منابع مشابه
Measurement of the radiation from thermal and nonthermal radio sources
The widespread use of the internet has enabled complex instrumentation to be available remotely and made it possible for students to use facilities to which they might otherwise not have access. Internet access to radio astronomical observatories, including the 37 m radio telescope at the Massachusetts Institute of Technology Haystack Observatory, has opened up new possibilities for undergradua...
متن کاملThermal and Nonthermal Emission from the Nearby Galaxy M33
A multi-wavelength study of radio and IR emission from the nearby galaxy M33 is presented. We focus on three main topics: 1) energy sources of IR emission and its correlation with radio continuum emission at different spatial scales, 2) separation of thermal and nonthermal components of the radio continuum emission without assuming a constant nonthermal spectral index, and 3) distribution of th...
متن کاملHybrid Thermal-Nonthermal Synchrotron Emission from Hot Accretion Flows
We investigate the effect of a hybrid electron population, consisting of both thermal and non-thermal particles, on the synchrotron spectrum, image size, and image shape of a hot accretion flow onto a supermassive black hole. We find two universal features in the emitted synchrotron spectrum: (i) a prominent shoulder at low (∼< 10 11 Hz) frequencies that is weakly dependent on the shape of the ...
متن کاملIR Emission from AGNs
Unified schemes of active galactic nuclei (AGN) require an obscuring dusty torus around the central engine. Torus sizes of hundreds of parsecs were deduced from early theoretical modeling efforts, but high-resolution IR observations now show that the torus size is no more than a few parsecs. This conflict is resolved when the clumpy nature of the torus is taken into account. The compact torus m...
متن کاملModel-based Estimation of Vertebrae from Uncalibrated Bi-Planar XRays
This paper presents a method and preliminary study for estimating the location of vertebrae from uncalibrated bi-planar radiographs. The method uses the axis/angle representation of rotations and exact analytic derivatives for optimising the objective function. Multiple vertebral models are incorporated in a single procedure. Results are shown on both real data in vivo and on simulated data. No...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s0074180900174819