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Black hole wrangle ejects rogue stars

VANDERBILT(US) — Astronomers have identified nearly 700 new rogue stars that appear to have been ejected from the Milky Way.

It’s very difficult to knock a star out of the galaxy. In fact, the main mechanism that astronomers have come up with that can give a star the two-million-plus mile-per-hour kick it takes involves tangling with the supermassive black hole at the galaxy’s core.

So far astronomers have found 16 of these “hypervelocity” stars. Although they are traveling fast enough to eventually escape galaxy’s gravitational grasp, they have been discovered while they are still inside the galaxy.

As reported in the Astronomical Journal researchers based the new findings on the stars’ location in intergalactic space between the Milky Way and the nearby Andromeda galaxy and by their peculiar red color.

“These stars really stand out. They are red giant stars with high metallicity which gives them an unusual color,” says Kelly Holley-Bockelmann, assistant professor in physics and astronomy at Vanderbilt University, who conducted the study with graduate student Lauren Palladino.

In astronomy and cosmology, “metallicity” is a measure of the proportion of chemical elements other than hydrogen and helium that a star contains. In this case, high metallicity is a signature that indicates an inner galactic origin: Older stars and stars from the galactic fringes tend to have lower metallicities.

The researchers identified these candidates by analyzing the millions of stars catalogued in the Sloan Digital Sky Survey.

“We figured that these rogue stars must be there, outside the galaxy, but no one had ever looked for them. So we decided to give it a try,” says Holley-Bockelmann, who is studying the behavior of the black hole at the center of the Milky Way galaxy.

Astronomers have now found evidence for giant black holes at the centers of many galaxies. They estimate that the Milky Way’s central black hole has a mass of four million solar masses. They calculate that the gravitational field surrounding such a supermassive black hole is strong enough to accelerate stars to hypervelocities.

The typical scenario involves a binary pair of stars that get caught in the black hole’s grip. As one of the stars spirals in towards the black hole, its companion is flung outward at a tremendous velocity.

A second scenario takes place during periods when the central black hole is in the process of ingesting a smaller black hole. Any star that ventures too close to the circling pair can also get a hypervelocity kick.

Red giant stars are the end stage in the evolution of small, yellow stars like the Sun. So, the stars in Holley-Bockelmann’s rogues gallery should have been small stars like the Sun when they tangled with the central black hole.

As they traveled outward, they continued to age until they reached the red giant stage. Even traveling at hypervelocities, it would take a star about 10 million years to travel from the central hub to the spiral’s edge 50,000 light years away.

“Studying these rogue stars can provide us with new insights into the history and evolution of our home galaxy,” says Holley-Bockelmann. The researchers next step is determine if any of their candidates are unusually red brown dwarfs instead of red giants. Because brown dwarfs produce a lot less light than red giants, they would have to be much closer to appear equally bright.

Researchers at California Institute of Technology, Case Western Reserve University, Penn State, and Youngstown State University contributed to the research, which was funded by the National Science Foundation and the Department of Education’s Graduate Assistance in Areas of National Need fellowship.

More news from Vanderbilt University: http://news.vanderbilt.edu/research/

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