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Dwarf galaxies being digested by bigger spiral galaxies
« on: September 08, 2010, 10:22:52 AM »
Astronomers have spotted the tell-tale signs of so-called dwarf galaxies being digested by bigger spiral galaxies.

Spiral galaxies are known to grow by swallowing their diminutive neighbours; as this process occurs, the dwarf galaxies become severely distorted.

An international team have now observed the characteristic signs of this process occurring in distant galaxies, beyond our cosmic neighbourhood.

The findings are published in the Astronomical Journal.
Stellar stream - Jon Lomberg The observations could shed further light on galaxy evolution

The researchers say the findings could shed further light on the evolution of galaxies.

As dwarf galaxies are digested by spirals, they form tendril-like structures and so-called stellar streams - long filaments of stars produced by the stretching action of tidal forces.

Astronomers have been observing such events in our immediate cosmic neighbourhood, known as the "Local Group" of galaxies, for more than a decade.

But the Local Group, with its three spiral galaxies, is much too small a sample to determine how common this process might be in the rest of the Universe. - BBC

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