Title：Recent Results from the Nuclear Spectroscopic Telescope Array (NuSTAR) Galactic Plane Survey
Speaker：Prof. Charles Hailey (Columbia University in the City of New York)
Abstract：NuSTAR, launched in the summer of 2012, is the first, true focusing hard X-ray telescope to be employed in orbit. Operating in the 3-79 keV energy band, the twin NuSTAR telescopes provide 58" (HEW) angular resolution. The large area and good focusing provide sensitivity several orders of magnitude better than previous, non-focusing instruments. In this talk I will describe recent results from the NuSTAR Galactic Plane Survey (GPS). The GPS has intensively studied the central few degrees arond the Galactic Center (GC). Surveys of this region by NuSTAR have suggested that a large fraction (>~50%) of the ~9000 unidentified point sources discovered by Chandra are likely to be magnetic cataclysmic variables (mCV). More recent analysis of mCV sources observed by NuSTAR also suggests that the central hard X-ray emission (CHXE), discovered by NuSTAR, also has its primary origin in mCV. NuSTAR study of molecular clouds has greatly strengthened the argument for supermassive black hole outbursts ~ one century ago as the origin of the cloud hard X-ray emission, but puzzles do remain. NuSTAR study of X-ray emitting filaments in the Galactic Center reveal the most energetic cosmic-ray electrons in the galaxy, and combined with molecular cloud observations may provide great insight into the cosmic-ray energy budget of the GC. I will also describe the NuSTAR GPS legacy program, a series of major observations planned for the coming several years that will produce data sets solicited by, and immediately available to, the larger astrophysics community.
Time：7 Dec. (Wednesday), 16:00pm
Place：212 Room, Astronomy Building