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Hundreds of Young Galaxies in Early Universe


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#1    Waspie_Dwarf

Waspie_Dwarf

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Posted 22 September 2006 - 02:23 PM

NASA's Hubble Finds Hundreds of Young Galaxies in Early Universe

The NASA / Space Telescope Science Institute press release is reproduced below:
  
FOR RELEASE: 10:00am (EDT) September 21, 2006

Erica Hupp/Dwayne Brown
Headquarters, Washington
(Phone: 202-358-1237/1726)

Donna Weaver
Space Telescope Science Institute, Baltimore, Md.
(Phone: 410/338-4493; E-mail: dweaver@stsci.edu)

Lars Lindberg Christensen
Hubble/ESA, Garching, Germany
(Phone: 011-49-89-3200-6306; Cell: 011-49-173-3872-621; E-mail: lars@eso.org)

PRESS RELEASE NO.: STScI-PR06-12

NASA'S HUBBLE FINDS HUNDREDS OF YOUNG GALAXIES IN EARLY UNIVERSE

Astronomers analyzing two of the deepest views of the cosmos made with NASA's Hubble Space Telescope have uncovered a gold mine of galaxies, more than 500 that existed less than a billion years after the Big Bang. These galaxies thrived when the cosmos was less than 7 percent of its present age of 13.7 billion years. This sample represents the most comprehensive compilation of galaxies in the early universe, researchers said.

The discovery is scientifically invaluable for understanding the origin of galaxies, considering that just a decade ago early galaxy formation was largely uncharted territory. Astronomers had not seen even one galaxy that existed when the universe was a billion years old, so finding 500 in a Hubble survey is a significant leap forward for cosmologists.

The galaxies unveiled by Hubble are smaller than today's giant galaxies and very bluish in color, indicating they are ablaze with star birth. The images appear red because of the galaxies' tremendous distance from Earth. The blue light from their young stars took nearly 13 billion years to arrive at Earth. During the journey, the blue light was shifted to red light due to the expansion of space.

"Finding so many of these dwarf galaxies, but so few bright ones, is evidence for galaxies building up from small pieces merging together as predicted by the hierarchical theory of galaxy formation," said astronomer Rychard Bouwens of the University of California, Santa Cruz, who led the Hubble study.

Bouwens and his team spied these galaxies in an analysis of the Hubble Ultra Deep Field (HUDF), completed in 2004, and the Great Observatories Origins Deep Survey (GOODS), made in 2003. The results were presented on August 17 at the 2006 General Assembly of the International Astronomical Union, and will be published in the November 20 issue of the Astrophysical Journal.

The findings also show that these dwarf galaxies were producing stars at a furious rate, about ten times faster than is happening now in nearby galaxies. Astronomers have long debated whether the hottest stars in early star-forming galaxies, such as those in this study, may have provided enough radiation to reheat the cold hydrogen gas that existed between galaxies in the early universe. The gas had been cooling since the Big Bang.

"Seeing all of these starburst galaxies provides evidence that there were enough galaxies 1 billion years after the Big Bang to finish reheating the universe," explained team member Garth Illingworth of the University of California, Santa Cruz. "It highlights a period of fundamental change in the universe, and we are seeing the galaxy population that brought about that change."

In terms of human lifetimes, cosmic events happen very slowly. The evolution of galaxies and stars, for example, occurs over billions of years. Astronomers, therefore, rarely witness dramatic, relatively brief transitions that changed the universe. One such event was the universe's "reheating." The reheating, driven by the galaxies' ultraviolet starlight, transformed the gas between galaxies from a cold, dark hydrogen soup to a hot, transparent plasma over only a few hundred million years. With Hubble's help, astronomers are now beginning to see the kinds of galaxies that brought about the reheating.

Just a few years ago, astronomers did not have the technology to hunt for faraway galaxies in large numbers. The installation of the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope in 2002 allowed astronomers to probe some of the deepest recesses of our universe. Astronomers used the ACS to observe distant galaxies in the HUDF and GOODS surveys.

Another major step in the exploration of the universe's earliest years will occur if Hubble undergoes its next upgrade with the Wide Field Planetary Camera 3 (WFC3). The WFC3's infrared sensitivity will allow it to detect galaxies that are so far away their starlight has been stretched to infrared wavelengths by the expanding universe.

The galaxies uncovered so far promise that many more galaxies at even greater distances are awaiting discovery by the James Webb Space Telescope (JWST), scheduled to launch in 2013. "With JWST, we will probe the dawn of galaxy formation to see the imprint of the first objects to form in the universe," Illingworth said.

The members of the science team are Rychard Bouwens and Garth Illingworth (University of California, Santa Cruz), John Blakeslee (Washington State University), and Marijn Franx (Leiden University).

