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The relaxation techniques of galaxy clusters

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Created: Monday, 06 February 2023 00:06

How do you relax? With a quick ski descent on a black slope or with a good book in front of the fireplace? Each has its own techniques and even galaxy clusters have more than one.

The study of the dynamic structure of galaxy clusters provides information on their formation and evolution mechanisms. A useful indicator of this structure is the phase space mass density (hereinafter PSD) profile, i.e. the amount of mass per unit of spatial volume and velocity as a function of distance from the center of the cluster.

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The unexplored world of MINCE: Abundances of neutron capture elements where no one is looking

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Created: Friday, 27 January 2023 00:06

Only chemical elements up to iron can be formed inside stars by nuclear fusion. Heavier elements such as lead, gold, or uranium are produced thanks to neutron capture; for this reason, these elements are known as neutron-capture elements.
We can distinguish at least two production channels of heavy elements: the one called "slow process" (s-process), linked to captures that are slow compared to the beta decay time of the unstable isotopes that are formed; and "rapid process" (r-process) in which several captures occur before beta decay has time to act.
For the s-process we have in-depth knowledge of who the main actor is, i.e. stars of small masses during the last stages of their life.

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Pile-up in the "Bullet cluster"

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Created: Monday, 05 December 2022 00:06

The "Bullet cluster" is perhaps the most famous cluster of galaxies in the universe. Its main feature is the presence of a group of galaxies that have passed through it like a bullet, dragging along the hot gas that permeates the whole cluster. Unlike the gas, the cluster's mass distribution was unaffected by the collision with the group, which strengthens the hypothesis that most of the cluster's mass is in the form of non-collisional dark matter.

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The interesting case of QSO J2310+1855

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Created: Saturday, 20 August 2022 00:06

The early stages of galaxy formation and evolution are full of the most intriguing mysteries. How were supermassive black holes able to form in a very short time-scale (<1 billion years)? What was formed first, the black hole at the center of the galaxy or the galaxy itself? What are the properties of galaxies at the early phases of their evolution? How and how much does the black hole at the center of the galaxy influence the evolution of its host galaxy, do they co-evolve or does one dominate the other?

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  5. From Dawn till Dusk

 

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