1391 lines
101 KiB
HTML
1391 lines
101 KiB
HTML
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FAST has superior sensitivity to detect cosmic phenomena, including fast radio bursts and pulsars.
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Elizabeth Gibney
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data-track="download" data-track-label="PDF download">PDF version</a>
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<img class="figure__image" alt="The giant FAST project." data-src="//media.nature.com/lw800/magazine-assets/d41586-019-02790-3/d41586-019-02790-3_17178384.jpg">
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<noscript>
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<img class="" alt="The giant FAST project." src="//media.nature.com/lw800/magazine-assets/d41586-019-02790-3/d41586-019-02790-3_17178384.jpg">
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<figcaption>
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<p class="figure__caption sans-serif"><span class="mr10">FAST will enable highly sensitive measurements of astronomical phenomenon.</span><span>Credit: Ou Dongqu/Xinhua/ZUMA</span></p>
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</figure><p>The world’s largest single-dish radio observatory is preparing to open to astronomers around the world, ushering in an era of exquisitely sensitive observations that could help in the hunt for gravitational waves and probe the mysterious fleeting blasts of radiation known as <a href="https://www.nature.com/articles/d41586-019-02455-1" data-track="click" data-label="https://www.nature.com/articles/d41586-019-02455-1" data-track-category="body text link">fast radio bursts</a>.</p><p>The Five-hundred-meter Aperture Spherical Radio Telescope (FAST) in southern China has just passed a series of technical and performance assessments, and the Chinese government is expected to give the observatory the final green light to begin full operations at a review meeting scheduled for next month. “We do not see any roadblocks for the remaining transition,” says Di Li, the chief scientist of FAST. “I feel both excited and relieved.”</p><p>The complex project has not been without challenges — it has a radical design and initially struggled to attract staff, in part because of its remote location. But the pay-off for science will be immense. FAST will collect radio waves from an area twice the size of the next-largest single-dish telescope, the Arecibo Observatory in Puerto Rico. </p><p>The Chinese observatory’s massive size means that it can detect extremely faint radio-wave whispers from an array of sources across the Universe, such as the spinning cores of dead stars, known as pulsars, and hydrogen in distant galaxies. It will also explore a frontier in radioastronomy — using radio waves to locate exoplanets, which may harbour extraterrestrial life.</p><p>Since testing began in 2016, only Chinese scientists have been able to lead projects studying the telescope’s preliminary data. But now, observation time will be accessible to researchers from around the world, says Zhiqiang Shen, director of the Shanghai Astronomical Observatory and co-chair of the Chinese Academy of Sciences’ FAST supervisory committee.</p><p>“I’m super excited to be able to use the telescope,” says Maura McLaughlin, a radioastronomer at West Virginia University in Morgantown, who wants to use FAST to study pulsars, including hunting for them in galaxies outside the Milky Way, that are too faint to see with current telescopes.</p><p>During the testing phase, the telescope discovered more than 100 pulsars.</p><h2>Eye in the sky</h2><p>The 1.2-billion-yuan (US$171-million) telescope, also known as Tianyan or ‘Eye of Heaven’, took half a decade to build in the remote Dawodang depression in the Guizhou province of southwest China. Its 500-metre-wide dish is made up of around 4,400 individual aluminium panels that more than 2,000 mechanical winches tilt and manoeuvre to focus on different areas of the sky. Although it sees less of the sky than some other cutting-edge radio telescopes, and has lower resolution than multidish arrays, FAST’s size makes it uniquely sensitive, says Li.</p><p>In August and September, the instrument detected hundreds of bursts from a repeating fast radio burst (FRB) source known as 121102. Many of these bursts were too faint to be perceived by other telescopes, says Li. “This is very exciting news,” says Yunfan Gerry Zhang, who studies FRBs at the University of California, Berkeley. No one knows what causes the mysterious bursts, but “the more pulses we have, the more we can learn about them”, he says. </p><p>FAST examines only a tiny fraction of the sky at any one time, making it unlikely to discover many new FRBs, which are fleeting and occur in seemingly random locations. But the telescope’s “impressive sensitivity” will be useful for following up on sources in detail, says Laura Spitler, an astronomer at the Max Planck Institute for Radio Astronomy in Bonn, Germany. Repeat observations could allow scientists to learn about the environment from which an FRB emerged, and to determine whether the blasts vary in energy or recur with any set pattern.</p><p>FAST will also boost the efforts
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<p><span class="emphasis">Nature</span> <span><strong>574</strong>, 16-17 (2019)</span></p>
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<div class="emphasis">doi: 10.1038/d41586-019-02790-3</div>
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<h3 class="c-latest-content__title">How the fight over a Hawaii mega-telescope could change astronomy</h3>
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<p><span class="c-latest-content__content-type sans-serif">News</span> <span class="c-latest-content__date sans-serif"><time>14 JAN 20</time></span></p>
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<h3 class="c-latest-content__title">World’s largest radio telescope needs to hit US$1-billion target</h3>
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<h3 class="c-latest-content__title">A population of dust-enshrouded objects orbiting the Galactic black hole</h3>
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<p><span class="c-latest-content__content-type sans-serif">Article</span> <span class="c-latest-content__date sans-serif"><time>15 JAN 20</time></span></p>
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<h3 class="c-latest-content__title">How the fight over a Hawaii mega-telescope could change astronomy</h3>
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<p><span class="c-latest-content__content-type sans-serif">News</span> <span class="c-latest-content__date sans-serif"><time>14 JAN 20</time></span></p>
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<h3 class="c-latest-content__title">European space telescope to launch new era of exoplanet science</h3>
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Bevy of mysterious fast radio bursts spotted by Canadian telescope
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