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References in periodicals archive ?
The Sagittarius Dwarf Galaxy is much too large and dispersed to see visually, but M54 gains new luster once you know of its extragalactic origin.
So far, however, the association of the snail shell feature with the Sagittarius dwarf galaxy is based on simple computer models and analyses.
Tom Polakis' motion studies suggest that Palomar 12 may have originated in the Sagittarius Dwarf Galaxy, but was probably later captured by the Milky Way.
The Sagittarius dwarf galaxy used to be one of the brightest of the Milky Way satellites, and its disrupted remnant now lies on the other side of the Galaxy, breaking up as it is crushed and stretched by huge tidal forces.
When astronomers discovered the galaxy Segue 1 in 2007, they weren't sure if it was anything more than a cluster of stars, perhaps stripped from the nearby Sagittarius dwarf galaxy. But observations with the Keck II telescope atop Hawaii's Mauna Kea now confirm the status of Segue 1 as a galaxy by showing that its stars have a diverse chemical makeup, Simon says.
The Sagittarius dwarf galaxy, now stretched into a thin stream that wraps around the Milky Way, careened into our galaxy several billion years ago.
He says "Perhaps the Sagittarius dwarf galaxy has suffered an encounter with an object in the game of Galactic billiards.
Those observations indicated the stars were all moving together and were a diverse group, rather than simply a cluster of similar stars that had been ripped out of the nearby and more star-rich Sagittarius dwarf galaxy. A competing group of astronomers at Cambridge University were, however, not convinced.
That's the conclusion of astronomers who have mapped the extent of the Sagittarius dwarf galaxy, one of two dwarf galaxies that the Milky Way's gravity is ripping apart (SN: 11/15/03, p.
Now, in an upcoming Astrophysical Journal issue, Marion Dierickx and Abraham Loeb (Harvard University) argue that some of these stars are probably members of what was once the Sagittarius dwarf galaxy.
Using observations of such tidal debris from a dwarf known as the Sagittarius Dwarf Galaxy, astronomers have been able to reconstruct the orbit of Sagittarius and derive models for the Milky Way and its dark-matter halo.