Scientists detect 13 billion-year old signal from ‘Cosmic Dawn' using Earth-based telescopes
The research led by Tobias Marriage, professor of physics and astronomy at Johns Hopkins University (JHU), is the first time ground-based observations have captured signals from the Cosmic Dawn. 'People thought this couldn't be done from the ground. Astronomy is a technology-limited field, and microwave signals from the Cosmic Dawn are famously difficult to measure,' Marriage was quoted as saying by the JHU website. 'Ground-based observations face additional challenges compared to space. Overcoming those obstacles makes this measurement a significant achievement,' he added.
According to the official JHU website, cosmic microwaves are barely millimetres in wavelength and are very hard to detect. The signal from polarised microwave light is about a million times fainter, making it much more difficult to trace. Meanwhile, on Earth, broadcast radio waves, radar and satellites can drown their signal, and changes in the atmosphere, weather and even temperature can distort it. The researchers claimed that even under perfect conditions, measuring this type of microwave would need highly sensitive equipment.
Scientists from the US National Science Foundation's Cosmology Larger Angular Scale Surveyor, or CLASS project, used telescopes that have been specifically designed to detect traces left by the first stars in the relic big bang light. This was previously only accomplished by technology deployed in space, such as the US National Aerospace and Space Administration Wilkinson Microwave Anisotropy Probe (WMAP) and European Space Agency Planck space telescopes.
As part of the project, the researchers compared the CLASS telescope data with data from the Planck and WMAP missions. They identified interference and narrowed in on a common signal from the polarised microwave light. Polarisation is when light waves collide into something and scatter.
'When light hits the hood of your car and you see a glare, that's polarisation. To see clearly, you can put on polarised glasses to take away glare,' said author Yunyang Li, who was a PhD student at Johns Hopkins and then a fellow at the University of Chicago during the research. 'Using the new common signal, we can determine how much of what we're seeing is cosmic glare from light bouncing off the hood of the cosmic dawn, so to speak.'
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