Scientists discover mysterious ’space blob’ at cosmic dawnApril 23rd, 2009 - 1:02 pm ICT by ANI
Washington, April 23 (ANI): Using information from a suite of telescopes, astronomers have discovered a mysterious, giant ’space blob’ that existed at a time when the universe was only about 800 million years old.
Dubbed extended Lyman-Alpha blobs, such objects are huge bodies of gas that may be precursors to galaxies.
This blob was named Himiko for a legendary, mysterious Japanese queen, as it was discovered early in the history of the universe in a Japanese Subaru field.
It stretches for 55 thousand light years, a record for that early point in time. That length is comparable to the radius of the Milky Way’s disk.
But, researchers are puzzled by the object.
Even with superb data from the world’s best telescopes, they are not sure what it is.
Because it is one of the most distant objects ever found, its faintness does not allow the researchers to understand its physical origins.
It could be ionized gas powered by a super-massive black hole; a primordial galaxy with large gas accretion; a collision of two large young galaxies; super wind from intensive star formation; or a single giant galaxy with a large mass of about 40 billion Suns.
“The farther out we look into space, the farther we go back in time,” explained lead author Masami Ouchi, a fellow at the Observatories of the Carnegie Institution who led an international team of astronomers from the US, Japan, and the United Kingdom.
“I am very surprised by this discovery. I have never imagined that such a large object could exist at this early stage of the universe’s history,” Ouchi added.
“According to the concordance model of Big Bang cosmology, small objects form first and then merge to produce larger systems. This blob had a size of typical present-day galaxies when the age of the universe was about 800 million years old, only 6 percent of the age of today’s universe!” Ouchi further added.
No extended blobs have previously been found when the universe was younger.
Himiko is located at a transition point in the evolution of the universe called the reionization epoch.
It’s as far back as we can see to date, and at 55 thousand light years, Himiko is a big blob for that time.
“If this was the discovery of a class of objects that are ancestors of today’s galaxies, there should be many more smaller ones already found-a continuous distribution,” said Carnegie’s Alan Dressler, a member of the team. (ANI)
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Tags: accretion, age of the universe, bang cosmology, blob, carnegie institution, cosmic dawn, distant objects, faintness, giant galaxy, giant space, history of the universe, japanese queen, larger systems, lyman alpha, masami, massive black hole, mysterious space, observatories, physical origins, star formation