Artist’s impression of a galaxy surrounded by gravitational distortions due to dark matter. Galaxies live inside larger concentrations of invisible dark matter (colored purple in this image), however the dark matter’s effects can be seen by looking at the deformations of background galaxies. Credit: Swinburne Astronomy Productions – James Josephides

A small team of astronomers have found a new way to ‘see’ the elusive dark matter halos that surround galaxies, with a new technique 10 times more precise than the previous-best method. The work is published in Monthly Notices of the Royal Astronomical Society.

Scientists currently estimate that up to 85% of the mass in the universe is effectively invisible. This ‘dark matter’ cannot be observed directly, because it does not interact with light in the same way as the ordinary matter that makes up stars, planets, and life on Earth.

So how do we measure what cannot be seen? The key is to measure the effect of gravity that the dark matter produces.

Processed image of a spiral galaxy, as might be observed after lensing effects have distorted the galaxy’s true shape. By measuring the orbital motion of gas within a distant galaxy (seen here in pink), gravitational distortions can be measured much more precisely than was previously possible. Credit: Original image by ESA / Hubble & NASA / Flickr user Det58, image modification by Pol Gurri

Pol Gurri, the PhD student at Swinburne University of Technology who led the new research, explains: “It’s like looking at a flag to try to know how much wind there is. You cannot see the wind, but the flag’s motion tells you how strongly the wind is blowing.”

The new research focuses on an effect called weak gravitational lensing, which is a feature of Einstein’s general theory of relativity. “The dark matter will very slightly distort the image of anything behind it,” says Associate Professor Edward Taylor, who was also involved in the research. “The effect is a bit like reading a newspaper through the base of a wine glass.”

Weak gravitational lensing is already one of the most successful ways to map the dark matter content of the Universe. Now, the Swinburne team has used the ANU 2.3m Telescope in Australia to map how gravitationally lensed galaxies are rotating. “Because we know how stars and gas are supposed to move inside galaxies, we know roughly what that galaxy should look like,” says Gurri. “By measuring how distorted the real galaxy images are, then we can figure out how much dark matter it would take to explain what we see.”

Photograph of the Australian National University (ANU) 2.3m telescope at Siding Spring Observatory. Credit: Australian National University

The new research shows how this velocity information enables a much more precise measurement of the lensing effect than is possible using shape alone. “With our new way of seeing the dark matter,” Gurri says, “we hope to get a clearer picture of where the dark matter is, and what role it plays in how galaxies form.”

Future space missions such as NASA’s Nancy Grace Roman Space Telescope and the European Space Agency’s Euclid Space Telescope are designed, in part, to make these kinds of measurements based on the shapes of hundreds of millions of galaxies. “We have shown that we can make a real contribution to these global efforts with a relatively small telescope built in the 1980s, just by thinking about the problem in a different way,” adds Taylor.

Reference: “The first shear measurements from precision weak lensing” by Pol Gurri, Edward N Taylor and Christopher J Fluke, 21 September 2020, Monthly Notices of the Royal Astronomical Society.
DOI: 10.1093/mnras/staa2893

SciTechDaily: Home of the best science and technology news since 1998. Keep up with the latest scitech news via email or social media.

Researchers from CIERA and the Center for Astrophysics | Harvard & Smithsonian put a limit on the spin of the supermassive black hole in the…

Source: https://scitechdaily.com/astronomers-discover-new-way-to-see-elusive-dark-matter-halos/

Galaxy, Astronomy, Gravity, Dark matter halo, Research

World news – US – Astronomers Discover New Way to “See” Elusive Dark Matter Halos

En s’appuyant sur ses expertises dans les domaines du digital, des technologies et des process , CSS Engineering vous accompagne dans vos chantiers de transformation les plus ambitieux et vous aide à faire émerger de nouvelles idées, de nouvelles offres, de nouveaux modes de collaboration, de nouvelles manières de produire et de vendre.

CSS Engineering s’implique dans les projets de chaque client comme si c’était les siens. Nous croyons qu’une société de conseil devrait être plus que d’un conseiller. Nous nous mettons à la place de nos clients, pour aligner nos incitations à leurs objectifs, et collaborer pour débloquer le plein potentiel de leur entreprise. Cela établit des relations profondes et agréables.

Nos services:

  1. Création des sites web professionnels
  2. Hébergement web haute performance et illimité
  3. Vente et installation des caméras de vidéo surveillance
  4. Vente et installation des système de sécurité et d’alarme
  5. E-Marketing

Toutes nos réalisations ici https://www.css-engineering.com/en/works/

LEAVE A REPLY

Please enter your comment!
Please enter your name here