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NGC 1052-DF2, an ultra diffuse galaxy. An ultra diffuse galaxy (UDG), or dark galaxy, [1] is an extremely low luminosity galaxy, the first example of which was discovered in the nearby Virgo Cluster by Allan Sandage and Bruno Binggeli in 1984. [a] These galaxies have been studied for many years prior to their renaming in 2015. Their lack of ...
Right: A galaxy with a flat rotation curve that can be explained by the effects of dark matter. Deutsch: Links: Eine Galaxie mit einer Rotationskurve , wie sie durch die Keplerschen Gesetze vorrausgesagt wird, ohne die Annahme, dass Dunkle Materie existiert.
A dark galaxy is a hypothesized galaxy with no (or very few) stars. They received their name because they have no visible stars but may be detectable if they contain significant amounts of gas. Astronomers have long theorized the existence of dark galaxies, but there are no confirmed examples to date. [1]
Dragonfly 44 is an ultra diffuse galaxy in the Coma Cluster. [1] [3] [2] [4] This galaxy is well-known because observations of the velocity dispersion in 2016 suggested a mass of about one trillion solar masses, about the same as the Milky Way.
The simultaneous existence of the largest-known voids and galaxy clusters requires about 70% dark energy in the universe today, consistent with the latest data from the cosmic microwave background. [5] Voids act as bubbles in the universe that are sensitive to background cosmological changes.
Details from the HDF illustrate the wide variety of galaxy shapes, sizes and colors found in the distant universe. Deep field image taken by ALMA and Hubble. [14] The HDF data provided extremely rich material for cosmologists to analyse and by late 2014 the associated scientific paper for the image had received over 900 citations. [15]
As in all real images from our Arm of the galaxy much is obscured by the Great Rift, dark dust clouds that span from Cygnus to Centaurus. In astronomy , the Great Rift (sometimes called the Dark Rift or less commonly the Dark River ) is a dark band caused by interstellar clouds of cosmic dust that significantly obscure ( extinguish ) the center ...
The Perseus galaxy cluster is the brightest cluster in the sky when observed in the X-ray band. [3] The cluster contains the radio source 3C 84 that is currently blowing bubbles of relativistic plasma into the core of the cluster. These are seen as holes in an X-ray image of the cluster, as they push away the X-ray emitting gas.