We Really Need a Far-Infrared Space Interferometer. Here's Why

TL;DR

Dr. David Leisawitz proposes the development of a far infrared space-based interferometer to advance our understanding of the early universe, star and planet formation, and galaxy evolution.

Transcript

thanks to jwst we're getting an amazing view of the early Universe we're being able to see through the gas and dust to see newly forming planets and that's because it is an infrared Observatory it's able to see in the mid and near versions of infrared and then of course we've got other ground-based telescopes like Alma which are in the microwave an... Read More

Key Insights

• 🤩 Far infrared telescopes are crucial for understanding early universe phenomena, star and planet formation, and galaxy evolution.
• 🧑‍🌾 The far infrared range remains unobserved due to the absence of suitable telescopes, and the development of a far infrared interferometer would fill this gap.
• ⚡ Interferometers can combine the light from multiple telescopes to achieve high-angular resolution, enabling the observation of individual galaxies and fine structures within celestial objects.

Questions & Answers

Q: What is the difference between near, mid, and far infrared?

Near infrared refers to wavelengths just beyond those of visible light, mid-infrared lies between near and far infrared, and far infrared extends to longer wavelengths, penetrating through dust and revealing celestial objects emitting in this range.

Q: Why haven't far infrared telescopes been developed yet?

Historical far infrared telescopes including Herschel and Spitzer faced technical challenges and cost constraints. Currently, no telescopes observe in the far infrared from space due to the need to cool them to extremely low temperatures.

Q: Can far infrared telescopes be built on Earth?

Far infrared light cannot penetrate Earth's atmosphere, making it necessary to observe from space. While telescopes can be designed for far infrared observations on Earth, the limited windows where light can pass through restrict the overall coverage.

Q: How have cooling systems evolved for far infrared telescopes?

Past missions utilized expendable cryogens, such as liquid helium or hydrogen, to cool the telescope to about 80 Kelvin. However, new mechanical cryo coolers have been developed that can achieve temperatures as low as 4.5 Kelvin, providing longer lifetimes and improved sensitivity.

Summary & Key Takeaways

• The far infrared range, which lies between about 25 to 450 micrometers, is currently not observed due to the absence of suitable telescopes.

• Far infrared telescopes must be cooled to extremely low temperatures to minimize interference from their own emission and detect faint celestial objects.

• Building an interferometer in the far infrared range would provide high-angular resolution and enable the observation of individual galaxies, protoplanetary disks, and early universe phenomena.