For more information, contact:

Rychard Bouwens, University of California, Santa Cruz, California,
(phone) 831-459-5276, (e-mail) bouwens@ucolick.org

Garth Illingworth, University of California, Santa Cruz, California,
(phone) 831-459-2843, (e-mail) gdi@ucolick.org

John Blakeslee, Washington State University, Pullman, Washington,
(phone) 509-335-2414, (e-mail) jblakes@wsu.edu and

Marijn Franx, Leiden Observatory, Leiden, Netherlands,
(phone) 011-31-71-5275870, (e-mail) franx@strw.leidenuniv.nl


Source: NASA/STScI press release

"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001

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#2    Waspie_Dwarf

Waspie_Dwarf

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Posted 22 September 2006 - 02:32 PM

Distant Galaxies in the Hubble Ultra Deep Field

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This Hubble Space Telescope image shows 28 of the more than 500 young galaxies that existed when the universe was less than 1 billion years old. The galaxies were uncovered in a study of two of the most distant surveys of the cosmos, the Hubble Ultra Deep Field (HUDF), completed in 2004, and the Great Observatories Origins Deep Survey (GOODS), made in 2003.

Just a few years ago, astronomers had not spotted any galaxies that existed significantly less than 1 billion years after the Big Bang. The galaxies spied in the HUDF and GOODS surveys are blue galaxies brimming with star birth.

The large image at left shows the Hubble Ultra Deep Field, taken by the Hubble telescope. The numbers next to the small boxes correspond to close-up views of 28 of the newly found galaxies at right. The galaxies in the postage-stamp size images appear red because of their tremendous distance from Earth. The blue light from their young stars took nearly 13 billion years to arrive at Earth. During the journey, the blue light was shifted to red light due to the expansion of space.


Credit: NASA, ESA, R. Bouwens and G. Illingworth (University of California, Santa Cruz)

Image Type: Astronomical/Illustration
STScI-PRC2006-12


Source: HubbleSite - Newsdesk

"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001

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#3    Waspie_Dwarf

Waspie_Dwarf

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Posted 22 September 2006 - 02:34 PM

The Hubble Ultra Deep Field

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This view of nearly 10,000 galaxies is called the Hubble Ultra Deep Field. The snapshot includes galaxies of various ages, sizes, shapes, and colors. The smallest, reddest galaxies may be among the most distant known, existing when the universe was just about 800 million years old. The nearest galaxies - the larger, brighter, well-defined spirals and ellipticals - thrived about 1 billion years ago, when the cosmos was 13 billion years old. The image required 800 exposures taken over the course of 400 Hubble orbits around Earth. The total amount of exposure time was 11.3 days, taken between Sept. 24, 2003 and Jan. 16, 2004.


Credit: NASA, ESA, and S. Beckwith (STScI) and the HUDF Team

Image Type: Astronomical


Source: HubbleSite - Newsdesk

Edited by Waspie_Dwarf, 22 September 2006 - 02:38 PM.

"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001

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#4    Waspie_Dwarf

Waspie_Dwarf

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Posted 22 September 2006 - 02:35 PM

Individual Galaxy Details

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Astronomers analyzing two of the deepest views of the cosmos made with NASA's Hubble Space Telescope have uncovered a gold mine of galaxies, more than 500 that existed less than a billion years after the Big Bang. These galaxies thrived when the cosmos was less than 7 percent of its present age of 13.7 billion years. This sample, of which 28 are seen here, represents the most comprehensive compilation of galaxies in the early universe. The galaxies appear red because of their tremendous distance from Earth. The blue light from their young stars took nearly 13 billion years to arrive at Earth. During the journey, the blue light was shifted to red light due to the expansion of space.


Credit: NASA, ESA, R. Bouwens and G. Illingworth (University of California, Santa Cruz)

Image Type: Astronomical/Illustration


Source: HubbleSite - Newsdesk

Edited by Waspie_Dwarf, 22 September 2006 - 02:42 PM.

"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001

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#5    Waspie_Dwarf

Waspie_Dwarf

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Posted 22 September 2006 - 02:42 PM

Evolution of Galaxies

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Sampling galaxies through time and space.

Credit: NASA, ESA, and A. Feild (STScI)



Image Type: Illustration


Source: HubbleSite - Newsdesk

"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001

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#6    toc

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    Alien Embryo

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Posted 22 September 2006 - 09:27 PM

This ties even more in with my theory of creation, not based on the "Big Bang" but something similar. You will see if you find the time to look at it that the super giant red stars may well have formed these early galaxies and would also have produced enough background radiation to be picked up today as the 3K radiation detected.
Please at least copy the site below for when you can squeese it in.
I have two astronomers who quite like it up to now.





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