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A Search for Ultraviolet Emission from LINERs
A. J. Barth, L. C. Ho, A. V. Filippenko +1
We have obtained Hubble Space Telescope WFPC2 2200 A and optical V-band images of 20 low-luminosity active galactic nuclei, most of which are spectroscopically classified as LINERs…
The Ultraviolet Spectra of LINERs: A Comparative Study
Dan Maoz, Anuradha Koratkar, Joseph C. Shields +3
Imaging studies have shown that about 25% of LINER galaxies display a compact nuclear UV source. As part of a program to study the nature of LINERs and their connection to the acti…
Relativistic Jets in Radio-Weak Quasars and LINER Galaxies
Heino Falcke, A. S. Wilson, L. C. Ho
We discuss radio observations of a sample of radio-weak and radio-intermediate quasars which demonstrate that - just like their radio-loud counterparts - radio-weak quasars too hav…
Sgr A* and Company - Multiwavelength observations of Sgr A* and VLA search of ``Sgr A*'s'' in LINERs
Heino Falcke, W. M. Goss, L. C. Ho +5
We report first results from a multiwavelength campaign to measure the simultaneous spectrum of Sgr A* from cm to mm wavelengths. The observations confirm that the previously detec…
A Search for "Dwarf" Seyfert Nuclei. V. Demographics of Nuclear Activity in Nearby Galaxies
Luis C. Ho, Alexei V. Filippenko, Wallace L. W. Sargent
We use the sample of emission-line nuclei derived from a recently completed optical spectroscopic survey of nearby galaxies to quantify the incidence of local (z = 0) nuclear activ…
A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
Luis C. Ho, Alexei V. Filippenko, Wallace L. W. Sargent
We have completed an optical spectroscopic survey of the nuclear regions (r < 200 pc) of a large sample of nearby galaxies. Although the main objectives of the survey are to search…
A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
Luis C. Ho, Alexei V. Filippenko, Wallace L. W. Sargent +1
We present the results of an optical spectroscopic survey designed to search for low-luminosity, "dwarf" Seyfert nuclei in a magnitude-limited sample of 486 bright, northern galaxi…