The second galactic center black hole found.

<P> Technology Channel (tech.) Message: Astrophysics Institute of Paris, France, scientist Jean - Pierre Mylar Stewart in the latest issue of "Astronomy and Astrophysics," published in the journal papers, announced that he led from France .and American scientists in joint research team, in the center of the galaxy where the solar system, "Ma A black hole" in the vicinity and found a second black hole. .The black hole is a medium-sized black hole, its quality is only "Pegasus A black hole" of 1 / 2000, equivalent to 1300 times the mass of the sun. .The new black hole from its older brother, "Ma A black hole" for 3 light years, and the speed of 280 kilometers per second in a spiral pattern around the "Pegasus A black hole" of rotation. .</ P> <P> black hole can not be directly observed, scientists are mainly based around it, the movement of stars in the cluster and determine the existence of black holes, and according to the cluster and the stars surrounding the black hole's gravity to calculate the black hole mass and other physical .parameters. .Mylar Stewart et al found that the galactic center black hole of the process of the second well. .</ P> <P> long time ago, astronomers discovered that there was a center of the galaxy bright spot, which they named IRS13 clusters. .Scientists initially thought that only one cluster in the IRS13 big stars, but their use in Hawaii, "Double Stars" radio telescope observed data, combined with Hubble, Chandra and other telescopes in space are measured .data, calculated after conclusion, IRS13 cluster has seven stars, these stars are attracted by a black hole, which found a new black hole center of our galaxy. .</ P> </ p>.