New research reveals the Cosmic Web, a vast network of hydrogen filaments that strings the galaxies together.
New research has imaged the Cosmic Web of cold dark gas that interconnects the Universe's galaxies. Image Credit: Martin et al. 2023.
KCWI is a spectrograph, meaning it can measure light’s properties in the specific range of wavelengths it’s built to analyze. In KCWI’s case, it sees light from 350 nm to 560 nm, within the range of human vision. Inside that range, it can see what’s known as Lyman-alpha emissions.in neutral hydrogen.
For that research, Martin and his colleagues worked with the KCWI’s predecessor, the CWI. It was installed on the Palomar Observatory, and the KCWI is like an improved version of the CWI. In the 2015 discovery, the gas in the funnel was lit up by a quasar and was easier to observe. The Cosmic Web doesn’t jump out of the data and present itself. It takes some astrophysical sleuthing to filter it out of the data. Light from the hydrogen can be confused with light from other sources. But Martin devised a way to work through that.
Dark matter, of course, is the predominant type of matter in the Universe. Regular matter, called baryonic matter, makes up only a small percentage of the Universe’s matter. Everything we can see and interact with, including our own bodies, is made of regular baryonic matter. But we don’t really understand the Universe if we don’t understand dark matter. The name itself is just a placeholder. Nobody knows what it is.
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