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Showing posts with label galaxies. Show all posts
Showing posts with label galaxies. Show all posts

Hubble’s New Pictures

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The first snapshots from the refurbished Hubble showcase the 19-year-old telescope's new vision. Topping the list of exciting new views are colorful multi-wavelength pictures of far- flung galaxies, a densely packed star cluster, an eerie "pillar of creation," and a "butterfly" nebula.



**Butterfly emerges from stellar demise in Planetary Nebula NGC 6302. (Credit: NASA, ESA, and the Hubble SM4 ERO Team)**


With the release of these images, astronomers have declared Hubble a fully rejuvenated observatory. Sen. Barbara A. Mikulski, D-Md., unveiled the images at NASA Headquarters in Washington, D.C., on Sept. 9, 2009.


With its new imaging camera, Hubble can view galaxies, star clusters, and other objects across a wide swath of the electromagnetic spectrum, from ultraviolet to near-infrared light. A new spectrograph slices across billions of light-years to map the filamentary structure of the universe and trace the distribution of elements that are fundamental to life.The telescope's new instruments also are more sensitive to light and can observe in ways that are significantly more efficient and require less observing time than previous generations of Hubble instruments.


NASA astronauts installed the new instruments during the space shuttle servicing mission in May 2009. Besides adding the instruments, the astronauts also completed a dizzying list of other chores that included performing unprecedented repairs on two other science instruments.



**Hubble image - One among the largest ever produced with the Earth-orbiting observatory - shows gives the most detailed view so far of the entire Crab Nebula ever made. (Image credit: NASA, ESA and Jeff Hester (Arizona State University))**


Now that Hubble has reopened for business, it will tackle a whole range of observations. Looking closer to Earth, such observations will include taking a census of the population of Kuiper Belt objects residing at the fringe of our solar system, witnessing the birth of planets around other stars, and probing the composition and structure of the atmospheres of other worlds.


Peering much farther away, astronomers have ambitious plans to use Hubble to make the deepest-ever portrait of the universe in near-infrared light. The resulting picture may reveal never-before-seen infant galaxies that existed when the universe was less than 500 million years old. Hubble also is now significantly more well-equipped to probe and further characterize the behavior of dark energy, a mysterious and little-understood repulsive force that is pushing the universe apart at an ever-faster rate.


Source: JPL, ScienceDaily


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NASA Approves X-ray Space Mission

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NASA recently confirmed that the Nuclear Spectroscopic Telescope Array, or NuSTAR, mission will launch in August 2011. NuSTAR will carry the first high-energy X-ray focusing telescopes into orbit, providing a much deeper, clearer view of energetic phenomena such as black holes and supernova explosions than any previous instrument has provided in this region of the electromagnetic spectrum. 




              **Centaurus A (also known as NGC 5128) is a lenticular galaxy about 14 million light-years away in the   constellation Centaurus. It is one of the closest radio galaxies to Earth**

NuSTAR is a NASA Small Explorer mission led by Caltech, managed by JPL, and implemented by an international team of scientists and engineers. Fiona Harrison, a professor of physics and astronomy at Caltech, is the team's principal investigator. The official confirmation follows two years of detailed design and reviews that have enabled NASA to determine that the NuSTAR team is ready to build the flight hardware. For more information is online at www.nustar.caltech.edu.


Source: JPL

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Mirror Cast for Mexican 6.5-meter Infrared Telescope

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A Collaboration among two U.S. and two Mexican research groups has begun to create the San Pedro Mártir Telescope, which will offer an unprecedented view of the infrared night sky.


** Casting team members at the Steward Observatory Mirror Lab loading 22,500 pounds of E6 Ohara borosilicate glass into the 6.5-meter honeycomb mold for the San Pedro Mártir Telescope mirror. Ray Bertram, Steward Observatory, University of Arizona**

With the casting of a 6.5-meter mirror in Arizona August 26, Mexican and American astronomers have taken the first step toward creating a new telescope that will survey infrared objects in the northern sky with unprecedented sensitivity.

The new mirror is destined for the planned San Pedro Mártir Telescope, which is expected to be built at the San Pedro Mártir Observatory in Baja California, Mexico.

When completed in 2017, the telescope will begin the Synoptic All-Sky Infrared Imaging Survey (SASIR) to look for faint infrared sources — ranging from dim, nearby stars to distant quasars — and flashes of infrared light from supernovae and other transient sources.

"Baja has a long tradition of telescopes, and the San Pedro Mártir Observatory is one of the best observatories in the world," said Joshua Bloom, principal investigator for SASIR and an associate professor of astronomy at the University of California, Berkeley. "Now, we hope to build on the top of the mountain the world's largest telescope dedicated to infrared astronomy."

Project partners are the Universidad Nacional Autonoma de Mexico (UNAM), the University of California, the Instituto Nacional de Astrofisica, Optica y Electronica (INAOE), and the University of Arizona in Tucson.

The estimated cost of the telescope, $200 million, must be raised from private sources or from U.S. or Mexican government funding agencies. UNAM is opening a project office in Mexico City next month, and Bloom is optimistic that money for a preliminary design can be raised by the end of the year, with continued funding to enable ground breaking in 2013. The all-sky infrared survey should start in 2017 and last 4 to 5 years.

"With this unique combination of telescope size, infrared design and survey strategy, SASIR will help us discover everything from the Sun's nearest neighbours to the most distant black holes in the universe," Bloom said. "We believe that SASIR will have a tremendous scientific impact across all fields of astronomy."



 
**Before being filled with glass, the mirror mold is loaded with 1,020 hexagonal cores. The cores will be removed after several months, when the mirror blank has cooled and been lifted off the furnace hearth, leaving the voids of the honeycomb glass structure. Ray Bertram, Steward Observatory, University of Arizona**
 
"This is a great scientific project which will fully exploit the superb characteristics of the San Pedro Mártir site," said Jose Franco, director of UNAM's National Institute of Astronomy.

The project began in earnest with the casting August 26 of a "honeycomb" sandwich mirror 21.3 feet (6.5 meters) in diameter by the University of Arizona Steward Observatory Mirror Laboratory in Tucson. The mold inside the 2156° Fahrenheit (1180° Celsius) giant rotating furnace holds 22,500 pounds (10,200 kilograms) of E6 low expansion borosilicate glass produced by the Ohara Corporation in Japan. The furnace will spin at 7.4 revolutions per minute for 3 days so that the mirror achieves the desired focal ratio, f/1.25.

The mirror is made by flowing molten glass between 1,020 alumina-silica hexagonal hollow core boxes inside the tub mold. The hexagonal cores will be removed months from now, after the mirror blank has cooled and lifted off the furnace hearth, leaving the voids of the honeycomb glass structure. After cleaning, the finished honeycomb mirror will weigh an estimated 18,500 pounds (8,400 kg).

When equipped with the SASIR camera bearing the largest collection of infrared detectors to date, the San Pedro Mártir Telescope will offer an unprecedented view of the infrared night sky, Bloom said. The telescope will be able to detect objects 100 to 500 times fainter than the best infrared survey to date, the 5-year-old Two Micron All Sky Survey (2MASS).

The team hopes to find the most distant quasars, which are actively forming galaxies from the very early universe, and detect dim red stars that may comprise the missing mass in the neighbourhood of the Sun. SASIR may also find Earth-sized planets around dim stars.

"This is a remarkably strong collaboration between two U.S. and two Mexican research groups," said Jose Guichard, director general of INAOE. "The project, however, still welcomes other partners."



Provided by the University of California, Berkeley


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