Exploring the Invisible Universe: A multi-wavelength view of galaxies and galaxy clusters
published: May 20, 2019, recorded: May 2019, views: 91
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Description
Galaxies are divided into two classes – actively, star forming spiral galaxies and red and “dead” elliptical galaxies. All massive galaxies host a supermassive black hole (SMBH) at their centers. In elliptical galaxies, these SMBHs drive energetic outbursts, powered by accreting matter, that govern the formation of new, young stars. While the central supermassive black hole likely plays a major role in controlling star formation, the black hole makes up only a very small fraction of the galaxy’s mass. In a massive elliptical galaxy, most of the mass lies in a dark matter halo, that is filled with hot (ten million degree) X-ray emitting gas. On larger scales, galaxies lie in groups or clusters, where the space between the galaxies is filled with very hot (hundred million degree), X-ray emitting gas. Although the mass of this diffuse hot gas is much larger than the mass of all the galaxies in the cluster, about 85% of the mass in galaxy clusters is dark matter. We discuss how X-ray observations of the hot gas, combined with optical and radio data, allow us to understand the outbursts of SMBHs and to trace the distribution of dark matter.
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A multi-wavelength view of galaxies and galaxy clusters offers a comprehensive and revealing perspective on the cosmos. By observing celestial objects across a range of wavelengths, from radio waves to X-rays and gamma rays, astronomers gain valuable insights into the various components and activities within galaxies and their larger gatherings, clusters. Each wavelength provides unique information, unveiling hidden phenomena such as active galactic nuclei, star formation, dark matter distribution, and more. This multi-wavelength approach not only deepens our understanding of the universe's complex processes but also serves as a powerful tool for mapping and unraveling the mysteries of these cosmic structures, contributing to our knowledge of the cosmos and its evolution.
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How interesting! The study of invisible regions of the Universe in different wavelength ranges - from radio to gamma rays - allows us to learn about hidden processes in galaxies and galaxy clusters. For example, X-ray and gamma-ray astronomy provide insight into hot gas and black holes in these objects. Radio observations reveal the cold gas-dust clouds from which new stars form.
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