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Water in the early universe
Date:12/18/2008

This release is available in German.

A research group led by graduate student Violette Impellizzeri from the Max Planck Institute for Radio Astronomy has used the 100 m Effelsberg radio telescope to detect water at the greatest distance from Earth so far. The water vapour was discovered in the quasar MG J0414+0534 at redshift 2.64, which corresponds to a light travel time of 11.1 billion years, a time when the Universe was only a fifth of the age it is today. The water vapour is thought to exist in clouds of dust and gas that feed the supermassive black hole at the centre of the distant quasar. The detection was later confirmed by high-resolution interferometric observations with the Expanded Very Large Array. The results of this work are published in the current edition of Nature (December 18, 2008).

The discovery of water in the early Universe was possible only due to the chance alignment of a foreground galaxy and the distant quasar MG J0414+0534. The foreground galaxy acts like a cosmic telescope, magnifying and distorting the light from the quasar forming four distinct images of the quasar. Without this gravitational lensing effect, 580 days of continuous observations with the 100 m telescope would have been needed instead of the 14 hours used to make this remarkable discovery. "Others have tried and failed to find water, and we knew we were looking for a very faint signal", says Violette Impellizzeri, "so we thought of using a foreground galaxy like a cosmic magnifying glass to observe at a far greater distance and had to be persistent, and sure enough the line emission of water popped up."

The detection of water from MG J0414+0534 with the Effelsberg radio telescope also occurred thanks to a touch of fortune. The object is within just the right redshift interval to stretch the line emission of the H2O molecule from its origina
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Contact: Dr. Violette Impellizzeri
vimpelli@nrao.edu
434-244-6811
Max-Planck-Gesellschaft
Source:Eurekalert  

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