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Sloan data yields biggest colour night-sky image ever

11 January 11 22:41
SDSS composite image showing magnifications (SDSS/M Blanton)
By Jason Palmer
Science and technology reporter, BBC News, Seattle

Astronomers have released the largest ever colour image of the whole sky, stitched from seven million images, each made of 125 million pixels.

The Sloan Digital Sky Survey's latest effort tops its own record, published publicly for professional astronomers and "citizen scientists" alike.

Data from Sloan has helped to identify hundreds of millions of cosmic objects.

The release was announced at the 217th annual meeting of the American Astronomical Society in Seattle, US.

Researchers have released an animation on YouTube demonstrating how the incredibly high-resolution image is represented on the celestial sphere.

Michael Blanton, a New York University physicist who presented the work on behalf of the Sloan team, told the conference that it was difficult to overstate the breadth of data Sloan provided.

"There's something like 3,500 papers that have been written on the basis of this data set," he said.

"A few dozen of them are being presented right now, this week at this meeting. They cover topics from the very smallest stars to the most massive black holes in the universe."

Nearly half a billion stars and galaxies have already been discovered and described thanks to Sloan images, and the new release is sure to significantly increase that number.

Sloan data is also behind the Google Sky service, which allows users to scan the heavens in the same way as scanning their local streets, and the Galaxy Zoo project, which has allowed astronomy enthusiasts to characterise galaxies from their own computers.

Digital record

The workhorse behind the data set, a camera comprising 125 million pixels that long held the record for highest-resolution camera in the world, has been retired.

Studies will now focus on spectrometry - unpicking new data on the basis of the colours of light that the upgraded equipment can detect.

They include:

But even the data that is already available, thanks to Tuesday's release, will keep astronomers of both the professional and the amateur variety busy.

"You can compare it to the National Geographic Palomar Survey of the late 1950s," Dr Blanton said.

"This is something that 50 years later is still a really important reference to astronomers; we use it ourselves to better understand our own images. SDSS is the digital version of that."

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