Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19411501c&link_type=abstract
American Astronomical Society Meeting 194, #115.01
Other
Scientific paper
ARISE (Advanced Radio Interferometry between Space and Earth) is a space Very Long Baseline Interferometry (VLBI) mission consisting of one (or possibly two) 25-meter radio telescope(s) in a high elliptic Earth orbit. In conjunction with arrays of ground telescopes, ARISE will image the most energetic astronomical phenomena in the universe, namely supermassive black holes. The mission objectives are to image radio sources with a resolution of 10-20 microarcseconds, which corresponds to an improvement in resolution over today's Space VLBI mission by two orders of magnitude. ARISE's observing bands will be 8, 22, 43, (60), and 86 GHz, and system noise temperatures down to 10-20 K. Science data will be downlinked at a rate of 1-8 Gbps The ARISE spacecraft is placed in a high elliptical Earth orbit in order to synthesize the largest possible imaging aperture. The nominal orbit has a perigee altitude of 5000 km and an apogee altitude of 40000 km. The mission lifetime is approximately 3 years, with a potential start in 2005 and launch in 2008. The spacecraft launch mass is about 1700 kg, allowing for a launch to the desired orbit with a Delta II class launch vehicle. The primary goal of ARISE is the study of the environment of black holes and other compact objects, as well as the disks of matter surrounding these objects. Secondary goals are the studies of gravitational lenses throughout the universe, and of coronae in active stellar systems. Massive black holes are believed to be the power sources for active galactic nuclei, including the gamma-ray ``blazars" first detected by the Compton Gamma Ray Observatory. Among the questions of scientific interest are the method of feeding these black holes, and how they use the fuel to generate the light-speed jets seen in blazars. ARISE will image the region of primary energy deposition and delivery in these objects with a resolution of light days to light months, depending on the blazar distances. Observations at 43 and 86 GHz are required to image these regions in optically thin emission, so that our view is not restricted to an opaque surface. Imaging of these regions in polarized radiation will map out the inner magnetic field structures, required for understanding the energy-generation processes. The combination of the ARISE imaging with gamma-ray observations and X-ray spectroscopy is particularly important to provide a complete picture of the highly energetic phenomena near massive black holes.
Chmielewski A.
Ulvestad Jim
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