Fragile mega-galaxy is missing link in history of cosmos

Fragile mega-galaxy is missing link in history of cosmos
The image shows a close-up of the colliding galaxies in red and green. The red data show dust-enshrouded regions of star formation. The green data show gas in the merging galaxies. The blue spots are visible-light observations of galaxies located much closer to us. Credit: JPL-Caltech/UC Irvine/Keck Observatory/STScI/NRAO/SAO/ESA/NASA.

Two hungry young galaxies that collided 11 billion years ago are rapidly forming a massive galaxy about 10 times the size of the Milky Way, according to UC Irvine-led research published Wednesday in the journal Nature.

Capturing the creation of this type of large, short-lived star body is extremely rare – the equivalent of discovering a missing link between winged dinosaurs and , said the scientists, who relied on the once-powerful Herschel and observatories around the world. The new mega-galaxy, dubbed HXMM01, "is the brightest, most luminous and most gas-rich submillimeter-bright known," the authors write.

HXMM01 is fading away as fast as it forms, a victim of its own cataclysmic birth. As the two smashed together, they gobbled up huge amounts of hydrogen, emptying that corner of the universe of the star-making gas.

"These galaxies entered a feeding frenzy that would quickly exhaust the food supply in the following hundreds of million years and lead to the new galaxy's slow starvation for the rest of its life," said lead author Hai Fu, a UC Irvine postdoctoral scholar.

The discovery solves a riddle in understanding how giant elliptical galaxies developed quickly in the and why they stopped producing stars soon after. Other astronomers have theorized that giant in the heart of the galaxies blew strong winds that expelled the gas. But cosmologist Asantha Cooray, the UC Irvine team's leader, said that they and colleagues across the globe found definitive proof that cosmic mergers and the resulting highly efficient consumption of gas for stars are causing the quick burnout.

"Finding this type of galaxy is as important as the discovery of the archaeopteryx was in understanding dinosaurs' evolution into birds, because they were both caught at a critical transitional phase," Fu said.

The new galaxy was initially spotted by UC Irvine postdoctoral scholar Julie Wardlow, also with Cooray's group. She noticed "an amazing, bright blob" in images of the so-called cold cosmos – areas where gas and dust come together to form stars – recorded by the European Space Agency's Herschel telescope with important contributions from NASA's Jet Propulsion Laboratory in Pasadena. "Herschel captured carpets of galaxies, and this one really stood out."

Follow-up views at a variety of wavelengths were obtained at more than a dozen ground-based observatories, particularly the W. M. Keck Observatory in Hawaii.


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More information: Paper: dx.doi.org/10.1038/nature12184
Journal information: Nature

Citation: Fragile mega-galaxy is missing link in history of cosmos (2013, May 22) retrieved 23 September 2021 from https://phys.org/news/2013-05-fragile-mega-galaxy-link-history-cosmos.html
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