ACADEMIA
Japan's Subaru Telescope deploys 2400 new eyes on the sky to see cosmic rainbows
- Written by: Tyler O'Neal, Staff Editor
- Category: ACADEMIA
In addition to cameras, astronomers also use instruments known as spectrographs to study celestial objects. A spectrograph breaks the light from an object into its component colors, in other words, it creates a precise rainbow. Studying the strengths of the different colors in the rainbow from an object can tell astronomers various details about the object such as its motion, temperature, and chemical composition.
This new instrument, called PFS (Prime Focus Spectrograph), breaks visible light rainbows into two components: the red side and the blue side. So it might be more correct to refer to the data sets as half-rainbows. Combined with the third kind of detector which can see the infrared light invisible to humans, that makes one-and-a-half rainbows for an object studied with all three types of detectors.
Together with a widefield camera (HSC: Hyper Supreme-Cam), PFS will help launch the Subaru Telescope 2.0 project which will reveal the nature of dark matter and dark energy, structure formation in the Universe, and the physical processes of galaxy formation and evolution.