As you know now, in radio astronomy we study objects in the sky by catching radio waves. But what does that exactly mean? And what do radio astronomers see when they look at the sky? We will tell you all about that here.

Different types of radiation

You know now that there are different types of radiation which can be seen at different frequencies. Each radiation can be seen with different types of telescopes. Radio astronomers can look at different elements depending on the wavelengths they attempt to receive. If they study the same objects using different wavelengths, they will obtain images very different one from another, allowing different analyses.

In the image below you can see the different types of radiation (© NASA).

types of radiation

Crab Nevel

In the picture below, you see the Crab Nevel in different types of radiation. The Crab Nevel exploded 1000 years ago as a supernova. This was observed by the Chinese and was one of the first reports of a supernova. This nebula is about 6500 lightyears from Earth. As you can see the shape of the nebula is different in each type of radiation. You can also see different types of structures in the nebula. This gives us a lot of information about what is in the nebula.

Crab Nevel

Andromeda Galaxy

In the image below you see an image of the Andromeda Galaxy, also in different types of radiation. From the top left to the bottom right you see: Radio, far infrared, near-infrared, visible, ultra-violet and X-ray light.

Andromeda Galaxy

Cygnus A

Some galaxies were discovered in radio light first, such as Cygnus A (in the constellation of Swan, the strongest radio source, and one of the strongest sources in the sky). At high frequencies, we see a small dot in the middle, with two huge rays that end in some kind of dumbbell. This is not light as it is made in the sun (nuclear fusion), but light that arises because matter moves enormously fast in a magnetic field. This intensity can only occur if there is a black hole at the base.

Cygnus A

Latest tweets

How does a radio wave become a picture? Part II: Compact receivers. A radio wave that has travelled light years is picked up by a receiver on a telescope through an antenna. The (very weak) signal is then amplified and digitized. Read part 2 here: http://bit.ly/3aznntV

How does a radio wave become a picture? Planets, stars and nebula’s all emit radio waves, which are a form of invisible light waves. Read here the first part on what happens to those radio waves when they are received by a radio telescope! 📡🌠http://bit.ly/2YFDuQM

What's it like to work at ASTRON?
Project manager @PieterBenthem tells about his job, among which his work on the AAVS1 for the @SKA_telescope, of which LOFAR is a pathfinder project.
https://bit.ly/3bMKIv8

What's it like to work at ASTRON?
Project manager @PieterBenthem tells about his job, among which his work on the AAVS1 for the @SKA_telescope.
https://bit.ly/3bMKIv8

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