procurement office and program and technical personnel to the agency's small business programs.
RELEASE: 11-087 SUZAKU SHOWS CLEAREST PICTURE YET OF PERSEUS GALAXY CLUSTER
WASHINGTON -- X-ray observations made by the Suzaku observatory provide the clearest picture to date of the size, mass and chemical content of a nearby cluster of galaxies. The study also provides the first direct evidence that million-degree gas clouds are tightly gathered in the cluster's outskirts. Suzaku is sponsored by the Japan Aerospace Exploration Agency (JAXA) with contributions from NASA and participation by the international scientific community. The findings will appear in the March 25 issue of the journal Science. Galaxy clusters are millions of light-years across, and most of their normal matter comes in the form of hot X-ray-emitting gas that fills the space between the galaxies. "Understanding the content of normal matter in galaxy clusters is a key element for using these objects to study the evolution of the universe," explained Adam Mantz, a co-author of the paper at NASA's Goddard Space Flight Center in Greenbelt, Md. Clusters provide independent checks on cosmological values established by other means, such as galaxy surveys, exploding stars and the cosmic microwave background, which is the remnant glow of the Big Bang. The cluster data and the other values didn't agree. NASA's Wilkinson Microwave Anisotropy Probe (WMAP) explored the cosmic microwave background and established that baryons -- what physicists call normal matter -- make up only about 4.6 percent of the universe. Yet previous studies showed that galaxy clusters seemed to hold even fewer baryons than this amount. Suzaku images of faint gas at the fringes of a nearby galaxy cluster have allowed astronomers to resolve this discrepancy for the first time. The satellite's ideal target for this study was the Perseus Galaxy Cluster, which is located about 250 million light-years away and named for the constellation in which it resides. It is the brightest extended X-ray source beyond our own galaxy, and also the brightest and closest cluster in which Suzaku has attempted to map outlying gas. "Before Suzaku, our knowledge of the properties of this gas was limited to the innermost parts of clusters, where the X-ray emission is brightest, but this left a huge volume essentially unexplored," said Aurora Simionescu, the study's lead researcher at the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) at Stanford University. In late 2009, Suzaku's X-ray telescopes repeatedly observed the cluster by progressively imaging areas farther east and northwest of the center. Each set of images probed sky regions two degrees across -- equivalent to four times the apparent width of the full moon or about 9 million light-years at the cluster's distance. Staring at the cluster for about three days, the satellite mapped X-rays with energies hundreds of times greater than that of visible light. From the data, researchers measured the density and temperature of the faint X-ray gas, which let them infer many other important quantities. One is the so-called virial radius, which essentially marks the edge of the cluster. Based on this measurement, the cluster is 11.6 million light-years across and contains more than 660 trillion times the mass of the sun. That's nearly a thousand times the mass of our Milky Way galaxy. The researchers also determined the ratio of the cluster's gas mass to its total mass, including dark matter -- the mysterious substance that makes up about 23 percent of the universe, according to WMAP. By virtue of their enormous size, galaxy clusters should contain a representative sample of cosmic matter, with normal-to-dark-matter ratios similar to WMAP's. Yet the outer parts of the Perseus cluster seemed to contain too many baryons, the opposite of earlier studies, but still in conflict with WMAP. To solve the problem, researchers had to understand the distribution of hot gas in the cluster, the researchers say. In the central regions, the gas is repeatedly whipped up and smoothed out by passing galaxies. But computer simulations show that fresh infalling gas at the cluster edge tends to form irregular clumps. Not accounting for the clumping overestimates the density of the gas. This is what led to the apparent disagreement with the fraction of normal matter found in the cosmic microwave background. "The distribution of these clumps and the fact that they are not immediately destroyed as they enter the cluster are important clues in understanding the physical processes that take place in these previously unexplored regions," said Steve Allen at KIPAC, the principal investigator of the Suzaku observations. Goddard supplied Suzaku's X-ray telescopes and data-processing software, and it continues to operate a facility that supports U.S. astronomers who use the spacecraft. Suzaku (Japanese for "red bird of the south") is the fifth Japanese X-ray astronomy satellite. It was launched as Astro-E2 on July 10, 2005, and renamed in orbit. The observatory was developed at JAXA's Institute of Space and Astronautical Science in collaboration with NASA and other Japanese and U.S. institutions.
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