World-wide effort bringing ALMA telescope into reality

15 February, 2008

“Most of the photons in the Universe are in the wavelength range that ALMA will receive, and ALMA will give us our first high-resolution views at these wavelengths. This will be a tremendous advancement for astronomy and open one of our science’s last frontiers,” Anneila Sargent, a Caltech professor and ALMA Board member, told the American Association for the Advancement of Science at its meeting in Boston, Massachusetts.

The millimeter and submillimeter wavelength range lies between what is traditionally considered radio waves and infrared waves. ALMA, a system using up to 66 high-precision dish antennas working together, will provide astronomers with dramatically greater sensitivity, the ability to detect faint objects, and resolving power, the ability to see fine detail, than has ever before been available in this range.

“This ambitious project is the product of an international collaboration that spans the globe,” Sargent said. “ALMA truly will enable transformational science and providing this capability has required a massive, world-wide effort,” she added.

While scores of people are working at the ALMA site in Chile, more are in laboratories, test facilities, and factories around the world developing and producing equipment destined for ALMA. Antennas are coming from Europe, North America, and Japan. The giant transporter machines that will allow the antennas to be moved into multiple configurations have arrived in Chile from Germany. The prototype antennas and the prototype electronic equipment for ALMA have been tested at the site of the Very Large Array radio telescope in New Mexico. In Chile, buildings, roads and the complex infrastructure required to support ALMA operations all are coming together.

Groundbreaking for ALMA was held in 2003, and the project is scheduled for completion in 2012.

Astronomers expect ALMA to make extremely important contributions in a variety of scientific specialties. The new telescope system will be a premier tool for studying the first stars and galaxies that emerged from the cosmic “dark ages” billions of years ago. These objects now are seen at great cosmic distances, with most of their light stretched out to millimeter and submillimeter wavelengths by the expansion of the Universe.

In the more nearby Universe, ALMA will provide an unprecedented ability to study the processes of star and planet formation. Unimpeded by the dust that obscures visible-light observations, ALMA will be able to reveal the details of young, still-forming stars, and is expected to show young planets still in the process of developing. In addition, ALMA will allow scientists to learn in detail about the complex chemistry of the giant clouds of gas and dust that spawn stars and planetary systems.

Many other astronomical specialties also will benefit from the new capabilities of ALMA, In addition, “We know that every time in the past that a new wavelength region has been opened up, as ALMA will do, we have been surprised by entirely unexpected discoveries that significantly changed our understanding of the Universe. We also expect the unexpected from ALMA,” Sargent said.