Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540418s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #404.18; Bulletin of the American Astronomical Society, Vol. 42, p.227
Astronomy and Astrophysics
Astronomy
Scientific paper
The radio galaxy M87 (Virgo A) offers a unique opportunity to study large-scale jet formation and very-high-energy (VHE) γ-ray emission from an active galactic nucleus. New estimates of the mass of the black hole at the center of M87 (6.4 billion solar masses) yields an apparent Schwarzschild radius of 8 microarcseconds. This size scale can be probed only by very long baseline interferometry (VLBI) at high frequencies. VLBI observations of M87 taken in April, 2009, used four antennae at three locations (Hawaii, California, Arizona) and observed at 230GHz (1.3mm) to achieve a fringe spacing of 60 microarcseconds. The resulting size estimates for the mm wavelength core of M87 set stringent constraints on the processes giving rise to the well-studied radio jet in this source. The impact on models of gamma-ray emission in the core of M87 is discussed.
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