interacting galaxies

interacting galaxies

Two, three, or (more rarely) four or more galaxies that show signs of mutual disturbance, such as perturbed morphologies or extruded filaments of stellar material, called tidal tails, which can sometimes link to form bridges between the galaxies. Examples include the Antennae, Arp 220 and the Mice. Encounters of galaxies moving at low relative velocities are much more likely to produce mergers than fast encounters, where the interaction time is short and the galaxies pass through each other completely. The infrared satellite IRAS found that many interacting galaxies are powerful infrared sources: the interaction apparently stimulates star formation (see IRAS galaxies). There is also evidence that some radio-quiet QSO lie in interacting galaxies.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
Usually, interacting galaxies connect with a bridge of gas and dust, but in this case, the merger has just begun and there is no visible link in between.
Astronomers captured these two interacting galaxies, collectively known as ADFS-27, as they began the gradual process of merging into a single, massive elliptical galaxy.
Middle: Because compact galaxy groups frequently contain closely interacting galaxies, many of the entries in the Hickson catalog can also be found in Halton Arp's Atlas of Peculiar Galaxies (1966).
About 110 papers discuss such aspects as the evolution of giant molecular clouds in nearby galaxies, from large scale surveys of the galaxy to high resolution observations with ALMA, molecular gas properties and star formation in interacting galaxies, a study on the excitation mechanism of methyl formate in Orion KL using transitions in the vibrational excited states, and test observation of a new 100 GHz wave-band four-beam receiver system on the Nobeyama 45-meter telescope.
Astronomers and physicists are actively researching many subjects - exoplanets, black holes, interacting galaxies etc.
Washington, June 21 ( ANI ): The NASA/ESA Hubble Space Telescope has produced a vivid image of a pair of interacting galaxies known as Arp 142.
On a macroscopic scale, interacting galaxies often support extremely high star formation rates, leading to starbursts.
Specialists in different areas came to the conference to help put together an overview view of interacting galaxies, emphasizing the physics in relation to the galaxies' stage of evolution, morphological structure, interstellar matter, and stellar populations.
* Two interacting galaxies, each containing thousands of millions of stars, one poised vertically over the graceful spiral arms of another.
He notes that the separation among the quasars, about 100,000 light-years, is a distance typical of interacting galaxies.
We study the galaxies with both dark matter and without in SagDEG to investigate the effect of dark matter to the interacting galaxies. The aim of this project is to answer the question of whether dark matter in the SagDEG system prevents or aids in the disruption of the system (such as mass transfer), and how different the final distributions of stars are.

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