In the Milky Way, shooting stars discovered black hole

23.07.2010

Paul KRASNOV


PHOTO: AP

The black hole at the center of the Milky Way — the galaxy in which the Solar System — from time to time, "shoots" into the surrounding space star, accelerated to incredible speeds. These conclusions were based on observations made with the space telescope Hubble, made by scientists at the Harvard-Smithsonian Center for Astrophysics in the U.S. state of Massachusetts.

According to a press release from NASA, the hypothesis that in the center of the Milky Way's monstrous "shooting" the black hole confirmed the observation of one of her running giperbystryh stars — HE 0437-5439. With a unique hardware Hubble astronomers have traced the star passes between the Earth and 11 distant galaxies. These observations allowed the authors of the study, published in the scientific journal The Astrophysical Journal Letters, specify the speed and trajectory of a celestial body.

Blue Star Class B, HE 0437-5439 per second overcomes 723 km, that is, its speed is 2.6 million kilometers per hour. Thus, it is three times faster than sun. Astronomers have tracked its trajectory and found that it starts right at the center of our galaxy.

Previously it was thought that HE 0437-5439 has arrived in the Milky Way galaxy from the next — Boolshogo Magellanic Cloud. In support of this hypothesis, in particular, pointed to a bright blue star — the life of such luminaries in astronomical terms is quite short — about 20 million years. This age HE 0437-5439 would be enough just to fly out of the cloud to the Milky Way.

These estimates, however, differ substantially with the publication in The Astrophysical Journal Letters, which the authors believe that HE 0437-5439 was "running" the black hole of about 100 million years ago. Along the way, experts had to explain how giperbystroy star which were to burn out soon after the "start" failed so far to keep its color.

The authors suggest that the original HE 0437-5439 was part of a system of three stars, to move towards the black hole. Once in its gravitational field, one of the three stars of the system was absorbed by the hole, and the other two related to each other by gravity, thrown with great speed. The second star evolved more quickly and HE 0437-5439, becoming a red giant, swallowed his "sister." Together they formed a celestial body that astronomers observed by the Space Telescope.

Giperbystrye stars like HE 0437-5439 — an extremely rare occurrence. Currently known only 16 such bodies. According to the calculations of astronomers, one giperbystruyu has 100,000,000 ordinary stars. However, according to the theory formulated more than 20 years ago, the black hole at the center of the Milky Way "shooting" stars quite often — about once every 100 million years.

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