GC-IRS13E-A PUZZLING ASSOCIATION OF THREE EARLY-TYPE STARS

摘要: We present a detailed analysis of high-resolution near-infrared imaging and spectroscopy the potential star cluster IRS13E very close to massive black hole in Galactic center. detect 19 objects from Ks-band images, 15 which are also detected reliably H band. derive consistent proper motions for these two bands. Most share similar westward motion. characterize using (1.45-2.45 {mu}m) (narrowband) (1.66 L' band (3.80 {mu}m). Nine both Ks bands red, we find that they all with being warm dust clumps. The emission may be caused by colliding winds Wolf-Rayet stars cluster. Three six do not motion or spectral properties three bright stars. This leaves only bright, early-type as members. It is unlikely chance configuration. Assuming presence an intermediate mass (IMBH), about 14,000 M{sub sun} follows velocities positionsmore » However, our acceleration limits make such IMBH nearly occurrence association. Furthermore, there no variable X-ray source despite high density gas. Therefore, conclude hosts enough bind stars.« less