Astronomers observe stars forming close to Milky Ways central black hole

January 6th, 2009 - 2:20 pm ICT by ANI  

Washington, Jan 6 (ANI): Astronomers have shown that stars can even form very close to the Milky Ways central black hole.

The center of our galaxy is wracked with powerful gravitational tides that are stirred by a 4 million solar-mass black hole.

Those tides should rip apart molecular clouds that act as stellar nurseries, preventing stars from forming in place.

But, using the Very Large Array of radio telescopes, astronomers from the Harvard-Smithsonian Center for Astrophysics and the Max Planck Institute for Radio Astronomy have identified two protostars located only a few light-years from the galactic center.

We literally caught these stars in the act of forming, said Smithsonian astronomer Elizabeth Humphreys.

The center of the Milky Way is a mysterious region hidden behind intervening dust and gas, making it hard to study.

Visible light doesnt make it out, leaving astronomers no choice but to use other wavelengths like infrared and radio, which can penetrate dust more easily.

Humphreys and her colleagues searched for water masers, which are radio signals that serve as signposts for protostars still embedded in their birth cocoons.

They found two protostars located seven and 10 light-years from the galactic center.

Combined with one previously identified protostar, the three examples show that star formation is taking place near the Milky Ways core.

Their finding suggests that molecular gas at the center of our galaxy must be denser than previously believed.

A higher density would make it easier for a molecular clouds self-gravity to overcome tides from the black hole, allowing it to not only hold together, but also collapse and form new stars.

The discovery of these protostars confirms recent theoretical work, in which a supercomputer simulation produced star formation within a few light-years of the Milky Ways central black hole.

We dont understand the environment at the galactic center very well yet, Humphreys said.

By combining observational studies like ours with theoretical work, we hope to get a better handle on whats happening at our galaxys core. Then, we can extrapolate to more distant galaxies, she added. (ANI)

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