Very Long Base Interferometry (VLBI) in space and X-ray observations of compact sources in active galactic nuclei

Details Very Long Base Interferometry (VLBI) in space and X-ray observations of compact sources in active galactic nuclei Very Long Base Interferometry (VLBI) in space and X-ray observations of compact sources in active galactic nuclei

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.213..157b&link_type=abstract

In ESA QUASAT: A VLBI Obs. in Space p 157-159 (SEE N85-16700 07-88)

Astronomy and Astrophysics

Astronomy

Active Galactic Nuclei, Radio Astronomy, Spaceborne Astronomy, Very Long Base Interferometry, X Ray Astronomy, Brightness Temperature, Compton Effect, Quasat, Synchrotron Radiation

Scientific paper

The combination of very high resolution radio data with X-ray data to study active galactic nuclei is discussed. Very compact emission in radio and mm wavelengths comes from self-absorbed synchrotron emission limited by inverse Compton emission in X-rays. This limit translates into a brightness temperature limit of 10 to the 12th power K. Sources near this brightness temperature require high spatial resolution and baselines larger than the diameter of the Earth. Hence to test the limit requires QUASAT. A more precise test can be made by comparing predicted and observed X-ray flux densities from the inverse Compton emission. This requires X-ray flux densities and X-ray spectra, e.g., from the EINSTEIN data bank and from EXOSAT. The X-ray surveys of the X-ray satellite ROSAT with sensitivities reaching 1.2 nJy (at 1 keV) in the deep survey will provide the best match for space VLBI from QUASAT.

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