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astro-ph1999
A Thin HI Circumnuclear Disk in NGC4261
H. J. van Langevelde, Y. M. Pihlstroem, J. E. Conway +2
We report on high sensitivity, spectral line VLBI observations of the HI absorption feature in the radio galaxy NGC4261. Although absorption is only detectable on the most sensitiv…
astro-ph1997
HST Detections of Massive Black Holes in the Centers of Galaxies
H. C. Ford, Z. I. Tsvetanov, L. Ferrarese +1
After correcting spherical aberration in the Hubble Space Telescope in 1993, the central masses of galaxies can be measured with a resolution 5 to 10 times better than can be achie…